Dissertations / Theses: 'Einstieg'

1

Schlauri, Roman. "Verhalten von Pensionskassen beim Einstieg in erneuerbare Energie." St. Gallen, 2008. http://www.biblio.unisg.ch/org/biblio/edoc.nsf/wwwDisplayIdentifier/01653799002/$FILE/01653799002.pdf.

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Drewel, Marvin [Verfasser]. "Systematik zum Einstieg in die Plattformökonomie / Marvin Drewel." Paderborn : Universitätsbibliothek, 2021. http://d-nb.info/1237748364/34.

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3

Danspeckgruber, Wolfgang F. "Einstieg in den Ausstieg? Afghanistan als Verpflichtung des Westens." Universität Potsdam, 2011. http://opus.kobv.de/ubp/volltexte/2013/6324/.

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4

Melzer, Wolfgang, Axel Gehrmann, and Gesche Pospiech. "QUER - Qualifikationsprogramm für Akademiker zum Einstieg in den Lehrerberuf." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-167107.

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Zwischen 2012 und 2014 wurde an der TU Dresden das Qualifikationsprogramm für Akademiker zum Einstieg in den Lehrerberuf (QUER) konzipiert und erprobt. Personen mit abgeschlossenem fachwissenschaftlichem Studium studierten im Verlauf einer 18monatigen Weiterbildung die bildungswissenschaftlichen, fachdidaktischen und schulpraktischen Inhalte des Lehramtsstudiums in nahezu vollem Umfang, um anschließend den Vorbereitungsdienst an einer Grundschule, Oberschule oder einem Gymnasium im Freistaat Sachsen zu absolvieren. Der Abschlussbericht des ESF-geförderten Projektes informiert über: - den Aufbau des Programms - die Rekrutierung der Teilnehmendenrekrutierung - Ergebnisse der formativen und summativen Evaluation sowie - Befunde der wissenschaftlichen Begleitforschung zum Seiten- und Quereinstieg. Daraus resultierend werden Empfehlungen für die künftige Gestaltung von Quereinstiegsprogrammen für den Lehrerberuf formuliert.

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5

Höhle, Barbara. "Der Einstieg in die Grammatik : Spracherwerb während des ersten Lebensjahres." Universität Potsdam, 2005. http://opus.kobv.de/ubp/volltexte/2008/1627/.

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Die jüngere Forschung zum Spracherwerb hat gezeigt, dass sich schon in den ersten Äußerungen von Kindern bestimmte Strukturmerkmale der Sprache, die die Kinder lernen, zeigen, d.h., es gibt Bereiche, in denen im normalen Erwerb praktisch keine Fehler zu beobachten sind. Dies lässt den Schluss zu, dass die Kinder entsprechendes Wissen über die Zielsprache bereits erwerben, bevor sie entsprechende Äußerungen produzieren. Diese frühen Erwerbsschritte können in erster Linie über die Untersuchung der Sprachwahrnehmung untersucht werden. Solche Untersuchungen haben gezeigt, dass Kinder schon sehr früh gerade für prosodische Eigenschaften der Sprache sensitiv sind und dass sie diese Sensitivität unter anderem für die Erkennung von Wortgrenzen einsetzen. Die frühen Fähigkeiten zur Sprachwahrnehmung und -verarbeitung stehen offenbar in einem direkten Zusammenhang zur späteren lexikalischen und syntaktischen Entwicklung.

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6

Huhle, Sonja C. "Sexueller Missbrauch bei opiatabhängigen Frauen Einstieg, Verlauf und Überwindung der Abhängigkeit /." [S.l.] : [s.n.], 2000. http://www.sub.uni-hamburg.de/disse/571/huhle.pdf.

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7

Ginnold, Antje. "Der Übergang Schule - Beruf von Jugendlichen mit Lernbehinderung Einstieg - Ausstieg - Warteschleife." Bad Heilbrunn Klinkhardt, 2006. http://d-nb.info/987624733/04.

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8

Melzer, Wolfgang, Axel Gehrmann, and Gesche Pospiech. "QUER - Qualifikationsprogramm für Akademiker zum Einstieg in den Lehrerberuf: Abschlussbericht Dezember 2014." Technische Universität Dresden, 2014. https://tud.qucosa.de/id/qucosa%3A28694.

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Zwischen 2012 und 2014 wurde an der TU Dresden das Qualifikationsprogramm für Akademiker zum Einstieg in den Lehrerberuf (QUER) konzipiert und erprobt. Personen mit abgeschlossenem fachwissenschaftlichem Studium studierten im Verlauf einer 18monatigen Weiterbildung die bildungswissenschaftlichen, fachdidaktischen und schulpraktischen Inhalte des Lehramtsstudiums in nahezu vollem Umfang, um anschließend den Vorbereitungsdienst an einer Grundschule, Oberschule oder einem Gymnasium im Freistaat Sachsen zu absolvieren. Der Abschlussbericht des ESF-geförderten Projektes informiert über: - den Aufbau des Programms - die Rekrutierung der Teilnehmendenrekrutierung - Ergebnisse der formativen und summativen Evaluation sowie - Befunde der wissenschaftlichen Begleitforschung zum Seiten- und Quereinstieg. Daraus resultierend werden Empfehlungen für die künftige Gestaltung von Quereinstiegsprogrammen für den Lehrerberuf formuliert.

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9

Reich-Rohrwig, Florian. "Kapitalmarktorientierte Bewertung strategischer Optionen beim Einstieg in neue Märkte am Beispiel des UK Internet Brokerage /." [S.l.] : [s.n.], 2001. http://aleph.unisg.ch/hsgscan/hm00151482.pdf.

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10

Strölin, Ulrike. "Die Möglichkeiten des Mobile Commerce: wie können Verlage sie nutzen? Grundlagen für einen erfolgreichen Einstieg." Hamburg Diplomica-Verl, 2008. http://d-nb.info/1001548728/04.

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11

Zybatow, Lew. "Die sieben Siebe des EuroComRom für den multilingualen Einstieg in die Welt der slavischen Sprachen." Universität Leipzig, 1999. https://ul.qucosa.de/id/qucosa%3A33302.

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12

Brunnert, Rainer Harsch Günther Heimann Rebekka. "Organic chemistry goes bilingual - bilingualer Chemieunterricht : ein bilinguales Modul zum Einstieg in die organische Chemie nach dem PIN-Konzept /." Münster : Schüling, 2009. http://d-nb.info/993318797/04.

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13

Ebert, Maximilian [Verfasser], and Manfred [Akademischer Betreuer] Stahnke. "Musik-(An-)Ästhetik : Begriffsfindung und Einstieg zu ihrer Kategorisierung sowie zu ihrer theoretisch-analytischen Verortung und künstlerischen Auslotung / Maximilian Ebert ; Betreuer: Manfred Stahnke." Hamburg : Bibliothek der HfMT, 2020. http://d-nb.info/1215840462/34.

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14

Seidel, Ann-Kathrin Marie [Verfasser], Anya [Akademischer Betreuer] Pedersen, and Simone [Gutachter] Goebel. "Einstieg, Abstieg, Ausstieg – Empirische Zusammenhangsanalysen zur Vorhersage des Beginns und Verlaufs des Konsums von Cannabis / Ann-Kathrin Marie Seidel ; Gutachter: Simone Goebel ; Betreuer: Anya Pedersen." Kiel : Universitätsbibliothek Kiel, 2020. http://d-nb.info/1235399710/34.

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15

Seibert, David [Verfasser]. "Lehrer werden für das Fach Geschichte - im Labor! : Professionalisierung angehender Geschichtslehrer~innen durch Entwicklungsaufgaben in Lehr-Lern-Labor-Seminaren als Einstieg in eine theoriegeleitete Unterrichtspraxis. / David Seibert." Berlin : Freie Universität Berlin, 2020. http://d-nb.info/1212854349/34.

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16

Debie, Sven Oliver [Verfasser], Günter [Akademischer Betreuer] Kutscha, and Rolf [Akademischer Betreuer] Dobischat. "Belastungen beim Einstieg in das Berufsleben – Eine empirisch-quantitative Analyse von Problemen der Auszubildenden in der Eingangsphase der Berufsausbildung im Einzelhandel / Sven Oliver Debie. Gutachter: Rolf Dobischat. Betreuer: Günter Kutscha." Duisburg, 2013. http://d-nb.info/1037916425/34.

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17

Kaiser, Rudolf. "Drittmittel, Sponsoring und Fundraising - rechtskonforme Finanzierung öffentlicher Aufgaben oder Einstieg in die Korruption? ein Vergleich der rechtlichen Situation in der Schweiz und in Deutschland unter Berücksichtigung der unterschiedlichen Systeme der Hochschulfinanzierung." Zürich Basel Genf Schulthess, 2008. http://d-nb.info/990263746/04.

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18

Budke, Alexandra. "Einstiege." Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2013/6619/.

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19

Polo, Gomez Juan. "Tunneling dynamics of ultracold atoms." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/400375.

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La teoria que descriu la Mecànica Quàntica ens ha permès el descobriment de molts fenòmens que prèviament eren ocults dins la seva naturalesa probabilística. Concretament, la Mecànica Quàntica va permetre veure l'ara anomenada dualitat ona-partícula en objectes extremadament petits. Aquest comportament apareix típicament en sistemes aïllats i per tant, els experiments on les partícules no interactuen amb l'ambient son fonamentals per l'estudi de sistemes i fenòmens quàntics. Els àtoms ultrafreds són sistemes en els quals els àtoms són refredats a temperatures de l'ordre dels nanokelvin i, en general, continguts en cambres d'ultra buit, d'aquesta manera els àtoms es poden estudiar en ambients altament controlables. Dins d'aquest camp, els condensats de Bose—Einstein (CBE) són un estat de la matèria particularment interessant. En els CBE totes les partícules d'un gas ultrafred de bosons ocupen de manera macroscòpica un mateix estat quàntic. Aquest comportament fa que els CBE siguin ideals per estudiar fenòmens quàntics a escala macroscòpica. En aquesta tesis, investiguem sistemes on, un fenomen quàntic sense anàleg a la mecànica clàssica, l'efecte túnel, és, o té el potencial de ser, el mecanisme que inicia la dinàmica. Podem dir que una partícula massiva pateix efecte túnel, quan aquesta és capaç d'accedir a una regió clàssicament prohibida sense tenir l'energia cinètica necessària per fer-ho. Aquest fenomen pot aparèixer en diferents formes, per exemple, una partícula pot creuar per efecte túnel una barrera quan hi col·lisiona o pot simplement oscil·lar entre dos pous de potencial separats per una barrera. En aquest context, primer hem considerat la implementació d'un interferòmetre amb solitons de matèria brillants en el qual el mecanisme de divisió ve donat per la col·lisió amb una barrera d'amplada finita. Fem servir solitons de matèria brillants en CBE en una dimensió ja que aquests presenten propietats, com ara un comportament no dispersiu, que els fa ideals per interferometria. Com hem comentat abans, també estem interessats en sistemes on l'efecte túnel apareix entre potencials propers. En aquests casos, per tal d'estimar l'amplitud d'acoblament entre els auto-estats de les trampes locals, és necessari conèixer el perfil de densitat de manera analítica, especialment a les zones de baixa densitat. Particularment, estudiem els perfils de densitat en CBE de dues components atrapats en potencials harmònics els quals es troben en fase miscible. La formulació analítica d'aquests perfils de densitat per a cada component al voltant de les regions de baixa densitat ve donada per equacions universals. Seguidament, ens fixem en la dinàmica d'àtoms individuals en potencials acoblats a través de l'efecte túnel. Primer estudiem processos de passatge adiabàtic que representen una eina robusta i eficient pel transport i la càrrega d'àtoms entre potencials cilíndricament simètrics i concèntrics. Els dos processos que hem investigat estan basats en els anàlegs en matèria del passatge adiabàtic ràpid (RAP en anglès) i de la transferència adiabàtica Raman estimulada (STIRAP en anglès). Amb aquestes dues tècniques, som capaços de transportar l'àtom entre dos i tres anells i de carregar un àtom ultrafred des d’un potencial harmònic a un anell concèntric. Tot seguit, continuem estudiant anells, però aquest cop en comptes de fer servir una configuració concèntrica, fem servir potencials acoblats lateralment, on demostrem que amplituds d'acoblament complexes apareixen de manera natural en la dinàmica dels estats de moment angular de l'àtom. També proposem com fer servir aquesta propietat per dissenyar estats obscurs espacials a través de la interferència quàntica. Finalment, demostrem com aquests estats obscurs es poden fer servir per crear estats de vora en una banda òptica de trampes harmòniques, tant fent servir el conjunt d'estat fonamentals de les trampes com amb els estats que porten moment angular. Primerament, mostrem que aquests estats són robustos i que poden ser obtinguts en altres geometries. A més, també suggerim que fent servir el número quàntic associat al moment angular com a dimensió sintètica, s’obre la possibilitat de simular sistemes quàntics tridimensionals amb xarxes de dues dimensions.
The theory of Quantum Mechanics led to the discovery of many phenomena that were previously hidden by its probabilistic nature. In particular, Quantum Mechanics brought to light the so-called wave-particle duality behavior of extremely small objects. This behavior is typically obtained in isolated systems, therefore experiments where particles do not interact with the environment are basic to study quantum systems and quantum phenomena. Ultracold atoms are systems where atoms are cooled down to temperatures of the order of nanokelvin and, in general, kept in ultrahigh vacuum chambers, such that they can be studied in a highly controlled environment. Within this field, Bose—Einstein condensates (BECs) are a particular appealing state of matter where all the particles of an ultracold bose gas, macroscopically occupy a single quantum state. This behavior makes BECs ideal for studying quantum phenomena at a macroscopic scale. In this thesis, we investigate systems where, a quantum phenomenon that has no analogue in classical mechanics, the quantum tunneling is, or has the potential to be, the mechanism that triggers the dynamics. A tunneling event occurs whenever a massive particle is able to access a classically forbidden region of space without having the necessary kinetic energy to do it. Note that this phenomenon can arise in different scenarios, for instance a particle can tunnel when colliding with a potential barrier or it can simply oscillate between two separated wells separated by a potential barrier. In this context, first, we consider the implementation of a matter-wave bright soliton interferometer whose splitting mechanism is based on tunneling through a finite width barrier. We use bright matter-wave solitons in one dimensional BECs as they present properties, such as their dispersionless behavior, that are ideal for interferometric purposes. As mentioned previously, we are also interested on systems where tunneling occurs between neighboring potentials. For those cases, in order to estimate the tunneling amplitudes that couple the eigenstates of the local traps, the analytical density profiles of the eigenstates are required, especially around the low density regions. In particular, we study the density profiles of harmonically trapped two-component BECs within the miscible phase. The analytical formulation of the density profiles of each component around the low density regions is given by means of universal equations. We then turn our attention to the dynamics of single atoms in tunnel-coupled potentials. First, we study spatial adiabatic passage processes as a robust and efficient technique to transport and load single atoms between cylindrically symmetric concentric potentials. The two processes investigated are based on the matter-wave analogues of the rapid adiabatic passage and of the stimulated Raman adiabatic passage. With these techniques, we are able to transport the atom between two and three rings and to load an ultracold atom from a harmonic potential to a concentric ring. Next, we continue investigating ring potentials, but instead of using concentric rings, we use sided-coupled rings and we demonstrate that in this system, complex tunneling amplitudes appear naturally in the dynamics of single atom angular momentum states. We also propose to use this feature to engineer spatial dark states through quantum interference. Finally, we demonstrate how spatial dark states can be used to create edge-like states in an optical ribbon either for the manifold of ground states of the traps forming the ribbon or for states carrying orbital angular momentum. We show that these states are robust and that can be extended to other geometries. In addition, we suggest to use the winding number associated to the angular momentum as a synthetic dimension opening the possibility to quantum simulate three dimensional systems with two dimensional lattices.

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20

Akbaba, Esin. "Einstein Aether Gravity." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610898/index.pdf.

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In this thesis, we review some basic properties of the Einstein-aether gravity. We derive the field equations from an action and study a subclass of this theory corresponding to the Einstein-Maxwell like theory. We also show that the Gö
del type metrics are also exact solutions of this theory. Furthermore, we determine the observational constraints on the dimensionless preferred parameters of this theory using the parametrized post- Newtonian formalism. We stress that none of calculations and discussions are original in this thesis.

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21

Solomon, Adam. "Cosmology beyond Einstein." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708946.

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22

CARDOSO, Márcia do Socorro Borges de Araújo. "VARIEDADES QUASE EINSTEIN." Universidade Federal de Goiás, 2006. http://repositorio.bc.ufg.br/tede/handle/tde/1959.

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Made available in DSpace on 2014-07-29T16:02:21Z (GMT). No. of bitstreams: 1 Dissertacao Marcia do Socorro.pdf: 443270 bytes, checksum: f917bfac0b8dc2997dbb8fadfa28acce (MD5) Previous issue date: 2006-03-31
This dissertation is based about two works on quase Einstein manifolds. The first, published in 2000, by M. C. Chaki and R. K. Maity, on quase Einstein manifolds which are not conformally flat, and they determine sufficient condition so that the same ones are conformally flat. Already the second work, published by U. C. De and Gopal Chandre Ghosh, in 2004, establish a relation between the manifolds of amost constant curvature and the quasi Einstein manifolds, find necessary and sufficient conditions for a quasi Einstein manifolds to be of almost constant curvature, in follow prove an existence theorem on quase Einstein manifolds with other such manifolds like weak symmetries and semi-symmetries Ricci.
Esta dissertação está baseada em dois trabalhos sobre variedades quase Einstein. O primeiro, publicado em 2000, por M. C. Chaki e R. K Maity, sobre variedades quase Einstein que não são conformemente flat, e determinam condições suficientes para que as mesmas sejam conformemente conservativas. Já o segundo trabalho, publicado por U. C. De e Gopal Chandra Ghosh, em 2004, estabelece uma relação entre as variedades de curvatura quase constante e as variedades quase Einstein, encontra condições necessárias e suficientes para uma variedade quase Einstein ser de curvatura quase constante, em seguida prova um teorema de existência sobre variedades quase Einstein e relaciona o conceito de variedades quase Einstein com outras variedades tais como variedades fracamente simétricas e Ricci semi-simétrica.

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23

Karanasou, Vasiliki. "Thin-shell wormholes in Einstein Gravity and Einstein-Gauss-Bonnet Gravity." Thesis, Uppsala universitet, Teoretisk fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-421593.

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The aim of this project is the study of an alternative class of wormholes, the thin-shell wormholes. We investigate the construction , the existence and stability of thin-shell wormhole solutions made of negative tension branes in Einstein gravity and Einstein-Gauss-Bonnet gravity. We impose Z2 symmetry and we work for spherical, planar and hyperbolic symmetric spacetimes. In Einstein gravity, we show that we usually obtain stable solutions with a proper combination of an electric charge and a negative cosmological constant. In Einstein-Gauss-Bonnet gravity, we are interested in the solutions that admit the general relativistic limit. We also investigate how the extra term in the action, the Gauss-Bonnet term, affects the stability of these wormholes.

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24

Pedersen, H. "Geometry and magnetic monopoles : Constructions of Einstein metrics and Einstein-Weyl geometries." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353118.

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25

Fontcuberta, Famadas Laura. "La disputa Einstein-Bergson." Doctoral thesis, Universitat Autònoma de Barcelona, 2005. http://hdl.handle.net/10803/5165.

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Aquesta tesi pretén obrir un nou focus de discussió amb relació al problema entre els marges de la ciència i la filosofia. Hem centrat aquesta discussió, però, en el debat entre Einstein i Bergson sobre el temps. La nostra tesi parteix de la convicció que la definició de temps no s'entén si no ens aproximem a l'obra d'un autor des de la dimensió específicament discursiva, atès que creiem que, en filosofia, la constitució de sentit depèn d'un procés discursiu i que és possible aprehendre una part important dels suports lingüístics d'aquesta activitat especulativa. Volem, doncs, comprendre quines operacions lingüístiques fan que es desenvolupi l'escriptura bergsoniana. També pretenem provar que els detractors de Bergson no han entès el marc discursiu que el text proposava i que la seva perspectiva era la d'un altre camp ideològic, el de la ciència, amb un univers lingüístic propi. Bergson critica el concepte de temps de la ciència, que la relativitat completa i culmina, perquè es contraposa a la duració segons la qual l'autor ens demana que pensem. En la ciència, el temps és posat al nivell de l'espai com una quarta dimensió de l'espai. El mètode científic falseja, segons Bergson, el real perquè només s'interessa per allò que pot ser traduït en conceptes. Per això, el nostre treball mostra com la ciència avança gràcies als conceptes més que no pas a les teories. Des d'aquesta visió epistemològica, podrem entendre quina és la "metafísica implícita" d'aquests conceptes. Per exemplificar-ho, ens fixarem en el concepte de simultaneïtat i veurem com el mètode científic pressuposa una realitat divisible en moments estables i autònoms. La nostra conclusió és que la discussió entre Einstein i Bergson cal entendre-la com una discussió entre posicions ontològiques i epistemològiques divergents. Einstein deixa de fer ciència quan utilitza el llenguatge verbal i prescindeix dels símbols. Ara bé, des del moment en què Einstein s'endinsa en aquest nou àmbit, els conceptes científics perden tota la garantia que tenien en el terreny dels símbols científics. Aleshores, la discussió sobre el temps passa a ser una discussió filosòfica. Per tant, Bergson s'equivoca quan pretén fer dir a Einstein el que Einstein no diu i quan discuteix qüestions científiques. Einstein l'erra en no voler admetre que fa filosofia i que, per tant, la seva definició de temps ha adquirit una nova perspectiva.
This thesis tries to open a new focus of discussion around the limits of science and philosophy. But we have centred this problem in the controversy between Einstein and Bergson about time. Our thesis maintains that a study from a discursive dimension it's necessary if we want to understand this controversy. We think that the constitution of sense depends of a discursive process in philosophy. Also, we think that it's possible to apprehend an important part of the linguistics supports of this speculative activity. We want to understand the linguistics operations that permit the development of the bergsonian writing and we try to prove that the Bergson's detractors don't understand the discursive background proposed by the text. Their perspective is the perspective of another ideological ambit: the science's ambit, whit an own linguistic universe. Bergson criticizes the science's concept of time, the theory of relativity represents the culmination of this conception and it's opposed to the Bergson's duration. The science's time is placed at the same level that the space like a fourth dimension of space. The scientific method adulterates, according to Bergson, the reality because it is interested in something that can be expressed by concepts. That's why this thesis explains that the science progresses thanks to the concepts more than to the theories. From this epistemological perspective, we can understand the "implicit metaphysic" of these concepts. In order to illustrate our thesis, we pay on attention to the concept of simultaneity and to the scientific method that presupposes a reality divisible in stable and autonomous moments. The conclusion is that it's necessary to understand the controversy between Einstein and Bergson like a debate between ontological and epistemological postures completely divergents. Einstein leaves the scientific ambit when he uses the verbal language and dispenses with the symbols. Nevertheless, when he utilizes the verbal language, the scientific concepts lose the guaranty that they had in the ambit of scientific ambit. Then, the controversy about time becomes a philosophical controversy.

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26

Araujo, Fatima. "Einstein homogeneous Riemannian fibrations." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/4375.

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This thesis is dedicated to the study of the existence of homogeneous Einstein metrics on the total space of homogeneous fibrations such that the fibers are totally geodesic manifolds. We obtain the Ricci curvature of an invariant metric with totally geodesic fibers and some necessary conditions for the existence of Einstein metrics with totally geodesic fibers in terms of Casimir operators. Some particular cases are studied, for instance, for normal base or fiber, symmetric fiber, Einstein base or fiber, for which the Einstein equations are manageable. We investigate the existence of such Einstein metrics for invariant bisymmetric fibrations of maximal rank, i.e., when both the base and the fiber are symmetric spaces and the base is an isotropy irreducible space of maximal rank. We find this way new Einstein metrics. For such spaces we describe explicitly the isotropy representation in terms subsets of roots and compute the eigenvalues of the Casimir operators of the fiber along the horizontal direction. Results for compact simply connected 4-symmetric spaces of maximal rank follow from this. Also, new invariant Einstein metrics are found on Kowalski n-symmetric spaces.

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27

Kröncke, Klaus. "Stability of Einstein Manifolds." Phd thesis, Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2014/6963/.

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This thesis deals with Einstein metrics and the Ricci flow on compact mani- folds. We study the second variation of the Einstein-Hilbert functional on Ein- stein metrics. In the first part of the work, we find curvature conditions which ensure the stability of Einstein manifolds with respect to the Einstein-Hilbert functional, i.e. that the second variation of the Einstein-Hilbert functional at the metric is nonpositive in the direction of transverse-traceless tensors. The second part of the work is devoted to the study of the Ricci flow and how its behaviour close to Einstein metrics is influenced by the variational be- haviour of the Einstein-Hilbert functional. We find conditions which imply that Einstein metrics are dynamically stable or unstable with respect to the Ricci flow and we express these conditions in terms of stability properties of the metric with respect to the Einstein-Hilbert functional and properties of the Laplacian spectrum.
Die vorliegende Arbeit beschäftigt sich mit Einsteinmetriken und Ricci-Fluss auf kompakten Mannigfaltigkeiten. Wir studieren die zweite Variation des Einstein- Hilbert Funktionals auf Einsteinmetriken. Im ersten Teil der Arbeit finden wir Krümmungsbedingungen, die die Stabilität von Einsteinmannigfaltigkeiten bezüglich des Einstein-Hilbert Funktionals sicherstellen, d.h. die zweite Varia- tion des Einstein-Hilbert Funktionals ist nichtpositiv in Richtung transversaler spurfreier Tensoren. Der zweite Teil der Arbeit widmet sich dem Studium des Ricci-Flusses und wie dessen Verhalten in der Nähe von Einsteinmetriken durch das Variationsver- halten des Einstein-Hilbert Funktionals beeinflusst wird. Wir finden Bedinun- gen, die dynamische Stabilität oder Instabilität von Einsteinmetriken bezüglich des Ricci-Flusses implizieren und wir drücken diese Bedingungen in Termen der Stabilität der Metrik bezüglich des Einstein-Hilbert Funktionals und Eigen- schaften des Spektrums des Laplaceoperators aus.

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Hellweg, Dirk. "Phasenfluktuationen in Bose-Einstein-Kondensaten." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969730411.

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Schmaljohann, Holger. "Spindynamik in Bose-Einstein-Kondensaten." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972010866.

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Fjällborg, Mikael. "On the Einstein-Vlasov system." Doctoral thesis, Karlstad University, Faculty of Technology and Science, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-742.

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In this thesis we consider the Einstein-Vlasov system, which models a system of particles within the framework of general relativity, and where collisions between the particles are assumed to be sufficiently rare to be neglected. Here the particles are stars, galaxies or even clusters of galaxies, which interact by the gravitational field generated collectively by the particles.

The thesis consists of three papers, and the first two are devoted to cylindrically symmetric spacetimes and the third treats the spherically symmetric case.

In the first paper the time-dependent Einstein-Vlasov system with cylindrical symmetry is considered. We prove global existence in the so called polarized case under the assumption that the particles never reach a neighborhood of the axis of symmetry. In the more general case of a non-polarized metric we need the additional assumption that the derivatives of certain metric components are bounded in a vicinity of the axis of symmetry to obtain global existence.

The second paper of the thesis considers static cylindrical spacetimes. In this case we prove global existence in space and also that the solutions have finite extension in two of the three spatial dimensions. It then follows that it is possible to extend the spacetime by gluing it with a Levi-Civita spacetime, i.e. the most general vacuum solution of the static cylindrically symmetric Einstein equations.

In the third and last paper, which is a joint work with C. Uggla and M. Heinzle, the static spherically symmetric Einstein-Vlasov system is studied. We introduce a new method by rewriting the system as an autonomous dynamical system on a state space with compact closure. In this way we are able to improve earlier results and enlarge the class of distribution functions which give rise to steady states with finite mass and finite extension.

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Benson, Eric. "Bose-Einstein condensation of excitons." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0017/NQ48088.pdf.

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Tieu, Steven. "The stationary Einstein-Maxwell equations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ61610.pdf.

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Arlt, Jan. "Experiments on Bose-Einstein condensation." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326008.

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Davis, Matthew John. "Dynamics of Bose-Einstein condensation." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393350.

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Henkel, Nils. "Rydberg-dressed Bose-Einstein condensates." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-130499.

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My dissertation treats the physics of ultracold gases, in particular of Bose-Einstein condensates with long-ranged interactions induced by admixing a small fraction of a Rydberg state to the atomic ground state. The resulting interaction leads to the emergence of supersolid states and to the self-trapping of a Bose-Einstein condensate.

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Schopka, Sven [Verfasser]. "Noncommutative Einstein Manifolds / Sven Schopka." Aachen : Shaker, 2007. http://d-nb.info/1166510778/34.

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Marelic, Jakov. "Bose-Einstein condensation of photons." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/59351.

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A Bose-Einstein condensate can be made of photons. The photons are held at thermodynamic equilibrium in a dye-filled microcavity and pumped with a laser. Thermalisation can be demonstrated and above the threshold a Bose-Einstein condensate will form. A Mach-Zehnder interferometer is built and used to measure the spatial and temporal first-order coherence under various conditions. We build a momentum-resolved spectrometer and use it to obtain views into the phase-space distribution of the photon condensate. We put an upper bound on the value of the interaction strength parameter and find that the microcavity system is ergodic even when not at thermal equilibrium. We build a setup to stabilise the pump laser power with the aim to observe the λ-point of the condensate.

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Saa, Alberto Vazquez. "Gravitação de einstein-cartan revisitada." Universidade de São Paulo, 1994. http://www.teses.usp.br/teses/disponiveis/43/43132/tde-13122013-144806/.

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O papel da torção do espaço-tempo na Relatividade Geral é revisto nesta tese. Estudando-se formas diferenciais de volume em variedades afins, será mostrado que o elemento de volume riemanniano usual não é compatível com conexões com torção. Um novo elemento de volume é proposto e usado na formulação lagrangiana da gravitação de Einstein-Cartan. O modelo que surge prevê, entre outras coisas, a propagação da torção e a interação entre campos de gauge e a torção do espaço-tempo sem a perda da simetria de gauge. O novo elemento de volume também permite uma interpretação geométrica, em termos das quantidades não-riemannianas do espaço-tempo, para as correções à gravitação advindas da teoria de cordas (dilaton gravity).
The role of space-time torsion in General Relativity is reviewed in this thesis. Through the analysis of volume forms in affine manifolds, it will be shown that the usual riemannian volume element is no! compatible with connections with non-vanishing torsion. A new volume element is proposed and used in the lagrangian formulation for Einstein-Cartan theory of gravity. By this new model, torsion can propagate and gauge fields can interact with torsion without breaking of gauge invariance. The new volume element can also provide a geometrical interpretation for the dilaton gravity by means of the non-riemannian quantities of space-time.

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Guenancia, Henri. "Métriques de Kähler-Einstein singulières." Paris 6, 2013. http://www.theses.fr/2013PA066523.

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Dans cette thèse, la notion centrale est celle de métrique de Kähler-Einstein. \`A la suite des travaux fondateurs de Aubin et Yau (entre autres) résolvant le problème de l'existence de métrique kähleriennes à courbure de Ricci constante négative ou nulle, les mathématiciens se sont intéressés à diverses généralisations possibles de ces résultats. Nous en présenterons deux aspects ainsi qu'une application en géométrie algébrique. Tout d'abord, nous montrerons l'existence de métriques de Kähler-Einstein à singularités prescrites (de type coniques, ou Poincaré) le long d'un diviseur à croisement normaux. Ensuite, nous construirons des métriques de Kähler-Einstein sur des variétés singulières, à singularités semi-log canoniques (travail en commun avec Robert Berman); nous analyserons également les singularités de ces métriques associées à des paires Kawamata log terminales (klt) sur le lieu log-lisse, ce qui fera un lien avec la première partie. Enfin, nous mentionnerons une application de ces techniques à la semi-stabilité ou semipositivité générique du faisceau tangent de variétés à singularités log canoniques
In this thesis, the notion of Kähler-Einstein metric is central. After the pioneering works of Aubin and Yau (among others) who proved the existence of Kähler metrics with negative or zero Ricci curvature, mathematicians started to focus on various generalizations of these results. We will present two such aspects and an application in algebraic geometry. First, we will show the existence of Kähler-Einstein metrics with prescribed singularities (of cone or Poincaré type) along a simple normal crossing divisor. Then, we will construct Kähler-Einstein metrics on singular varieties and more precisely with semi-log canonical singularities (joint work with Robert Berman); we will further analyze the singularities of those metrics attached to Kawamata log terminal (klt) pairs on the log-smooth locus, which will make a connection with the first part. Finally, we will mention an application of those techniques to the semi-stability or generic semipositivity of the tangent sheaf of varieties with log canonical singularities

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Söhn, Matthias. "Solitons in Bose-Einstein Condensates." [S.l. : s.n.], 2002. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10047894.

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Roth, John Charles. "Perturbations of Kähler-Einstein metrics /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/5737.

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Carr, Lincoln D. "Solitons in Bose-Einstein condensates /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/9702.

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Lewoczko-Adamczyk, Wojciech. "Bose-Einstein condensation in microgravity." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2009. http://dx.doi.org/10.18452/15970.

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Ultra-kalte atomare Gase werden in zahlreichen Laboren weltweit untersucht und finden unter anderem Anwendung in Atomuhren und in Atominterferometer. Die Einsatzgebiete erstrecken sich von der Geodäsie über die Metrologie bis hin zu wichtigen Fragestellungen der Fundamentalphysik, wie z.B. Tests des Äquivalenzprinzips. Doch die beispiellose Messgenauigkeit ist durch die irdische Gravitation eingeschränkt. Zum einen verzerrt die Schwerkraft das Fallenpotential und macht damit die Reduktion der atomaren Energie unter einem bestimmten Limit unmöglich. Zum anderen werden die aus einer Falle frei gelassenen Teilchen durch die Erdanziehung beschleunigt und so ist deren Beobachtungszeit begrenzt. Im Rahmen dieser Arbeit werden die Ergebnisse des Projektes QUANTUS (Quantengase Unter Schwerelosigkeit) dargestellt. Auf dem Weg zur Implementierung eines Quantengasexperimentes im Weltraum wurde innerhalb einer deutschlandweiten Zusammenarbeit eine kompakte, portable und mechanisch stabile Apparatur zur Erzeugung und Untersuchung eines Bose-Einstein-Kondensats (BEC) unter Schwerelosigkeit im Fallturm Bremen entwickelt. Sowohl die Abbremsbeschleunigung von bis zu 50 g als auch das begrenzte Volumen der Fallkapsel stellen hohe Ansprüche an die mechanische Stabilität und die Miniaturisierung von optischen und elektronischen Komponenten. Der Aufbau besteht aus einer im ultra-hoch Vakuum geschlossenen magnetischen Mikrofalle (Atomchip) und einem kompakten auf DFB-Dioden basierenden Lasersystem. Mit diesem Aufbau ließ sich das erste BEC unter Schwerelosigkeit realisieren und nach 1 Sekunde freier Expansion zu beobachten. Weder die schwache Krümmung des Fallenpotentials noch die lange Beobachtungszeit würden in einem erdgebundenen Experiment realisierbar. Die erfolgreiche Umsetzung des Projektes eröffnet ein innovatives Forschungsgebiet - degenerierte Quantengase bei ultratiefen Temperaturen im pK-Bereich, mit großen freien Evolutions- und Beobachtungszeiten von mehreren Sekunden.
Recently, cooling, trapping and manipulation of neutral atoms and ions has become an especially active field of quantum physics. The main motivation for the cooling is to reduce motional effects in high precision measurements including spectroscopy, atomic clocks and matter interferometry. The spectrum of applications of these quantum devices cover a broad area from geodesy, through metrology up to addressing the fundamental questions in physics, as for instance testing the Einstein’s equivalence principle. However, the unprecedented precision of the quantum sensors is limited in terrestial laboratories. Freezing atomic motion can be nowadays put to the limit at which gravity becomes a major perturbation in a system. Gravity can significantly affect and disturb the trapping potential. This limits the use of ultra-shallow traps for low energetic particles. Moreover, free particles are accelerated by gravitational force, which substantially limits the observation time. Targeting the long-term goal of studying cold quantum gases on a space platform, we currently focus on the implementation of a Bose-Einstein condensate (BEC) experiment under microgravity conditions at the drop tower in Bremen. Special challenges in the construction of the experimental setup are posed by a low volume of the drop capsule as well as critical decelerations up to 50g during recapture at the bottom of the tower. All mechanical and electronic components were thus been designed with stringent demands on miniaturization and mechanical stability. This work reports on the observation of a BEC released from an ultra-shallow magnetic potential and freely expanding for one second. Both, the low trapping frequency and long expansion time are not achievable in any earthbound laboratory. This unprecedented time of free evolution leads to new possibilities for the study of BEC-coherence. It can also be applied to enhance the sensitivity of inertial quantum sensors based on ultra-cold matter waves.

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44

Wu, Biao. "Bose-Einstein condensation of dilute atomic gases." Access restricted to users with UT Austin EID, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3037026.

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45

Chefu, Joseph. "Albert Einstein - ein Missverständnis : der Glaube in der Physik-Theorie ; eine neue Sicht der Leistungen des Physik-Nobelpreisträgers / Joseph Chefu." Göttingen Cuvillier, 2008. http://d-nb.info/987758764/04.

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Krämer, Thomas. "Carl Einsteins "Bebuquin" : Romantheorie und Textkonstitution /." Würzburg : Königshausen und Neumann, 1991. http://catalogue.bnf.fr/ark:/12148/cb355110669.

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Neundorfer, German. ""Kritik an Anschauung" : Bildbeschreibung im kunstkritischen Werk Carl Einsteins /." Würzburg : Königshausen & Neumann, 2003. http://catalogue.bnf.fr/ark:/12148/cb39026204d.

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48

Cofler, Enrico. "Teoria del condensato di Bose-Einstein." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14515/.

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Questo lavoro ripercorre gli aspetti principali della teoria del condensato di Bose-Einstein, utilizzando nozioni di fisica statistica, meccanica quantistica non relativistica e idrodinamica. Nella prima parte si ricava dalla statistica di Bose il fenomeno della condensazione, ovvero una transizione nel sistema che porta a un’occupazione macroscopica del livello energetico. Si discutono anche alcuni fenomeni fisici caratteristici che emergono da una prima osservazione del condensato in una trappola con potenziale armonico anisotropo. Dopo aver introdotto gli urti tra i bosoni, si calcola, mediante la teoria di campo medio, l’equazione di Gross-Pitaevskii, soddisfatta dalla funzione d’onda del condensato. Sfruttando il calcolo variazionale, è possibile inoltre valutare l’importanza del termine energetico di interazione e dell’energia cinetica, e introdurre opportune approssimazioni alla funzione d’onda a seconda delle condizioni fisiche in cui si realizza il condensato. Nell’ultimo capitolo si considera la dinamica del condensato generalizzando l’equazione di Gross-Pitaevskii al caso dipendente dal tempo. In particolare, sfruttando alcune nozioni della teoria di Bogoliubov, si mettono in luce le connessioni tra la teoria dello stato condensato e il fenomeno della superfluidità.

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Fariña, Sierra Noela. "Cosmological Perturbations in Einstein-Aether Theories." Doctoral thesis, Universitat de Barcelona, 2011. http://hdl.handle.net/10803/111045.

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In this thesis we study the Einstein-Aether (E-A) theory from the point of view of its cosmological perturbations. We are interested in the constraints that may be obtained from this analysis and the special features that can arise from the vector mode, absent in General Relativity. We apply the theory of linear perturbations in an expanding universe to describe the growth of inhomogeneities on subhorizon scales after recombination. We can split the perturbations in the different modes (scalar, vector and tensor) and we can study each of them separately. This allow us to obtain the stability conditions for this kind of theories and we can also obtain the power spectrum for each mode. For the scalar modes, we calculate the subhorizon solutions during the radiation and matter domination epochs. We are also interested in the effect of the theory in the Cosmic Microwave Background anisotropies, in particular in the contribution of the vector modes, as these modes are absent in General Relativity. We analyze the solutions for radiation and matter and calculate the angular power spectrum at large and small angular scales. This allows us to compare the contribution of the vector modes with the one coming from the tensor ones and with observations. The last issue we address is the effects of the vector modes in the polarization of the Cosmic Microwave Background.
L’objectiu d’aquesta tesi és estudiar la teoria d’Einstein-Aether des del punt de vista de les pertorbacions cosmològiques. Estem interessats en les restriccions pels paràmetres de la teoria que es poden obtenir d’aquesta anàlisi i en les característiques particulars que pot generar el mode vectorial, absent en Relativitat General. Podem fer servir la teoria de pertorbacions lineals en un univers en expansió per descriure el creixement de les inhomogeneïtats a escales subhoritzó després de recombinació. Separem les pertorbacions en els diferents modes escalar, vectorial i tensorial i estudiem cada un d’ells separadament. Això ens permetrà obtenir les condicions d'estabilitat d'aquestes teories així com l’espectre de potències per cada un d'aquests modes. En el cas de l’escalar, calculem les solucions de subhoritzó durant les èpoques de radiació i matèria També estem interessats en l'efecte de la teoria d’Einstein-Aether en les anisotropies del fons còsmic de microones, en particular en la contribució dels modes vectorials, inexistent pel cas de Relativitat General. Analitzem les solucions per a radiació i matèria i calculem l’espectre de potències angular tant a escales angulars petites com a escales angulars grans. Comparem els resultats amb la contribució procedent del mode tensorial i amb les observacions. L'última qüestió que abordem és l'efecte que el mode vectorial té en la polarització del fons còsmic de radiació.

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Micaletti, Pietro. "Vorticosità nei condensati di Bose-Einstein." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21194/.

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La presente trattazione prende in esame i condensati di Bose-Einstein (BEC) e la formazione di vortici in tali strutture. Per analizzare questi aspetti si fa ricorso sia alla descrizione fisica, ripercorrendo il lavoro di Boltzmann, di Bose e di Einstein, sia al formalismo matematico tipico della topologia algebrica. Inoltre viene analizzato il fenomeno della superfluidità, segnatamente nel caso di He liquido, e vengono messe in evidenza analogie e diversità con la condensazione di Bose-Einstein. La transizione BKT rappresenta un punto imprescindibile per la comprensione del meccanismo alla base della formazione dei vortici. Infine ci si sofferma sugli aspetti sperimentali sottesi alla realizzazione dei BEC e alla produzione dei vortici in questi ultimi, vale a dire trappole magnetiche e raffreddamento laser per quanto riguarda i primi ed effetto Stark per quanto concerne i secondi.

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Dissertations / Theses on the topic 'Einstieg'

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