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Dissertations / Theses on the topic 'Cosmology'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Pocino, Yuste Andrea. "Cosmology with photometric redshift." Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/671733.

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Els cartografiats de galàxies fotomètrics actuals i futurs observaran un gran volum de l’univers que ens permetrà acotar amb precisió el model cosmològic. Tanmateix, la capacitat de delimitar el model que tenen aquests cartografiats a través de les sondes cosmològiques depèn de la precisió i certesa amb les que es determina el redshift de les galàxies. Per tant, la determinació del redshift fotomètric i els seus efectes en les anàlisis cosmològiques han de ser tractats i estudiats curosament. En la primera part de la tesi, transformem la fotometria de simulacions que ja existeixen per imitar

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2

Manera, Miret Marc. "Cosmologia i Formació d'Estructures / Cosmology and Structures Formation." Doctoral thesis, Universitat de Barcelona, 2007. http://hdl.handle.net/10803/1790.

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In this thesis we push forward techniques to learn about the large scale structure formation of the universe. The approach is from theory, observations and simulations. From theory we study the growth of four non standard cosmological models: DGP model, Cardassian model, Chaplygin gas model and Coupled Quintessence model. From observations we look at the ISW effect by means of the cross-correlation between CMB maps and galaxy survey. From a compilation of data we contrain the cosmological parameters and give new evidence of dark energy. We also introduce a new method to compute errors in conf

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3

Gatti, Marco. "Weak lensing in DES Y3: redshift distributions, shape catalogue, and mass mapping." Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/670527.

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En aquesta tesi hem tractat alguns aspectes clau de les lents dèbils gravitacionals en el context d’enquestes fotomètriques. En particular, es van utilitzar simulacions i dades preses durant els primers tres anys d’observacions de l’enquesta de l’energia fosca (DES Y3). Les programacions de DES estan publicades a finals d’aquest any amb les principals anàlisis cosmològiques de DES Y3 i aquesta tesi abasta algunes de les anàlisis. A la part II d’aquesta tesi, ens hem centrat en la tècnica de “clustering-redshift” i el seu part en la principal estratègia de calibració de redshift DES Y3. Cluster

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4

Hasselfield, Matthew. "Galaxy cluster cosmology with the Atacama Cosmology Telescope." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45602.

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Observations of the Cosmic Microwave Background (CMB) are crucial components of our understanding of cosmology. Modern high resolution, ground-based CMB survey instruments provide important information about the mass and energy content of our present Universe and the high-energy physics of the Big Bang. In this work we present several aspects of our work on the Atacama Cosmology Telescope (ACT), a 6m telescope in Northern Chile that observed the CMB in three millimetre wavelength bands from 2007–2010. We begin with a description of the Multi-Channel Electronics readout system, an important

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5

Leta, Carlos Pereira. "Formação de estruturas em cosmologia no regime não-linear: uma aproximação por sistemas dinâmicos." Universidade do Estado do Rio de Janeiro, 2006. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=560.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Formação de estruturas em larga escala é um problema em aberto em Cosmologia. Há um consenso de que a variedade de estruturas observadas tais como galáxias e aglomerados de galáxias tiveram origem a partir de pequenas flutuações do fluido cósmico possivelmente geradas durante a época inflacionária na era dominada pela matéria. Os estágios iniciais da evolução destas flutuações são descritas pela teoria de Jeans resultante da aproximação linear das equações hidrodinâmicas. Basicamente, a instabilidade devido à ação do campo gravi

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6

Bonilla, Tobar Maria del Pilar. "Reaquecimento em um modelo de inflação quintessencial /." São Paulo, 2009. http://hdl.handle.net/11449/132544.

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Orientador: Rogério Rosenfeld<br>Banca: Bruto Max Pimentel Escobar<br>Banca: Rudnei de Oliveira Ramos<br>Resumo: O modelo cosmológico inflacionário postula uma rápida expansão do universo primordial, denominada inflação, que pode resolver certas diflculdades da cosmologia padrão. Em modelos inflacionários mais simples a expansão acelerada é causada pela densidade de energia armazenada em um campo escalar denominado inflaton. Após a fase inflacionária, o universo encontra-se em um estado frio e sem partículas. Deve haver um mecanismo responsável pelo reaquecimento do universo. Nesta dissertação

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7

Knebe, Alexander. "Computational cosmology." Thesis, Universität Potsdam, 2008. http://opus.kobv.de/ubp/volltexte/2010/4114/.

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“Computational Cosmology” is the modeling of structure formation in the Universe by means of numerical simulations. These simulations can be considered as the only “experiment” to verify theories of the origin and evolution of the Universe. Over the last 30 years great progress has been made in the development of computer codes that model the evolution of dark matter (as well as gas physics) on cosmic scales and new research discipline has established itself. After a brief summary of cosmology we will introduce the concepts behind such simulations. We further present a novel computer code for

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8

Narimani, Ali. "Dimensionless cosmology." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/37365.

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The variability of fundamental physical constants has been a topic of interest both theoretically and experimentally for many years. Although it is interesting to investigate the consequences of such a variation, it is important to realise that only the variation of dimensionless combination of constants can be meaningfully measured and discussed. In this thesis, I try to justify this way of thinking and apply it to two basic cosmological observables, Big Bang Nucleosynthesis and Cosmic Microwave Background anisotropies. I will mention some related studies that are either wrong or not complete

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9

Whiting, Alan B. "Local cosmology." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360010.

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10

Simon-Petit, Alicia. "Systèmes Dynamiques Gravitationnels." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLY021/document.

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L'histoire séculaire des systèmes dynamiques puise ses originesdansle développement du cadre mathématique en astronomie.L'objet de cette thèse est l'étude de propriétés de la gravitation de ce point de vue de la dynamiqueà différentes échelles cosmologiques.Dans la théorie du potentiel, l'isochronie définit généralement le mouvement d'oscillation harmonique de pendules.En 1959, le mathématicien et astronome Michel Hénon étend cette définition afin de caractériser les oscillationsorbitales d'étoiles, autour du centre du système à symétrie sphérique auquel elles appartiennent.Dans ce cas, la pér

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11

Boriero, Daniel Francisco 1981. "Fenomenologia de neutrinos massivos em cosmologia." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278586.

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Orientador: Pedro Cunha de Holanda<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-22T08:38:27Z (GMT). No. of bitstreams: 1 Boriero_DanielFrancisco_D.pdf: 1994859 bytes, checksum: a59e512b9fdcb71d04bb5f9702f0fb60 (MD5) Previous issue date: 2013<br>Resumo: Cosmologia de neutrinos é a atividade de pesquisa dedicada ao teste de propriedades de neutrinos através de observáveis cosmológicos. Particularmente, as propriedades estudadas e testadas ao longo desta tese de doutorado foram à massa dos neutrinos e o número

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12

Vikman, Alexander. "K-essence: cosmology." Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-77612.

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13

Seery, David. "Quantum brane cosmology." Thesis, University of Edinburgh, 2005. http://hdl.handle.net/1842/27362.

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The cosmological phenomenology of branes is tested, concentrating on quantum mechanical models at all levels. In increasing order of energy, we discuss low-energy observable quantum fields on the brane, higher-energy quantum fields which live in the new bulk space provided by brane scenarios, quantum mechanical models of the brane world itself, and simple phenomenological models of quantum mechanical strings. We calculate radiative gravitational corrections to the mass of a class of light scalar fields, which include the inflation and the quintessence field, and discuss constrains which arise

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14

Pederson, Steven Patrick. "Flawed nature cosmology." University of Southern Queensland, Faculty of Sciences, 2008. http://eprints.usq.edu.au/archive/00004433/.

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[Abstract]: This thesis presents a new cosmological model based on a blank-slate reconsideration of the issue of the first cause in cosmology. It is proposed that a pre-Big Bang evolution of nature occurred that removes the need for postulating the existence of matter, energy and time. This new approach leads to an underlyingconceptualisation of nature consistent with quantum mechanics.The problems of first cause and initial conditions in cosmology are reconsidered. It is proposed that the initial conditions were flawed and evolved toproduce the Big Bang as a natural response to these flaws.

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15

Lashkari, Nima. "Hagedorn transition cosmology." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32511.

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The substantial recent advances in early universe observational cosmology have confronted theoretical physics with a number of deep conceptual questions. The standard model of particle physics and its natural extensions have proven to be insufficient for explaining the recent observations. String theory as the main candidate for a complete theory of quantum gravity provides us with the possibility of resolving this discrepancy. In this dissertation, I begin by an overview of thermodynamics in string theor

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16

Firouzjahi, Hassan. "Brane world cosmology." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82871.

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Recently, the ideas of extra dimensions and brane world scenarios have captured considerable interest. The potential ability of these brane-based models to explain the gauge hierarchy problem and the cosmological constant problem has been examined in numerous recent papers (on these subjects). In the first part of this thesis we examine many aspects of warped brane world scenarios, focusing on the Randall-Sundrum model. We begin with the stability issue of the Randall-Sundrum model and its cosmological implications. We will specifically verify that the Randall-Sundrum scenario; once sta

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17

Hughes, David Ian. "Supersymmetric quantum cosmology." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358637.

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18

Bocquet, Sebastian. "Galaxy cluster cosmology." Diss., Ludwig-Maximilians-Universität München, 2015. http://nbn-resolving.de/urn:nbn:de:bvb:19-183812.

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19

Lee, Seung Joo. "Braneworld inspired cosmology." Thesis, University of Sussex, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426257.

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20

Wong, D. "Cosmology and superstrings." Thesis, University of Sussex, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381634.

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21

Mitchell, D. G. "Strings in cosmology." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47184.

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22

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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23

Kraljic, David. "Inhomogeneities in cosmology." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:e7786a47-13c6-4b4b-b1c6-0fb0cd838e9c.

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The standard ΛCDM cosmological model has been successful in accommodating most of the cosmological observations to date. However, there are still many theoretical and observational issues that this model needs to address before it can constitute a reliable framework in this era of 'precision cosmology'. In this thesis, we focus on some of these issues and shortcomings of the ΛCDM model that stem from inhomogeneities in the universe. We begin by focusing on the generation of inhomogeneities by suggesting a generic approach to building suitable models for the origin of structure wi

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24

Bree, William Dennis. "An Earthly Cosmology." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/35728.

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The following thesis project explores the design of a nature center and planetarium within Rock Creek Park, in Washington, DC. The project evolved from a desire to re-imagine a relationship with nature in a way that allows conversation, reflective thinking, and allows oneâ s sense of wonder to enter a place which is between science and myth. The design of the nature center and planetarium was developed by investigating the dualities which exist within and around the site, such as earth and air, day and night,and winter and summer. The goal was to create a building which is fully embedded in t

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25

Hobbs, Claudia Stacey. "Topics in cosmology." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/4889.

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Bibliography: leaves 147-153.<br>This thesis contains two distinct parts: the first part introduces and explains the relevant theory and background necessary for the analytic work done on magnetized cosmological perturbations at the end of the first part. The second part discusses some issues related to observational cosmology. After an introductory chapter including an overview of the thesis, PART I starts with a discussion of the covariant approach to cosmology, introducing notation needed in the thesis. The covariant approach to perturbations is then discussed, and the basic inhomogeneity v

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26

Koyama, Kazuya. "Brane World Cosmology." Kyoto University, 2002. http://hdl.handle.net/2433/149872.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(人間・環境学)<br>甲第9664号<br>人博第148号<br>13||133(吉田南総合図書館)<br>新制||人||35(附属図書館)<br>UT51-2002-G422<br>京都大学大学院人間・環境学研究科人間・環境学専攻<br>(主査)教授松田哲, 助教授阪上雅昭, 助教授早田次郎<br>学位規則第4条第1項該当

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27

Baum, Lauris M. Frampton Paul H. "A cyclic cosmology." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2009. http://dc.lib.unc.edu/u?/etd,2375.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2009.<br>Title from electronic title page (viewed Jun. 26, 2009). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Physics and Astronomy." Discipline: Physics and Astronomy; Department/School: Physics and Astronomy.

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28

Chen, Gang. "Topics in Cosmology /." Search for this dissertation online, 2004. http://wwwlib.umi.com/cr/ksu/main.

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29

Kanno, Sugumi. "Towards string cosmology." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/144168.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(理学)<br>甲第12085号<br>理博第2979号<br>新制||理||1444(附属図書館)<br>23921<br>UT51-2006-J80<br>京都大学大学院理学研究科物理学・宇宙物理学専攻<br>(主査)助教授早田次郎, 教授中村卓史, 教授畑浩之<br>学位規則第4条第1項該当

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30

Moncayo, Vanúbia Araújo Laulate. "A sustainability cosmology." reponame:Repositório Institucional da UFSC, 2014. https://repositorio.ufsc.br/xmlui/handle/123456789/132408.

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Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão, Programa de Pós-Graduação em Inglês: Estudos Linguísticos e Literários, Florianópolis, 2014.<br>Made available in DSpace on 2015-04-29T21:01:24Z (GMT). No. of bitstreams: 1 333149.pdf: 3021682 bytes, checksum: 1faab343945a84f406f5a4dff729896a (MD5) Previous issue date: 2014<br>Abstract : Based on cosmologies and constellations within Legitimation Code Theory (LCT) interfaced with appraisal framework within Systemic Functional Linguistics (SFL), this research aims at analyzing sustainability knowledg

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31

Alberghi, Gian Luigi <1971&gt. "High energy cosmology." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/630/1/Tesi_Alberghi_Gian_Luigi.pdf.

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32

Alberghi, Gian Luigi <1971&gt. "High energy cosmology." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/630/.

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33

Holanda, Rodrigo Fernandes Lira de. "Análogos clássicos para cosmologias relativísticas aceleradas: uma abordagem lagrangiana." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/14/14131/tde-19022008-172443/.

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Nesta dissertação, uma revisão dos modelos cosmológicos newtonianos e neo-newtonianos baseados na formulação da hidrodinâmica clássica é apresentada, com especial ênfase para os resultados básicos e as limitações mais importantes dessas abordagens. Em seguida, mostramos que a descrição Lagrangiana clássica proposta por Lima, Moreira e Santos (1998) para fluidos simples, pode ser generalizada para incluir modelos com misturas de fluidos, e portanto, cosmologias mais realísticas contendo bárions, matéria escura e energia escura, bem como qualquer forma de interação entre essas componentes. N

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34

Durrive, Jean-Baptiste. "Baryonic processes in the large scale structuring of the Universe." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS346/document.

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Ma thèse porte sur deux questions importantes de la Cosmologie:(i) L'origine des champs magnétiques cosmologiques:L'Univers semble magnétisé à absolument toutes ses échelles (spatiales et temporelles), y compris le milieu intergalactique. Mais leur origine est encore inconnue à l'heure actuelle, malgré les nombreux efforts pour essayer de répondre à cette question. On pense qu'ils ont d'abord été générés avec de très faibles amplitudes, puis qu'ils ont été amplifiés au cours de la formation des structures. La turbulence dans les galaxies et les amas de galaxies modifie totalement l'organisatio

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35

Hoffmann, Kai Delf. "Cosmology with galaxy clustering." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/297700.

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Per constrènyer models cosmològics mitjançant el creixement de les fluctuacions a gran escala de la matèria és cabdal entendre com les galàxies que observem tracen el camp de densitat de tot el conjunt de matèria. La relació entre el camp de densitat de matèria i el de galàxies s'acostuma a aproximar amb una expansió de segon ordre de la funció anomenada bias. La llibertat en els paràmetres d'aquesta funció redueix la informació cosmològica que es pot extreure de les observacions. En aquesta tesi estudiem dos mètodes per determinar els paràmetres del bias independentment del creixement. L'anàl

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36

Suzuki, Nao. "Cosmology from quasar spectra." Diss., Connected to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2005. http://wwwlib.umi.com/cr/ucsd/fullcit?p3189997.

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Thesis (Ph. D.)--University of California, San Diego, 2005.<br>Title from first page of PDF file (viewed March 7, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 344-361).

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37

Mannellli, Lorenzo. "Quantum gravity and cosmology /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2005. http://uclibs.org/PID/11984.

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38

Gil-Merino, Rubio Rodrigo. "Cosmology through gravitational lenses." Phd thesis, [S.l. : s.n.], 2003. http://pub.ub.uni-potsdam.de/2004/0003/rubio.pdf.

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39

Kujat, Jens. "Scalar fields in cosmology." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1142978764.

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40

Vakili, Mohammadjavad. "Methods in Computational Cosmology." Thesis, New York University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10260795.

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<p> State of the inhomogeneous universe and its geometry throughout cosmic history can be studied by measuring the clustering of galaxies and the gravitational lensing of distant faint galaxies. Lensing and clustering measurements from large datasets provided by modern galaxy surveys will forever shape our understanding of the how the universe expands and how the structures grow. Interpretation of these rich datasets requires careful characterization of uncertainties at different stages of data analysis: estimation of the signal, estimation of the signal uncertainties, model predictions, and c

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41

Reza, Zadeh Hamid Reza. "Sterile Neutrinos and Cosmology." Thesis, Uppsala universitet, Högenergifysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-338759.

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42

Pisani, Alice. "Cosmology with cosmic voids." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066240/document.

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Les missions modernes permettent d’accéder à des mesures de qualité pour les grandes structures, en échantillonnant la distribution de galaxies en détail jusque dans les régions les moins denses, les vides. Toutefois, nous observons les vides dans l’espace des redshift, ce qui limite notre connaissance de ces structures. Afin d’utiliser les vides en tant qu’outils cosmologiques de précision, il est fondamental d’obtenir leur forme dans l’espace réel. Dans cette thèse nous présentons un algorithme non-paramétrique permettant de reconstruire les profils de densité sphérique des vides empilés dan

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43

Kuhlen, Michael. "Adventures in numerical cosmology /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2006. http://uclibs.org/PID/11984.

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44

Vinet, Jérémie. "Aspects of braneworld cosmology." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86059.

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What is essential is invisible to the eye. Antoine de Saint-Exupery<br>Of course, Saint-Exupery didn't have extra dimensions in mind when he wrote this famous line. Nevertheless, the recent realisation that standard model degrees of freedom can naturally be restricted to a submanifold embedded in a higher dimensional Universe means that an ingredient essential to our description of nature might quite literally be "invisible to the eye".<br>Exploring the consequences of such braneworld scenarios has occupied a large part of the theoretical physics community over the last seven years, and

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45

Brook, Mark N. "Cosmology meets condensed matter." Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/11250/.

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This thesis is concerned with the interface of cosmology and condensed matter. Although at either end of the scale spectrum, the two disciplines have more in common than one might think. Condensed matter theorists and high-energy field theorists study, usually independently, phenomena embedded in the structure of a quantum field theory. It would appear at first glance that these phenomena are disjoint, and this has often led to the two fields developing their own procedures and strategies, and adopting their own nomenclature. We will look at some concepts that have helped bridge the gap betwee

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Carvalho, C. "Cosmology of braneworld universes." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597344.

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The motivation of this study is the eventual application to calculating braneworld cosmological perturbations in order to determine observational signatures for the existence of extra dimensions. First, we construct five-dimensional bulk spacetime solutions, empty except for a negative cosmological constant, in the absence of any cosmological perturbations. Taking a higher-dimensional variant of Birkoff’s theorem, we find anti-de Sitter bulk solutions to the five-dimensional Einstein equations exhibiting three-dimensional spatial homogeneity and isotropy. We introduce branes as spacetime traje

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47

Ashcroft, P. R. "Cosmology with scalar fields." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596177.

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In this thesis we investigate a number of roles that scalar fields can play in cosmology. In particular it is generally believed that the early Universe underwent a period of very rapid expansion. We call this epoch <i>inflation</i>. Initially we investigate the evolution of two slow-rolling scalar fields with potentials of the form <i>V = V<sub>o</sub>φ</i><sup>-</sup><sup>a</sup> exp(-<i>bφ<sup>m</sup></i>). By considering different values of the parameters a, b and <i>m</i>, we drive several new inflationary solutions in which one field just evolves in the background and is not important fo

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48

Bridle, S. L. "Bayesian methods in cosmology." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596905.

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This thesis is concerned with the amount and distribution of dark matter in the universe and makes use of Bayesian techniques to extract maximal information. I have been using two independent approaches. I have (i) compared and combined cosmological parameter estimates from various cosmological probes and (ii) I have developed a method for estimating the mass distribution in clusters of galaxies using gravitational lensing. The first approach tests cosmological theories and estimates the cosmological parameters, including the total amount of matter. The second produces maps of the dark matter

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49

Bridges, M. "Statistical methods in cosmology." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596904.

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We outline the application of a new method of evidence calculation called nested sampling Skilling (2004). We use a clustered ellipsoidal bound to restrict the parameter space sampled, that is generic enough to be used for even complex multimodal posteriors. We demonstrate our algorithms, COSMOCLUST makes important savings in computational time when compared with previous methods. The study of the primordial power spectrum, which seeded the structure formation observed in both the CMB and large scale structure, is crucial in unravelling early universe physics. In this thesis we analyse a numb

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50

Padilla, Antonio. "Braneworld cosmology and holography." Thesis, Durham University, 2002. http://etheses.dur.ac.uk/4628/.

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This thesis is devoted to studying two important aspects of braneworld physics: their cosmology and their holography. We examine the Einstein equations induced on a general (n - 2)-brane of arbitrary tension, embedded in some n-dimensional bulk. The brane energy-momentum tensor enters these equations both linearly and quadratically. From the point of view of a homogeneous and isotropic brane we see quadratic deviations from the FRW equations of the standard cosmology. There is also a contribution from a bulk Weyl tensor. We study this in detail when the bulk is AdS-Schwarzschild or Reissner-No

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