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Готові списки джерел за темами / Analog cosmology

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Добірка наукової літератури з теми "Analog cosmology"

Автор: Grafiati

Опубліковано: 11 березня 2023

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Статті в журналах з теми "Analog cosmology"

1

Bilic, Neven, and Dijana Tolic. "Analogue cosmology in a hadronic fluid." Facta universitatis - series: Physics, Chemistry and Technology 12, no. 2 (2014): 77–83. http://dx.doi.org/10.2298/fupct1402077b.

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Analog gravity models of general relativity seem promising routes to providing laboratory tests of the foundation of quantum field theory in curved space-time. In contrast to general relativity, where geometry of a spacetime is determined by the Einstein equations, in analog models geometry and evolution of analog spacetime are determined by the equations of fluid mechanics. In this paper we study the analogue gravity model based on massless pions propagating in a expanding hadronic fluid. The analog expanding spacetime takes the form of an FRW universe, with the apparent and trapping horizons

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2

ELLIS, JOHN, D. V. NANOPOULOS, and N. E. MAVROMATOS. "A STRING SCENARIO FOR INFLATIONARY COSMOLOGY." Modern Physics Letters A 10, no. 23 (1995): 1685–98. http://dx.doi.org/10.1142/s0217732395001800.

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We describe a scenario for inflation in the framework of noncritical string theory, which does not employ an inflaton field. There is an exponential expansion of the volume of the Universe, induced by enormous entropy production in the early stages of cosmological evolution. This is associated with the loss of information carried by global string modes that cross the particle horizon. It is the same loss of information that induces irreversible time flow when target time is identified with the worldsheet Liouville mode. The resulting scenario for inflation is described by a string analog of th

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3

Falomir, Horacio, Jorge Gamboa, and Fernando Mendez. "A Noncommutative Model of Cosmology with Two Metrics." Symmetry 12, no. 3 (2020): 435. http://dx.doi.org/10.3390/sym12030435.

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We propose a bicosmology model which reduces to the classical analog of noncommutative quantum mechanics. From this point of view, one of the sources in the so modified Friedmann-Robertson- Walker equations is a kind of dark energy governed by a Chapligyn-like equation of state. The parameters of noncommutativity θ and B are interpreted in terms of the Planck area and a magnetic-like field, which presumably acts as a seed for magnetogenesis.

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4

Socorro, J., Luis O. Pimentel, and Abraham Espinoza-García. "Classical Bianchi Type I Cosmology in K-Essence Theory." Advances in High Energy Physics 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/805164.

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Анотація:

We use one of the simplest forms of the K-essence theory and we apply it to the classical anisotropic Bianchi type I cosmological model, with a barotropic perfect fluid (p=γρ) modeling the usual matter content and with cosmological constantΛ. Classical exact solutions for anyγ≠1andΛ=0are found in closed form, whereas solutions forΛ≠0are found for particular values in the barotropic parameter. We present the possible isotropization of the cosmological model Bianchi I using the ratio between the anisotropic parameters and the volume of the universe. We also include a qualitative analysis of the

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5

GÓRKA, PRZEMYSŁAW, TOMASZ KOSTRZEWA, and ENRIQUE G. REYES. "THE RELLICH LEMMA ON COMPACT ABELIAN GROUPS AND EQUATIONS OF INFINITE ORDER." International Journal of Geometric Methods in Modern Physics 10, no. 02 (2012): 1220030. http://dx.doi.org/10.1142/s0219887812200307.

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Partially motivated by a class of nonlinear equations of interest for string theory, cosmology and p-adic analysis, we continue our research on Sobolev spaces on arbitrary locally compact abelian (LCA) groups. In this paper we focus on an analog for LCA groups of the classical Rellich compactness theorem. As an application, we prove the existence of continuous solutions to a generalized Euclidean bosonic string equation posed on a compact abelian group.

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6

Górka, Przemysław, Tomasz Kostrzewa, and Enrique G. Reyes. "Sobolev Spaces on Locally Compact Abelian Groups: Compact Embeddings and Local Spaces." Journal of Function Spaces 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/404738.

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Анотація:

We continue our research on Sobolev spaces on locally compact abelian (LCA) groups motivated by our work on equations with infinitely many derivatives of interest for string theory and cosmology. In this paper, we focus on compact embedding results and we prove an analog for LCA groups of the classical Rellich lemma and of the Rellich-Kondrachov compactness theorem. Furthermore, we introduce Sobolev spaces on subsets of LCA groups and study its main properties, including the existence of compact embeddings intoLp-spaces.

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7

GIANG, DAN, and CHARLES C. DYER. "CONSTRUCTING AN INHOMOGENEOUS BRANEWORLD THROUGH SPACE–TIME MATCHING." International Journal of Modern Physics D 18, no. 12 (2009): 1913–41. http://dx.doi.org/10.1142/s021827180901576x.

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Анотація:

We attempt to construct the braneworld analog of the cheese slice universe, an inhomogeneous cosmology constructed from alternating layers of Kasner and FLRW space–times. This construction is possible in four dimensions and we find that the energy conditions can be satisfied in the braneworld context. However, an extension into the bulk becomes more problematic. We use a 3 + 1 + 1 decomposition inspired by the ADM decompositions to show that structure is required in the bulk to support an inhomogeneous brane.

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8

Gorobey, Natalia, and Alexander Lukyanenko. "Ground state of the universe in quantum cosmology." International Journal of Modern Physics A 31, no. 02n03 (2016): 1641014. http://dx.doi.org/10.1142/s0217751x16410141.

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Анотація:

We find a physical state of a closed universe with the minimal excitation of the universe expansion energy in quantum gravity. It is an analog of the vacuum state of the ordinary quantum field theory in the Minkowsky space, but in our approach an energy of space of a closed universe together with the energy of its matter content are minimized. This ground state is chosen among an enlarged set of physical states, compared with the ordinary covariant quantum gravity. In our approach, physical states are determined by weak constraints: quantum mechanical averages of gravitational constraint opera

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9

K.Shchigolev, V. "Applying He's variational iteration method to FRW cosmology." International Journal of Advanced Astronomy 7, no. 2 (2019): 39. http://dx.doi.org/10.14419/ijaa.v7i2.29428.

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Анотація:

This work is devoted to the investigation of Friedmann-Robertson-Walker (FRW) cosmological models with the help of the so-called Variational Iteration Method (VIM). For this end, we briefly recall the main equations of the cosmological models and the basic idea of VIM. In order to approbate the VIM in FRW cosmology and demonstrate the main steps in solving by this method, we consider the test example of the universe with dust for which the exact solution of the model is known. Then, a solution for the spatially flat FRW model of the universe filled with the dust and quintessence is obtained wh

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10

Nojiri, Shin'ichi, and Sergei D. Odintsov. "Multiple lambda cosmology: Dark fluid with time-dependent equation of state as classical analog of cosmological landscape." Physics Letters B 649, no. 5-6 (2007): 440–44. http://dx.doi.org/10.1016/j.physletb.2007.02.042.

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Дисертації з теми "Analog cosmology"

1

Rossoni, Mattos Diego. "Design and characterization of an 8gsps flash analog-to-digital converter for radio astronomy and cosmology applications." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14653/document.

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Un Convertisseur Analogique-Numérique (CAN) pour les applications spatiales en astrophysique et cosmologie a été développé au cours de cette thèse. Cette catégorie de circuits demande des bandes passantes très larges, de très hautes fréquences d'échantillonnage et une faible résolution. L’architecture flash a été retenue pour sa rapidité et sa bande passante. La fréquence d’échantillonnage est de 8GHz. La technologie utilisée est la CMOS 65 nm de chez STMicroeletronics. La conception a été faite en deux phases. Une première qui a amené à un prototype d'un échantillonneur-bloqueur et une deuxiè

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2

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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3

Azevedo, Frankbelson dos Santos. "Contribution to the Study of Topological Defects and their Applications in Optics." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0198/document.

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Анотація:

Dans cette thèse, notre étude porte sur les défauts topologiques en cosmologie et en physique de la matière condensée. Nous proposons d’étudier l’analogie entre les défauts qui apparaissent dans ces domaines. Par exemple, nous discutons l’analogie entre les cordes cosmiques et les disinclinaisons présentes dans les cristaux liquides. Cependant, nous concentrons nos efforts sur l’étude de la gravité et des aspects géométriques des défauts linéaires; cordes cosmiques «ondulées» et les disinclinaisons hyperboliques. Le champ gravitationnel des cordes ondulées est analogue à celui des cordes régul

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4

ROITBERG, ALICE. "Gross-Pitaevskii hydrodynamics in Riemannian manifolds and application in Black Hole cosmology." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2023. https://hdl.handle.net/10281/404710.

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In questa tesi ci si propone di analizzare le implicazioni fisiche della geometria dello spazio ambiente nel contesto dei condensati di Bose-Einstein (BEC) e le possibili applicazioni nell’ambito dei modelli analogici della cosmologia dei buchi neri. A tal fine si deriva la formulazione idrodinamica dell'equazione di Gross-Pitaevskii (GPE) nel caso di una generica varietà Riemanniana e si osserva la comparsa di una nuova forza, che dipende essenzialmente da due parametri: la geometria della varietà e le derivate prime del profilo di densità. Si studiano le condizioni stazionarie in relazione a

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5

Geier, Kevin Thomas. "Probing Dynamics and Correlations in Cold-Atom Quantum Simulators." Doctoral thesis, Università degli studi di Trento, 2022. http://hdl.handle.net/11572/351120.

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Cold-atom quantum simulators offer unique possibilities to prepare, manipulate, and probe quantum many-body systems. However, despite the high level of control in modern experiments, not all observables of interest are easily accessible. This thesis aims at establishing protocols to measure currently elusive static and dynamic properties of quantum systems. The experimental feasibility of these schemes is illustrated by means of numerical simulations for relevant applications in many-body physics and quantum simulation. In particular, we introduce a general method for measuring dynamical corre

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6

Reyburn, Duncan. "Chestertonian dramatology." Thesis, University of Pretoria, 2012. http://hdl.handle.net/2263/30301.

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Анотація:

This study proposes an answer to the question of what the contemporary relevance of the writings of GK Chesterton (1874-1936) may be to the field of visual culture studies in general and to discourse on visual hermeneutics in particular. It contends that Chesterton’s distinctive hermeneutic strategy is dramatology: an approach rooted in the idea that being, which is disclosed to itself via language, has a dramatic, storied structure. It is this dramatology that acts as an answer to any philosophical outlook that would seek to de-dramatise the hermeneutic experience. The structure of Chesterton

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7

Radermacher, Katharina Maria. "Strong Cosmic Censorship and Cosmic No-Hair in spacetimes with symmetries." Doctoral thesis, KTH, Matematik (Avd.), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-220400.

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This thesis consists of three articles investigating the asymptotic behaviour of cosmological spacetimes with symmetries arising in Mathematical General Relativity. In Paper A and B, we consider spacetimes with Bianchi symmetry and where the matter model is that of a perfect fluid. We investigate the behaviour of such spacetimes close to the initial singularity ('Big Bang'). In Paper A, we prove that the Strong Cosmic Censorship conjecture holds in non-exceptional Bianchi class B spacetimes. Using expansion-normalised variables, we further show detailed asymptotic estimates. In Paper B, we pro

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8

Lacoste, Frédéric. "L'oiseau dans la poésie de Saint-John Perse, Kenneth White et Philippe Jaccottet : une pensée analogique au service du mystère." Bordeaux 3, 2006. https://extranet.u-bordeaux-montaigne.fr/memoires/diffusion.php?nnt=2006BOR30021.

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La question de l'oiseau dans la poésie contemporaine se pose avec une certaine évidence. Impossible, semble-t-il, d'ouvrir un recueil de poèmes sans tomber à de nombreuses reprises sur des références explicites à l'oiseau : à son vol bien sûr, mais aussi à son chant, à sa présence discrète mais permanente. Comment expliquer cette re��currence dans la production contemporaine ? Et qu'est-ce qui constitue la singularité de l'oiseau dans le règne animal ? Après avoir justifié le rapprochement des trois poètes de notre corpus, nous avons fondé notre travail selon des perspectives analogiques et tr

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Книги з теми "Analog cosmology"

1

Cosmology and self in the Apostle Paul: The material spirit. Oxford University Press, 2010.

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2

War and ethics in the ancient Near East: Military violence in light of cosmology and history. Walter de Gruyter, 2009.

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3

Annihilation or renewal?: The meaning and function of new creation in the book of Revelation. Mohr Siebeck, 2011.

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4

Mashhoon, Bahram. Nonlocal Newtonian Cosmology. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198803805.003.0010.

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We explore some of the cosmological implications of nonlocal gravity (NLG) theory, in which nonlocality is due to the gravitational memory of past events. Memory dies out in space and time. The fading of memory in time implies that in NLG the strength of the gravitational interaction must decrease with cosmic time. In the Newtonian regime of NLG, the nonlocal character of gravity simulates dark matter in spiral galaxies and clusters of galaxies. However, dark matter is considered indispensable as well for structure formation in standard models of cosmology. Can nonlocal gravity solve the probl

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5

Wittman, David M. Beyond the Schwarzschild Metric. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199658633.003.0019.

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General relativity explains much more than the spacetime around static spherical masses.We briefly assess general relativity in the larger context of physical theories, then explore various general relativistic effects that have no Newtonian analog. First, source massmotion gives rise to gravitomagnetic effects on test particles.These effects also depend on the velocity of the test particle, which has substantial implications for orbits around black holes to be further explored in Chapter 20. Second, any changes in the sourcemass ripple outward as gravitational waves, and we tell the century‐l

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6

Schenck, Kenneth L. Cosmology and Eschatology in Hebrews: The Settings of the Sacrifice. Cambridge University Press, 2007.

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7

Schenck, Kenneth L. Cosmology and Eschatology in Hebrews: The Settings of the Sacrifice. Cambridge University Press, 2009.

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8

Schenck, Kenneth L. Cosmology and Eschatology in Hebrews: The Settings of the Sacrifice. Cambridge University Press, 2008.

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9

Schenck, Kenneth L. Cosmology and Eschatology in Hebrews: The Settings of the Sacrifice. Cambridge University Press, 2010.

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10

Schenck, Kenneth L. Cosmology and Eschatology in Hebrews: The Settings of the Sacrifice. Cambridge University Press, 2007.

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Частини книг з теми "Analog cosmology"

1

"THE GOLD ANALOGY IN THE TIMAEUS." In Platonic cosmology. BRILL, 1985. http://dx.doi.org/10.1163/9789004320642_006.

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2

Anderson, Judith H. "Proportional Thinking in Kepler’s Science of Light." In Light and Death. Fordham University Press, 2017. http://dx.doi.org/10.5422/fordham/9780823272778.003.0006.

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Light is at the center of Kepler’s optics, astronomy, and cosmology. Verbal and mathematical analogy, whether as concept, proportion, or both, is crucial to his methodology and his habits of thought. Kepler is an intellectual hybrid who combines Neoplatonic and perspectivist ideas about light with mathematical and physical discoveries anticipating those of Descartes and Newton. Kepler is strikingly engaged with the interface of the immaterial with the material that light effects, as well as with correspondences and other connections between the celestial and terrestrial realms. Analogy, the salient means of linking the known with the unknown, the abstract with the sensible, is conspicuous throughout his work. This chapter focuses on Kepler’s study of light, geometric optics, and their bearing on the observation of astronomical phenomena. Both Donne and Milton were acquainted with Kepler’s ideas (as with Spenser’s).

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3

Allen, Edward. "Nocturne." In Forms of Late Modernist Lyric. Liverpool University Press, 2022. http://dx.doi.org/10.3828/liverpool/9781789622423.003.0011.

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This chapter is about the night song, or nocturne, and the extent to which it has provided J. H. Prynne with a formal correlative for his nocturnal habits. It did so at a crucial moment in the poet’s career – the 1960s – just as he was composing the lyrics that would eventually find a home in The White Stones (1969). Those years witnessed significant strides in space exploration – particularly for the Soviet Union and for the United States – just as they did for political causes of one kind and another, including the Civil Rights movement. Prynne was attentive to such movements, with the result that the nocturne became in his hands a vehicle for thinking about the sorts of macro-historical developments that others (Ezra Pound, Charles Olson) had once explored in the epic form. The chapter is about the politics of cosmology, then, but it is also about the longer history of nocturne-writing. As well as touching on poets central to the evolving genre, the chapter looks to other media such as visual art and music (James McNeill Whistler’s paintings, Fryderyk Chopin’s piano writing) in order to assess the kinds of analogy that might help to thicken a description of the nocturne genre.

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Тези доповідей конференцій з теми "Analog cosmology"

1

PORTO, RAFAEL A., and A. ZEE. "REASONING BY ANALOGY: ATTEMPTS TO SOLVE THE COSMOLOGICAL CONSTANT PARADOX." In Quantum Mechanics, Elementary Particles, Quantum Cosmology and Complexity. WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814335614_0035.

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2

Marshall, Oriel, Rita Tojeiro, and Anne-Marie Weijmans. "Demonstrating cosmological and Doppler redshift in the classroom." In Symposium on Space Educational Activities (SSAE). Universitat Politècnica de Catalunya, 2022. http://dx.doi.org/10.5821/conference-9788419184405.098.

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Cosmology is often a difficult subject to teach as it can involve many confusing and sometimes abstract concepts. One particular topic with many existing misconceptions and difficulties surrounding it is redshift, specifically the difference between Doppler shift (due to the peculiar velocities of galaxies) and cosmological redshift (due to the expansion of the side). Redshift of galaxies, despite being an extremely useful and interesting scientific tool, can often become a tedious subject to teach as it is largely theoretical and usually does not include demonstrations or interaction in the c

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3

ANDRADE, GIOVANI LUZ, RAMON ALVES DOS SANTOS, IAN LIMA SANTANA, and CARLOS TAKIYA. "SOBRE A RELAÇÃO ENTRE A FÍSICA DE PARTÍCULAS E A COSMOLOGIA: UMA ABORDAGEM E PROPOSTA DIDÁTICA PARA O ENSINO MÉDIO." In Brazilian Congress. brazco, 2020. http://dx.doi.org/10.51162/brc.dev2020-00041.

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Neste trabalho e feita uma descricao da relacao existente entre a Fisica de Particulas e a Cosmologia e, nesse interim, e realizada uma abordagem basica dos conceitos envolvidos nessa relacao, bem como propostas didatica e experimental para o ensino medio. Nessas propostas, abordamos o uso de livros de divulgacao cientifica como material complementar para o ensino medio e uma atividade experimental que permite uma analogia da expansao do universo. Mostra-se neste estudo que, a introducao de obras de divulgacao como material complementar em sala de aula proporciona um grande potencial para o pr

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4

Ferreira, Tiago D., João Novo, Orfeu Bertolami, Nuno A. Silva, and Ariel Guerreiro. "Analogue cosmology: using techniques from nonlinear optics to study modified theories of gravity with non-minimal coupling between curvature and matter." In Nonlinear Optics and Applications XII, edited by Anatoly V. Zayats, Mario Bertolotti, and Alexei M. Zheltikov. SPIE, 2021. http://dx.doi.org/10.1117/12.2592316.

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