Relevant bibliographies by topics / Friedmann-Robertson-Walker cosmologies

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Academic literature on the topic 'Friedmann-Robertson-Walker cosmologies'

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Published: 14 March 2023

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Journal articles on the topic "Friedmann-Robertson-Walker cosmologies"

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Visser, Matt. "Conformally Friedmann–Lemaître–Robertson–Walker cosmologies." Classical and Quantum Gravity 32, no. 13 (June 4, 2015): 135007. http://dx.doi.org/10.1088/0264-9381/32/13/135007.

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Bikwa, Ojeh, Fulvio Melia, and Andrew Shevchuk. "Photon geodesics in Friedmann-Robertson-Walker cosmologies." Monthly Notices of the Royal Astronomical Society 421, no. 4 (February 21, 2012): 3356–61. http://dx.doi.org/10.1111/j.1365-2966.2012.20560.x.

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Esposito, Giampiero, Gennaro Miele, Luigi Rosa, and Pietro Santorelli. "Quantum effects in Friedmann - Robertson - Walker cosmologies." Classical and Quantum Gravity 12, no. 12 (December 1, 1995): 2995–3005. http://dx.doi.org/10.1088/0264-9381/12/12/015.

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Mak, M. K., and T. Harko. "Exact causal bulk viscous stiff cosmologies." Australian Journal of Physics 53, no. 2 (2000): 241. http://dx.doi.org/10.1071/ph99067.

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An exact solution of the gravitational field equations is presented for a homogeneous flat Friedmann-Robertson-Walker universe filled with a causal bulk viscous fluid obeying the Zeldovich stiff equation of state and having bulk viscosity coefficient proportional to the fourth root of the energy density.
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Dyer, Charles C., and Chris Oliwa. "Matching of Friedmann-Lemaître-Robertson-Walker and Kasner cosmologies." Classical and Quantum Gravity 18, no. 14 (June 29, 2001): 2719–29. http://dx.doi.org/10.1088/0264-9381/18/14/309.

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Dyer, Charles C., Sylvie Landry, and Eric G. Shaver. "Matching of Friedmann-Lemaître-Robertson-Walker and Kasner cosmologies." Physical Review D 47, no. 4 (February 15, 1993): 1404–6. http://dx.doi.org/10.1103/physrevd.47.1404.

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Melia, F. "The lapse function in Friedmann—Lemaître–Robertson–Walker cosmologies." Annals of Physics 411 (December 2019): 167997. http://dx.doi.org/10.1016/j.aop.2019.167997.

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Singh, T., R. Chaubey, and Ashutosh Singh. "Bouncing cosmologies in Brans–Dicke theory." Canadian Journal of Physics 94, no. 7 (July 2016): 623–27. http://dx.doi.org/10.1139/cjp-2016-0081.

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In this paper it is shown that in Brans–Dicke theory, if one considers a non-minimal coupling between the matter and scalar field, can give rise to a bouncing universe (i.e., an expanding universe preceded by a contracting universe). Two examples of such universes have been considered in a spatially flat Friedmann–Robertson–Walker universe and their physical properties have been studied.
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MAIER, R., I. DAMIÃO SOARES, and E. V. TONINI. "NONLINEAR RESONANCE IN BRANEWORLD COSMOLOGIES." International Journal of Modern Physics A 24, no. 08n09 (April 10, 2009): 1510–13. http://dx.doi.org/10.1142/s0217751x09044905.

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The phase space dynamics of preinflationary closed Friedmann-Robertson-Walker (FRW) models is examined in a string-inspired bulk-brane scenario. Friedmann equations on the brane contain correction terms arising from the brane-bulk interaction that implement nonsingular metastable bounces in the early evolution of the universe. The matter content of the model is a massive inflaton field plus dust and/or radiation. In narrow windows of the parameter space, labeled by an integer n ≥ 2, nonlinear resonance phenomena destroy KAM tori that trap the inflaton, leading to a graceful entrance to inflation. As a consequence nonlinear resonance imposes constraints on the physical parameters, and in the initial configurations of the models so that inflation may be realized.
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Forte, Mónica. "Kinematic equivalence between models driven by DBI field with constant γ and exotic holographic quintessence cosmological models." Modern Physics Letters A 32, no. 26 (August 11, 2017): 1750140. http://dx.doi.org/10.1142/s0217732317501401.

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We show the kinematic equivalence between cosmological models driven by Dirac–Born–Infeld (DBI) fields [Formula: see text] with constant proper velocity of the brane and exponential potential [Formula: see text], and interactive cosmological systems with modified holographic Ricci type fluids as dark energy (DE) in flat Friedmann–Robertson–Walker (FRW) cosmologies.
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Dissertations / Theses on the topic "Friedmann-Robertson-Walker cosmologies"

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Di, Gennaro Sofia. "Modelli cosmologici di Friedmann-Robertson-Walker." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14518/.

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In questa trattazione si analizzano i principi base da cui si deriva la teoria della cosmologia standard, basata sul modello di Friedmann-Robertson-Walker. Si comincia con l’esposizione del principio cosmologico, che stabilisce l’omogeneità e isotropia dell’Universo alle grandi scale e del postulato di Weyl. Da essi si ricava poi la metrica di Friedmann-Robertson-Walker, che permette di definire una struttura causale in un Universo in espansione. Dalla metrica e dalle equazioni di campo di Einstein si ottengono poi le equazioni di Friedmann, le quali a loro volta possono essere integrate, ottenendo alcuni modelli importanti. Infine, si approfondiscono i concetti di redshift e determinazione delle distanze, concetti molto utili per misurare i parametri che regolano l’evoluzione dell’Universo.
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Challane, Tlemsani Sofiane. "Le problème de l'horizon dans les modèles cosmologiques de Friedmann-Robertson-Walker." Montpellier 2, 1993. http://www.theses.fr/1993MON20239.

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La these presentee traite, dans le cadre de la cosmologie standard (modeles de friedman-robertson-walker), du probleme de l'horizon. Dans une premiere partie, on etudie de facon explicite la condition d'homogeneisation causale d'une hypersurface caracterisee par une coordonnee temporelle constante. Appliquant cette condition a l'hypersurface de recombinaison, on montre que cette condition ne peut en aucun cas etre satisfaite. Le probleme de l'horizon dans le cas etudie du rayonnement a 3 k, ne se reduit apparemment pas a un probleme observationnel. La seconde partie se presente comme une alternative possible aux scenarios inflationnaires. On prend comme hypothese de base (dans le cadre f. R. W) le fait que, initialement, l'univers n'est pas decelere. Pendant une periode initiale, le fluide cosmique, n'est plus representable par un tenseur energie-impulsion de type fluide parfait. On retrouve alors une situation abondamment etudiee: le fluide cosmique est dissipatif (introduction d'une viscosite de volume). Cette situation est ici exploitee, non pour eliminer la singularite initiale (comme c'est le cas usuellement), mais pour faire jouer a la phase visqueuse le role d'une phase d'homogeneisation causale. La solution correspondant a cette phase entraine que sur un court intervalle de temps, l'univers ne possede pas encore d'horizon-particule. Dans la troisieme partie, on etudie la validite du comportement du facteur d'echelle pres de la singularite initiale pour les trois cas de courbures possibles
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Souza, Cleber Abrahão de. "Campos de Dirac no universo de Friedmann-Lemaitre-Robertson-Walker." Universidade Federal de Juiz de Fora (UFJF), 2011. https://repositorio.ufjf.br/jspui/handle/ufjf/5345.

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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
A teoria relativística da gravitação é uma ferramenta fundamental para a compreensão da cosmologia moderna. Ela descreve a dinâmica do campo gravitacional ao longo do espaço-tempo. Dentre os possíveis modelos de universo, um dos mais comuns é o descrito pela métrica de Friedmann-Lemaitre-Robertson-Walker (FLRW). Esta métrica pode ser escrita em termos do tempo conforme e descreve um universo homogêneo e isotrópico. Neste trabalho investigamos os campos de Dirac não massivos neste modelo de universo. Os resultados mostram uma compatibilidade entre as equações de Dirac e a métrica de FLRW. Os efeitos do parâmetro de Immirzi junto com os férmions podem ser descritos em termos de um fluido perfeito usual intermediário entre a poeira e radiação.
The general relativity theory is fundamental tool for understanding the modern cosmology. In this work we investigated the massless Dirac fields in the Friedamm-Lamaitre-Robertson-Walker universe. The metric is written in terms of conformal time which describes a homogeneous and isotropic universe. We show that the effects of Immirzi parameter along with the fermions can be described in terms of a usual perfect fluid intermediate between dust and radiation.
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SANTOS, Fábio Magalhães de Novaes. "Cosmologia inflacionária e o problema da medida." Universidade Federal de Pernambuco, 2009. https://repositorio.ufpe.br/handle/123456789/6458.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico
No século XX, a cosmologia deixou o campo da metafísica para ser consolidada como um ramo da ciência teórica e experimental. Nos últimos anos tem sido observado um grande avanço no importante aparato observacional da cosmologia tornando possível sondar eventos físicos que ocorreram a cerca de 13 bilhões de anos, supostamente ocorridos próximos à singularidade inicial conhecida como Big Bang. Entretanto, muitos mistérios permanecem esperando para ser resolvidos neste novo e promissor século. Entre eles estão as questões da formação de estruturas cosmológicas e das flutuações de densidade na radiação cósmica de fundo (CMB). A solução mais popular parece ser a chamada inflação cosmológica, a ideia de que um período de expansão acelerada ocorrido cerca de 10��43 s após o início do Universo poderia explicar as condições iniciais do Big Bang e o espectro da CMB. Neste trabalho, analisamos a generalidade do modelo mais simples e mais usado na literatura, o modelo f-FRW, e suas propriedades no espaço de fase da teoria. A ação estudada consiste na de Einstein-Hilbert onde supomos uma métrica do tipo Robertson-Walker acoplada com um campo escalar f e um potencial arbitrário V(f). Aplicamos a equação de Wheeler-DeWitt no modelo f-FRW e, então, propomos uma medida quântica no espaço de fase modificada pelo princípio holográfico de forma a contar heuristicamente a degenerescência proveniente dos graus de liberdade quânticos da gravitação
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Book chapters on the topic "Friedmann-Robertson-Walker cosmologies"

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"Friedmann–Robertson–Walker Cosmologies." In Exact Solutions in Three-Dimensional Gravity, 108–20. Cambridge University Press, 2017. http://dx.doi.org/10.1017/9781316556566.010.

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"Dilaton–Inflaton Friedmann–Robertson–Walker Cosmologies." In Exact Solutions in Three-Dimensional Gravity, 121–41. Cambridge University Press, 2017. http://dx.doi.org/10.1017/9781316556566.011.

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"4. Friedmann-Robertson-Walker Models: Begin with a Bang." In Homogeneous Relativistic Cosmologies, 57–73. Princeton University Press, 2015. http://dx.doi.org/10.1515/9781400868568-005.

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d’Inverno, Ray, and James Vickers. "Relativistic cosmology." In Introducing Einstein's Relativity, 481–510. 2nd ed. Oxford University PressOxford, 2022. http://dx.doi.org/10.1093/oso/9780198862024.003.0024.

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Abstract Chapter 24 introduces the field of cosmology. It starts by considering Olber’s paradox and then constructs a simple Newtonian cosmology model. It then discusses the cosmological principle and Weyl’s postulate as assumptions that go into formulating relativistic cosmology. It shows how this leads to the Robertson–Walker metrics and how, when these are substituted into Einstein’s equations, one obtains the Friedmann equation, which is an evolution equation for space-time. The geometry of such Friedmann–Robertson–Walker (FRW, for short) solutions is then studied, which leads to so-called FRW cosmologies. Finally, it is shown that these satisfy Hubble’s law, in which the velocity of recession of distant stars, as defined by their gravitational red shift, is (approximately) proportional to their distance from the observer.
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Conference papers on the topic "Friedmann-Robertson-Walker cosmologies"

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García, Alberto A. "n-dimensional Friedmann-Robertson-Walker cosmologies." In GRAVITATION AND COSMOLOGY: 2nd Mexican Meeting on Mathematical and Experimental Physics. AIP, 2005. http://dx.doi.org/10.1063/1.1900525.

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