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Dissertations / Theses on the topic 'Modelos de bianchi'

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Published: 4 June 2021
Last updated: 7 February 2022

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1

MATEUS, Dairo Antonio Cuellar. "Considerações Sobre a Anisotropia em Modelos Bianchi Tipo I." reponame:Repositório Institucional da UNIFEI, 2018. http://repositorio.unifei.edu.br/xmlui/handle/123456789/1149.

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Submitted by repositorio repositorio (repositorio@unifei.edu.br) on 2018-03-14T15:13:37Z No. of bitstreams: 1 dissertacao_mateus_2018.pdf: 847341 bytes, checksum: 0f440949b959493c6f26856e0f892577 (MD5)<br>Made available in DSpace on 2018-03-14T15:13:38Z (GMT). No. of bitstreams: 1 dissertacao_mateus_2018.pdf: 847341 bytes, checksum: 0f440949b959493c6f26856e0f892577 (MD5) Previous issue date: 2018-02<br>Neste trabalho apresentamos uma introdução matemática ao estudo de modelos cosmológicos espacialmente homogêneos, em especial aos modelos Bianchi tipo I, que são espacialmente planos. Neste ca
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2

Fay, Stéphane. "Cosmologies spatialement homogènes en théories tenseur-scalaires." Phd thesis, Université Paris-Diderot - Paris VII, 2004. http://tel.archives-ouvertes.fr/tel-00008063.

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Cette thèse étudie les modèles cosmologiques homogènes mais anisotropes en théories tenseur-scalaire. Son but est de déterminer les propriétés que doivent avoir ces théories afin que ces modèles possèdent asymptotiquement les caractéristiques dynamiques de notre Univers actuel ou apportent une réponse à certains de ses problèmes comme ceux de la constante cosmologique. La première partie de la thèse est consacrée à une introduction historique et à une justification physique des théories tenseur-scalaires de la gravitation et des modèles cosmologiques anisotropes. La seconde partie détaille les
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3

Cheng, A. D. Y. "Supersymmetric quantum Bianchi models." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597576.

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This thesis is about the quantum cosmology of supergravity theories, in particular <I>N</I> = 1 supergravity. In chapter 2, the Bianchi-IX model in <I>N</I> = 1 supergravity with a cosmological constant is investigated. This example is also restricted to the case of the <I>k</I> = +1 Friedmann universe. In chapter 3, the most general solution of the Lorentz constraints is found. Using this solution, <I>N </I>= 1 supergravity in the diagonal Bianchi-IX model is studied. The Hamilton-Jacobi<I> </I>equation is derived and completely solved. The Hartie-Hawking and wormhole actions are both found a
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4

Friedrichsen, James Edward. "Quantization of Bianchi type cosmological models /." Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p3004268.

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5

Matsas, George Emanuel Avraam [UNESP]. "Estudo do universo primitivo no modelo bianchi IX." Universidade Estadual Paulista (UNESP), 1988. http://hdl.handle.net/11449/132638.

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Made available in DSpace on 2016-01-13T13:27:28Z (GMT). No. of bitstreams: 0 Previous issue date: 1988. Added 1 bitstream(s) on 2016-01-13T13:32:52Z : No. of bitstreams: 1 000027525.pdf: 2858505 bytes, checksum: 4cd9e46473bee6967ff5307abaa055b0 (MD5)
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Matsas, George Emanuel Avraam. "Estudo do universo primitivo no modelo bianchi IX /." São Paulo : [s.n.], 1988. http://hdl.handle.net/11449/132638.

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7

Yearsley, J. M. "Anisotropic cosmologies and the role of matter." Thesis, University of Sussex, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259719.

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8

Hervik, Sigbjørn. "Mathematical cosmology : Bianchi models, asymptotics and extra dimensions." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616093.

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9

Nunes, Thiago Crisóstomo Carlos. "Relevância da dimensionalidade no modelo de Bianconi-Barabási." PROGRAMA DE PÓS-GRADUAÇÃO EM FÍSICA, 2017. https://repositorio.ufrn.br/jspui/handle/123456789/25467.

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Submitted by Automação e Estatística (sst@bczm.ufrn.br) on 2018-06-15T21:24:30Z No. of bitstreams: 1 ThiagoCrisostomoCarlosNunes_TESE.pdf: 12472846 bytes, checksum: 1798e6ecdabae3a96892d8b6260e77c0 (MD5)<br>Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2018-06-19T20:45:08Z (GMT) No. of bitstreams: 1 ThiagoCrisostomoCarlosNunes_TESE.pdf: 12472846 bytes, checksum: 1798e6ecdabae3a96892d8b6260e77c0 (MD5)<br>Made available in DSpace on 2018-06-19T20:45:08Z (GMT). No. of bitstreams: 1 ThiagoCrisostomoCarlosNunes_TESE.pdf: 12472846 bytes, checksum: 1798e6
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10

Pereyra, Pablo Hernán. "Soluções não-planas no modelo cosmológico Bianchi tipo V na teoria 5D-Espaço-Tempo-Massa." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 1999. http://hdl.handle.net/10183/127585.

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As teorias de gravitação invariante por escala propõem uma variação com relação ao tempo da constante gravitacional ou da massa dos objetos que constituem o universo. Desta forma a intensidade da interação gravitacional também se torna variável, modificando sensivelmente o comportamento do universo. Algumas teorias foram propostas no decorrer do século, porém, descartadas devido a problemas técnicos e de concordância com dados observacionais. trabalho a ser apresentado nesta dissertação está fundamentado em uma teoria de gravitação invariante por escala, a qual vem atualmente sendo desenvolvid
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11

Sandin, Patrik. "Cosmological Models and Singularities in General Relativity." Doctoral thesis, Karlstads universitet, Avdelningen för fysik och elektroteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-8206.

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This is a thesis on general relativity. It analyzes dynamical properties of Einstein's field equations in cosmology and in the vicinity of spacetime singularities in a number of different situations. Different techniques are used depending on the particular problem under study; dynamical systems methods are applied to cosmological models with spatial homogeneity; Hamiltonian methods are used in connection with dynamical systems to find global monotone quantities determining the asymptotic states; Fuchsian methods are used to quantify the structure of singularities in spacetimes without symmetr
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12

Bianchi, Lorenzo [Verfasser], Valentina [Akademischer Betreuer] Forini, Jan [Akademischer Betreuer] Plefka, and Arkady A. [Akademischer Betreuer] Tseytlin. "Perturbation theory for string sigma models / Lorenzo Bianchi. Gutachter: Valentina Forini ; Jan Plefka ; Arkady A. Tseytlin." Berlin : Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://d-nb.info/1084692643/34.

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13

Holgersson, David. "Lanczos potentialer i kosmologiska rumtider." Thesis, Linköping University, Department of Mathematics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2582.

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<p>We derive the equation linking the Weyl tensor with its Lanczos potential, called the Weyl-Lanczos equation, in 1+3 covariant formalism for perfect fluid Bianchi type I spacetime and find an explicit expression for a Lanczos potential of the Weyl tensor in these spacetimes. To achieve this, we first need to derive the covariant decomposition of the Lanczos potential in this formalism. We also study an example by Novello and Velloso and derive their Lanczos potential in shear-free, irrotational perfect fluid spacetimes from a particular ansatz in 1+3 covariant formalism. The existence of the
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14

Bianchini, Paolo [Verfasser], and de Ven Glenn [Akademischer Betreuer] van. "The internal kinematics of globular clusters. An intimate view, from models to observations / Paolo Bianchini ; Betreuer: Glenn van de Ven." Heidelberg : Universitätsbibliothek Heidelberg, 2016. http://d-nb.info/1180616642/34.

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15

Eriksson, Daniel. "Perturbative Methods in General Relativity." Doctoral thesis, Umeå : Department of Physics, Umeå University, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1488.

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16

Camborata, Caterina. "Modello stocastico per la plasticità sinaptica." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12046/.

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Nel sistema nervoso centrale i neuroni comunicano l'uno con l'altro attraverso le connessioni sinaptiche e sono soggetti a centinaia di stimoli, ma hanno la capacità di distinguerli l'uno dall'altro. L'abilità delle sinapsi di interpretare questi cambiamenti morfologici e biochimici è detta \textit{plasticità sinaptica} e l'obiettivo di questa tesi è proprio studiare un modello per le dinamiche di questo affascinante processo, da un punto di vista prima deterministico e poi stocastico. Infatti le reazioni che inducono la plasticità sinaptica sono ben approssimate da equazioni differenziali non
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17

Martineau, Killian. "Quelques aspects de cosmologie et de physique des trous noirs en gravitation quantique à boucles Detailed investigation of the duration of inflation in loop quantum cosmology for a Bianchi I universe with different inflaton potentials and initial conditions Some clarifications on the duration of inflation in loop quantum cosmology A first step towards the inflationary trans-Planckian problem treatment in loop quantum cosmology Scalar spectra of primordial perturbations in loop quantum cosmology Phenomenology of quantum reduced loop gravity in the isotropic cosmological sector Primordial Power Spectra from an Emergent Universe: Basic Results and Clarifications Fast radio bursts and the stochastic lifetime of black holes in quantum gravity Quantum fields in the background spacetime of a polymeric loop black hole Quasinormal modes of black holes in a toy-model for cumulative quantum gravity Seeing through the cosmological bounce: Footprints of the contracting phase and luminosity distance in bouncing models Dark matter as Planck relics without too exotic hypotheses A Status Report on the Phenomenology of Black Holes in Loop Quantum Gravity: Evaporation, Tunneling to White Holes, Dark Matter and Gravitational Waves." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY044.

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Cantonnée à la physique mathématique depuis des décennies, la gravitation quantique entre désormais dans le giron de la science expérimentale. Suivant cette mouvance nous considérons dans cette thèse trois cadres d’application de la gravitation quantique à boucles (LQG) : le système Univers, les trous noirs et les astroparticules. Le troisième n’est qu’esquissé tandis que les deux premiers sont présentés plus en détails.Le secteur cosmologique étant l’un des domaines les plus prometteurs pour tester et contraindre des théories de gravité quantique, le développement de différents modèles tentan
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18

Ren, Lai Yu, and 賴祐仁. "Bianchi type II & VIh Models and Brane Cosmology." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/59584305962867137188.

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碩士<br>國立交通大學<br>物理研究所<br>96<br>In this thesis, we start at John D. Barrow’s paper, the “Anisotropically inflating universes”. We discuss the Bianchi type II & VIh for the Lagrangian density with the quadratic curvature terms, and calculate the energy-momentum tensor by solving the field equation. However, the energy condition is violated. So we introduce the concept of brane and discuss the extra dimension affect the field equation when we consider the 3-brane world. Finally we calculate the energy-momentum tensor of these two cosmology models once again.
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19

D'Ambroise, Jennie. "Generalized EMP and Nonlinear Schrodinger-type Reformulations of Some Scaler Field Cosmological Models." 2010. https://scholarworks.umass.edu/open_access_dissertations/225.

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We show that Einstein’s gravitational field equations for the Friedmann- Robertson-Lemaître-Walker (FRLW) and for two conformal versions of the Bianchi I and Bianchi V perfect fluid scalar field cosmological models, can be equivalently reformulated in terms of a single equation of either generalized Ermakov-Milne- Pinney (EMP) or (non)linear Schrödinger (NLS) type. This work generalizes or presents an alternative to similar reformulations published by the authors who inspired this thesis: R. Hawkins, J. Lidsey, T. Christodoulakis, T. Grammenos, C. Helias, P. Kevrekidis, G. Papadopoulos and F.W
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