Inflationary Models
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Aspectos clássicos da cosmologia inflacionária.
The last decades have been of major developments in cosmology since the advent of cosmological inflation as a solution to the problems of standard cosmological model. As one of the main paradigms of modern cosmology, to study the classical theory of inflation is the main objective of this work. Before, we present the main evidences of universal expansion and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/08/2011
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2. Emergence of complex spatio-temporal order in nonlinear field theories
We investigate the emergence of time-dependent nonperturbative configurations during the evolution of nonlinear scalar field models with symmetric and asymmetric double-well potentials. Complex spatio-temporal behavior emerges as the system seeks to establish equipartition after a fast quench. We show that fast quenches may dramatically modify the decay rate
Brazilian Journal of Physics. Publicado em: 2006-12
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3. Nonlinear resonance in bouncing universes
The dynamics of closed LFRW universes with a massive inflaton field is examined where Friedmann equations are corrected by the introduction of a potential term arising from quantum gravity corrections to cosmological scenarios near the singularity. This extra term implements nonsingular bounces in the early evolution of the universe. For certain windows in t
Brazilian Journal of Physics. Publicado em: 2005-12
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4. Some results on the evolution of primordial black holes
We briefly review some recent results related to thermodynamics of semiclassical black holes applied to their primordial formation. Issues on the existence of an influx of ambient particles onto the PBHs, which may help grow them, are addressed. We revisit the integrated flux from evaporated PBHs contributing to the present backgrounds and show that there pr
Brazilian Journal of Physics. Publicado em: 2005-12
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5. A dinÃmica inflacionÃria brasileira: resultados de auto-regressÃo quantÃilica
The object of study of this thesis is the Brazilian inflationary dynamics after the implementation of the Real Plan in 1994. We use quantile autoregressive models and unit root tests derived from quantile autoregressive representations to characterize such dynamics. It is shown that the inflationary dynamics is not uniform across different conditional quanti
Publicado em: 2005
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6. Cosmologia inflacionária em modelos de branas tipo RS-I / Inflationary Cosmology in RS-I Brane Models.
A cosmologia inflacionária descreve uma fase durante a qual o nosso universo passou por expansão acelerada em um curto período de tempo a escalas de altas energias. A inflação soluciona os problemas deixados pelo modelo cosmológico da Grande Explosão, tais como os problemas de planura e do horizonte. Nesta fase, o nosso universo era governado por um p
Publicado em: 2005
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7. Inflation and precision cosmology
A brief review of inflation is presented. After having demonstrated the generality of the inflationary mechanism, the emphasis is put on its simplest realization, namely the single field slow-roll inflationary scenario. Then, it is shown how, concretely, one can calculate the predictions of a given model of inflation. Finally, a short overview of the most po
Brazilian Journal of Physics. Publicado em: 2004-12
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8. Alternative dark energy models: an overview
A large number of recent observational data strongly suggest that we live in a flat, accelerating Universe composed of ~ 1/3 of matter (baryonic + dark) and ~ 2/3 of an exotic component with large negative pressure, usually named Dark Energy or Quintessence. The basic set of experiments includes: observations from SNe Ia, CMB anisotropies, large scale struct
Brazilian Journal of Physics. Publicado em: 2004-03