Buscar
Mostrando ítems 1-10 de 1469
Cosmological models from string theory setups
(Universidade Estadual Paulista (Unesp), 2019-08-15)
Nesta tese, discutimos três modelos cosmológicos que são baseados direta ou indiretamente em ideias advindas de teoria das cordas. Depois de uma revisão geral de cosmologia em teoria das cordas, um resumo de cosmologia e ...
Holographic cosmology solutions of problems with pre-inflationary cosmology
(2020-12-01)
In this paper we describe in detail how to solve the problems of pre-inflationary cosmology within the holographic cosmology model of McFadden and Skenderis [1]. The solutions of the smoothness and horizon problems, the ...
Influence of small-scale inhomogeneities on the cosmological consistency tests
(WILEY-BLACKWELLHOBOKEN, 2012)
The current cosmological dark sector (dark matter plus dark energy) is challenging our comprehension about the physical processes taking place in the Universe. Recently, some authors tried to falsify the basic underlying ...
Exact solutions to Elko spinors in spatially flat Friedmann-Robertson-Walker spacetimes
(Iop Publishing Ltd, 2014-03-01)
In this paper we present exact solutions to the so-called Elko spinors for three models of expanding universe, namely the de Sitter, linear and the radiation type evolution. The study was restricted to flat, homogeneous ...
Observational constraints on holographic tachyonic dark energy in interaction with dark matter
(IOP PUBLISHING LTD, 2010)
We discuss an interacting tachyonic dark energy model in the context of the holographic principle. The potential of the holographic tachyon field in interaction with dark matter is constructed. The model results are compared ...
Cosmological Fluctuations in Delta Gravity
(2023)
About 70% of the Universe is Dark Energy, but the physics community still does not know what it is. Delta gravity (DG) is an alternative theory of gravitation that could solve this cosmological problem. Previously, we ...
Some remarks on the attractor behaviour in ELKO cosmology
(Iop Publishing Ltd, 2014-08-01)
Recent results on the dynamical stability of a system involving the interaction of the ELKO spinor field with standard matter in the universe have been reanalysed, and the conclusion is that such system does not exhibit ...
NEW COSMOLOGICAL SOLUTIONS IN MASSIVE GRAVITY THEORY
(Univ Nacional Autonoma Mexico, Inst De Astronomia, 2017-04-01)
In this paper we present some new cosmological solutions in massive gravity theory. Some homogeneous and isotropic solutions correctly describe accelerated evolutions for the universe. The study was realized considering a ...
New cosmological solutions in massive gravity theory
(2017-04-01)
In this paper we present some new cosmological solutions in massive gravity theory. Some homogeneous and isotropic solutions correctly describe accelerated evolutions for the universe. The study was realized considering a ...