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Mostrando ítems 1-10 de 13
Campos de Dirac no universo de Friedmann-Lemaitre-Robertson-Walker
(Universidade Federal de Juiz de Fora (UFJF)BrasilICE – Instituto de Ciências ExatasPrograma de Pós-graduação em FísicaUFJF, 2017)
Ecuación de desvío geodésico en la métrica Lemaître Tolman Bondi
(2012)
Haciendo uso de las soluciones exactas con simetría esférica, se estudian modelos cosmológicos inhomogéneos, se hace un análisis detallado de la solución de Lemaître Tolman Bondi (LTB) y las diferentes condiciones en que ...
The avoidance of the initial cosmological singularity by the big bounce in the early cosmology
(Universidad de los AndesFísicaFacultad de CienciasDepartamento de Física, 2020)
Uno de los problemas sobresalientes en la cosmología temprana, es el problema de la singularidad inicial que aparece en los modelos estandar de cosmología. Este problema se ve reflejado cuando el factor de escala de la ...
Cosmological wormholes in f(R) theories of gravity
(2016)
Motivated by recent proposals of possible wormhole existence in galactic halos, we analyze the cosmological evolution of wormhole solutions in modified f(R) gravity. We construct a dynamical wormhole that asymptotically ...
Inflation without inflaton: A model for dark energy
(American Physical Society, 2017-10)
The interaction between two initially causally disconnected regions of the Universe is studied using analogies of noncommutative quantum mechanics and the deformation of Poisson manifolds. These causally disconnect regions ...
Exact solution of an ekpyrotic fluid and a primordial magnetic field in an anisotropic cosmological space-time of Petrov D
(2017)
This document obtained and analyzed an exact solution of an ekpyrotic fluid (P = 5/3 µ) and a primordial magnetic field, so that the latter does not induce currents or electric fields. It is determined that the main role, ...
Pseudoinvariance and the extra degree of freedom in f (T) gravity
(American Physical Society, 2020-04)
Nonlinear generalizations of teleparallel gravity entail the modification of a Lagrangian that is pseudoinvariant under local Lorentz transformations of the tetrad field. This procedure consequently leads to the loss of ...