Por favor, use este identificador para citar o enlazar este ítem: http://repositoriodigital.ipn.mx/handle/123456789/11417
Título : ASYMPTOTIC PROPERTIES OF A SUPPOSEDLY REGULAR (DIRAC-BORN-INFELD) MODIFICATION OF GENERAL RELATIVITY
Palabras clave : modified gravity
gravity
alternatives to inflation
physics of the early universe
Fecha de publicación : 16-ene-2013
Editorial : IOP PUBLISHING
Descripción : We apply the dynamical systems tools to study the asymptotic properties of a cosmological model based on a non-linear modification of General Relativity in which the standard Einstein-Hilbert action is replaced by one of Dirac-Born-Infeld type. It is shown that the dynamics of this model is extremely rich: there are found equilibrium points in the phase space that can be associated with matter-dominated, matter-curvature scaling, de Sitter, and even phantom-like solutions. Depending on the value of the overall parameters the dynamics in phase space can show multi-attractor structure into the future (multiple future attractors may co-exist). This is a consequence of bifurcations in control parameter space, showing strong dependence of the model’s dynamical properties on the free parameters. Contrary to what is expected from non-linear modifications of general relativity of this kind, removal of the initial spacetime singularity is not a generic feature of the corresponding cosmological model. Instead, the starting point of the cosmic dynamics — the past attractor in the phase space — is a state of infinitely large value of the Hubble rate squared, usually associated with the big bang singularity.
Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada — Legaria del IPN. Departamento de Fısica, Universidad Central de Las Villas,Santa Clara, Cuba. Departamento de Fısica y Matematicas,Centro Universitario de Ciencias Exactas e Ingenierıas, Universidad de Guadalajara. Division de Ciencias e Ingenierıa de la Universidad de Guanajuato.
URI : http://www.repositoriodigital.ipn.mx/handle/123456789/11417
Otros identificadores : 1475-7516
http://hdl.handle.net/123456789/934
Aparece en las colecciones: Doctorado

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