Dynamics of a spherically symmetric inhomogeneous coupled dark energy model with coupling term proportional to non relatvistic matter


Por: Izquierdo, German, Blanquet-Jaramillo, Roberto C., Sussman, Roberto A.

Publicada: 1 ene 2018
Categoría: Physics and astronomy (miscellaneous)

Resumen:
The quasi-local scalar variables approach is applied to a spherically symmetric inhomogeneous Lemaître–Tolman–Bondi metric containing a mixture of non-relativistic cold dark matter and coupled dark energy with constant equation of state. The quasi-local coupling term considered is proportional to the quasi-local cold dark matter energy density and a quasi-local Hubble factor-like scalar via a coupling constant a. The autonomous numerical system obtained from the evolution equations is classified for different choices of the free parameters: the adiabatic constant of the dark energy w and a. The presence of a past attractor in a non-physical region of the energy densities phase-space of the system makes the coupling term non physical when the energy flows from the matter to the dark energy in order to avoid negative values of the dark energy density in the past. On the other hand, if the energy flux goes from dark energy to dark matter, the past attractor lies in a physical region. The system is also numerically solved for some interesting initial profiles leading to different configurations: an ever expanding mixture, a scenario where the dark energy is completely consumed by the non-relativistic matter by means of the coupling term, a scenario where the dark energy disappears in the inner layers while the outer layers expand as a mixture of both sources, and, finally, a structure formation toy model scenario, where the inner shells containing the mixture collapse while the outer shells expand. © 2017, Springer Science+Business Media, LLC, part of Springer Nature.

Filiaciones:
Izquierdo, German:
 Facultad de Ciencias, Universidad Autónoma del Estado de México, Instituto Literario 100, Toluca, Estado de México, Mexico

 Univ Autonoma Estado Mexico, Fac Ciencias, Inst Literario 100, Toluca 5000, Estado De Mexic, Mexico

Blanquet-Jaramillo, Roberto C.:
 Facultad de Ciencias, Universidad Autónoma del Estado de México, Instituto Literario 100, Toluca, Estado de México, Mexico

 Univ Autonoma Estado Mexico, Fac Ciencias, Inst Literario 100, Toluca 5000, Estado De Mexic, Mexico

Sussman, Roberto A.:
 Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México (ICN-UNAM), A. P. 70-543, México, D.F., Mexico

 Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, AP 70-543, Mexico City 04510, DF, Mexico
ISSN: 00017701
Editorial
SPRINGER/PLENUM PUBLISHERS, 233 SPRING ST, NEW YORK, NY 10013 USA, Estados Unidos America
Tipo de documento: Article
Volumen: 50 Número: 1
Páginas:
WOS Id: 000422697900001

MÉTRICAS