Unification of dark energy and dark matter from diffusive cosmology

D. Benisty, E. I. Guendelman, Z. Haba

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Generalized ideas of unified dark matter and dark energy in the context of dynamical space time theories with a diffusive transfer of energy are studied. The dynamical space-time theories introduce a vector field whose equation of motion guarantees a conservation of a certain energy momentum tensor, which may be related, but in general is not the same as the gravitational energy momentum tensor. This particular energy momentum tensor is built from a general combination of scalar fields derivatives as the kinetic terms, and possibly potentials for the scalar field. By demanding that the dynamical space vector field be the gradient of a scalar the dynamical space time theory becomes a theory for diffusive interacting dark energy and dark matter. These generalizations produce nonconserved energy momentum tensors instead of conserved energy momentum tensors which lead at the end to a formulation for interacting dark energy and dark matter (DE-DM). We solved analytically the theories and we show that the ΛCDM is a fixed point of these theories at large times. A particular case has asymptotic correspondence to previously studied non-Lagrangian formulations of diffusive exchange between dark energy and dark matter.

Original languageEnglish
Article number123521
JournalPhysical Review D
Volume99
Issue number12
DOIs
StatePublished - 18 Jun 2019

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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