Rastall Cosmology and the ΛCDM Model

Details Rastall Cosmology and the ΛCDM Model Rastall Cosmology and the ΛCDM Model

2011-12-18

arxiv.org/abs/1112.4141v2

Phys. Rev. D 85, 084008 (2012)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages, 1 figure. Accepted for publication in Physical Review D

Scientific paper

10.1103/PhysRevD.85.084008

Rastall's theory is based on the non-conservation of the energy-momentum tensor. We show that, in this theory, if we introduce a two-fluid model, one component representing vacuum energy whereas the other pressureless matter (e.g. baryons plus cold dark matter), the cosmological scenario is the same as for the \Lambda CDM model, both at background and linear perturbative levels, except for one aspect: now dark energy may cluster. We speculate that this can lead to a possibility of distinguishing the models at the non-linear perturbative level.

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