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Rastall Cosmology and the Λ CDM Model

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arxiv 1112.4141 v2 pith:WYQAWKU3 submitted 2011-12-18 astro-ph.CO gr-qc

Rastall Cosmology and the Λ CDM Model

Carlos E. M. Batista , Mahamadou H. Daouda , J\'ulio C. Fabris , Oliver F. Piattella , Davi C. Rodrigues This is my paper
classification astro-ph.CO gr-qc
keywords modeldarkenergylambdamatterperturbativerastalltheory
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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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