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Rastall cosmology and the ΛCDM model

Carlos E. M. Batista*

Mahamadou H. Daouda†, Júlio C. Fabris‡, Oliver F. Piattella§, and Davi C. Rodrigues∥

  • Departamento de Física, Universidade Estadual de Feira de Santana, Feira de Santana, Brazil

  • Departamento de Física, Universidade Federal do Espírito Santo, Vitória, Brazil

  • *cedumagalhaes22@hotmail.com
  • †daoudah8@yahoo.fr
  • ‡fabris@pq.cnpq.br
  • §oliver.piattella@gmail.com
  • ∥davi.c.rodrigues@gmail.com
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Phys. Rev. D 85, 084008 – Published 6 April, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.084008

Abstract

Rastall’s theory is based on the nonconservation 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 ΛCDM model, both at background and linear perturbation 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 nonlinear perturbation level.

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Phys. Rev. D 85, 084008– Published 6 April, 2012
  • Received 20 December 2011

© 2012 American Physical Society

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