Proceedings of the 5th International Workshop on Astronomy and Relativistic Astrophysics (IWARA2011); João Pessoa, Brazil, 9-11 October 2011; Editors: Valdir B. Bezerra, Marcelo J. Rebouças, Dimiter Hadjimichef, Cesar A. Zen Vasconcellos, Jorge E. Horvath, and Eugênio R. Bezerra de MelloOpen Access

RASTALL COSMOLOGY

JÚLIO C. FABRIS

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

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OLIVER F. PIATTELLA

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

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DAVI C. RODRIGUES

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

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CARLOS E. M. BATISTA

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

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, and

MAHAMADOU H. DAOUDA

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

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https://doi.org/10.1142/S2010194512008227Cited by:69 (Source: Crossref)

Abstract

We review the difficulties of the generalized Chaplygin gas model to fit observational data, due to the tension between background and perturbative tests. We argue that such issues may be circumvented by means of a self-interacting scalar field representation of the model. However, this proposal seems to be successful only if the self-interacting scalar field has a non-canonical form. The latter can be implemented in Rastall's theory of gravity, which is based on a modification of the usual matter conservation law. We show that, besides its application to the generalized Chaplygin gas model, other cosmological models based on Rastall's theory have many interesting and unexpected new features.

Based on a talk presented by Júlio C. Fabris during the IWARA 2011 conference.

PACS: 04.50.Kd, 95.35.+d, 95.36.+x, 98.80.-k

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