Rastall cosmology
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.
Cite
@article{arxiv.1205.1198,
title = {Rastall cosmology},
author = {J. C. Fabris and O. F. Piattella and D. C. Rodrigues and C. E. M. Batista and M. H. Daouda},
journal= {arXiv preprint arXiv:1205.1198},
year = {2015}
}
Comments
Latex file, 10 pages, 1 figure in eps format. Proceedings of the conference IWARA2011, 09-12 october 2011, Joao Pessoa, Brasil