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Phantom-like behavior in [formula omitted]-gravity

Authors
Journal
Physics Letters B
0370-2693
Publisher
Elsevier
Publication Date
Volume
680
Issue
3
Identifiers
DOI: 10.1016/j.physletb.2009.08.066
Keywords
  • Astrophysics And Cosmology

Abstract

Abstract We investigate possible realization of the phantom-like behavior in the framework of f ( R ) -gravity models where there are no phantom fields in the matter sector of the theory. By adopting some observationally reliable ansatz for f ( R ) , we show that it is possible to realize phantom-like behavior in f ( R ) -gravity without introduction of phantom fields that suffer from instabilities and violation of the null energy condition. Depending on the choice of f ( R ) , the null energy condition is fulfilled in some subspaces of each model parameter space.

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