Anisotropic power-law inflation for a generalized model of two scalar and two vector fields

Abstract

Cosmological implication of a generalized model of two scalar and two vector fields, in which both scalar fields are non-minimally coupled to each vector field, is studied in this paper. In particular, we will seek a set of new anisotropic power-law inflationary solutions to this model. Additionally, the stability of the obtained solutions will be examined by using the dynamical system approach. As a result, we will show that this set of solutions turns out to be stable and attractive during the inflationary phase as expected due to the existence of the unusual couplings between two scalar and two vector fields. Notably, we will point out that the existence of phantom field will lead to an instability of the corresponding anisotropic power-law inflation.

26 pages, 6 figures. Final version with some discussions and relevant references added; typos fixed. All calculations remain unchanged. Accepted for publication in Physica Scripta. Comments are welcome

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