Dynamics of Brans-Dicke cosmology with varying mass fermions

Abstract

In this paper, the cosmological dynamics of Brans-Dicke theory in which there are fermions with a coupling to BD scalar field as well as a self-interaction potential is investigated. The conditions that there exists a solution which is stable and represents a late-time accelerated expansion of the universe are found. The variable mass of fermions can not vanish exactly during the evolution of the universe once it exists initially. It is shown that the late-time acceleration depends completely on the self-interaction of the fermionic field if our investigation is restricted to the theory with positive BD parameter $\omega$. Provided a negative $\omega$ is allowed, there will be another two class of stable solutions describing late-time accelerated expansion of the universe.

v1: 12 pages, 5 figures; v2: 7 two-column Revtex4 pages, 5 figures, some expressions improved, typos corrected, some references added, main conclusion unchanged, to appear in PRD

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• Space-time evolution induced by spinor fields with canonical and non-canonical kinetic terms