A Cosmological Model with Fermionic Field and Gauss-Bonnet Term

Details A Cosmological Model with Fermionic Field and Gauss-Bonnet Term A Cosmological Model with Fermionic Field and Gauss-Bonnet Term

2009-10-20

arxiv.org/abs/0910.3761v1

Int.J.Mod.Phys.A25:1267-1278,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 9 figures, Submitted to IJMP-A

Scientific paper

10.1142/S0217751X10047749

In this work, a cosmological model inspired by string theory with Gauss-Bonnet term coupled to the fermionic field is taken into consideration. The self-interaction potential is considered as a combination of the scalar and pseudo-scalar invariants. Here the cosmological contribution of the coupling of Gauss-Bonnet term with a non-Dirac fermionic field--characterized by an \textit{interaction term}$L_{DG} ^2$-- is investigated. It is observed that the new type of coupling plays a significant role in the accelerating behavior of the universe. Specifically, in addition to the late time acceleration for the universe, $L_{DG} ^2$ produces an early decelerating behavior. The behavior of the equation-of-state parameter $(w)$ is such that it guarantees the stability of the theory.

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