A Cosmological Model with Fermionic Field (0912.1222v1)

Abstract: In this work, a cosmological model inspired by string/M- theory with fermionic field is taken into consideration. Here it is investigated whether the introduction of a non-Dirac fermionic field--characterized by an \textit{interaction term}--affects the cosmological evolution. The self-interaction potential is considered as a combination of the scalar and pseudo-scalar invariants. It is observed that the fermionic field under consideration behaves like an inflation field for the early Universe and later on, as a dark energy field. The late time acceleration becomes more prominent by the addition of the interaction term. There is a slight decrease for the inflation peak as well as for the energy density. We see that addition of higher order terms to the fermionic part of Lagrangian does not significantly change either the inflation or the late time acceleration behavior.