Small field Coleman-Weinberg inflation driven by a fermion condensate

We revisit the small-field Coleman-Weinberg inflation, which has the following two problems: First, the smallness of the slow roll parameter. requires the inflation scale to be very low. Second, the spectral index n(s) approximate to 1 + 2(eta) tends to become smaller compared to the observed value. In this paper, we consider two possible effects on the dynamics of inflation: radiatively generated nonminimal coupling to gravity xi phi R-2 and condensation of fermions coupled to the inflaton as phi(psi) over bar psi We show that the fermion condensate can solve the above problems.