Resonant and non-resonant amplification of massless gauge fields during an oscillating dilaton phase

Abstract

The resonant and non-resonant amplification of electromagnetic inhomogeneities is investigated within a phase of coherent dilaton oscillations. We show, in some explicit toy model, how the critical energy density bound applied to the amplified fluctuations of the massless gauge fields can constrain the dilaton mass.

Comments: 16 A4 pages in Latex style plus four figures combined into an eps file