  In recent work, two of us proposed a nonsingular Ekpyrotic cosmology making
use of an S-brane which forms at the end of the phase of Ekpyrotic contraction.
This S-Brane mediates a transition between contraction and expansion.
Graviitational waves passing through the S-Brane acquire a roughly
scale-invariant spectrum, and if the S-Brane has zero shear, then a roughly
scale-invariant spectrum of cosmological perturbatiions results. Here, we study
the production of gauge field fluctuations driven by the decay of the S-Brane,
and we show that the reheating process via gauge field production will be
efficient, leading to a radiation-dominated expanding phase.
