  We add a periodic potential to the simplest gravitational model of a
superconductor and compute the optical conductivity. In addition to a
superfluid component, we find a normal component that has Drude behavior at low
frequency followed by a power law fall-off. Both the exponent and coefficient
of the power law are temperature independent and agree with earlier results
computed above $T_c$. These results are in striking agreement with measurements
on some cuprates. We also find a gap $\Delta = 4.0\ T_c$, a rapidly decreasing
scattering rate, and "missing spectral weight" at low frequency, all of which
also agree with experiments.
