  Starting from the d-wave RVB mean-field theory of Kotliar and Liu, we present
a new, long-wavelength/low-energy exact, treatment of gauge fluctuations. The
result is a theory of gapless fermion quasiparticles coupled to superconducting
phase fluctuations. We will discuss the physical implications, and the
similarity/differences with a theory of BCS pairing with phase fluctuations.
