A self-consistent mode coupling model for supercooled fluids is derive
d from fluctuating nonlinear hydrodynamics (extended to short waveleng
ths) with attention to detailed balance constraints. The sharp glass t
ransition predicted by mode coupling models based only on pressure non
linearities does not occur here. Instead, the long time asymptotic beh
avior of the density autocorrelation function is determined by additio
nal nonlinearities imposed by the detailed balance constraints.