  The direct URCA process of rapid neutrino emission can occur in nonuniform
nuclear pasta phases that are expected in the inner crust of neutron stars.
Here, the periodic potential for a nucleon in nuclear pasta allows momentum
conservation to be satisfied for direct URCA reactions. We improve on earlier
work by modeling a rich variety of pasta phases (gnocchi, waffle, lasagna, and
anti-spaghetti) with large-scale molecular dynamics simulations. We find that
the neutrino luminosity due to direct URCA reactions in nuclear pasta can be 3
to 4 orders of magnitude larger than that from the modified URCA process in the
NS core. Thus neutrino radiation from pasta could dominate radiation from the
core and this could significantly impact the cooling of neutron stars
