Many-body approximations to the superfluid gap and critical temperature in pure neutron matter

We compute singlet pairing gaps and critical temperatures in pure neutron matter with different many-body approximations. Medium effects tend to reduce compared the standard BCS ansatz. In mean-field approximation, ratio of these two quantities remains constant across a wide range densities. This is close universal prediction theory, whether three-neutron interactions are included or not. Using more sophisticated approach that incorporates effect short-range correlations properties, we find gap temperature low-density regime substantially larger than prediction, independently interaction. this region, our results relatively experiments theoretical calculations from unitary Fermi gas. also evidence for density dependence zero-temperature matter.