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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/185598
Many-body approximations to the superfluid gap and critical temperature in pure neutron matter
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We compute singlet pairing gaps and critical temperatures in pure neutron matter with different many-body approximations. Medium effects tend to reduce gaps and critical temperatures compared to the standard BCS ansatz. In the mean-field approximation, the ratio of these two quantities remains constant across a wide range of densities. This constant ratio is close to the universal prediction of BCS theory, whether three-neutron interactions are included or not. Using a more sophisticated many-body approach that incorporates the effect of short-range correlations in pairing properties, we find that the gap to critical temperature ratio in the low-density regime is substantially larger than the BCS prediction, independently of the interaction. In this region, our results are relatively close to experiments and theoretical calculations from the unitary Fermi gas. We also find evidence for a different density dependence of zero-temperature gaps and critical temperatures in neutron matter.
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DRISSI, Mehdi and RIOS HUGUET, Arnau. Many-body approximations to the superfluid gap and critical temperature in pure neutron matter. European Physical Journal A. 2022. Vol. 58, num. 90. ISSN 1434-6001. [consulted: 10 of August of 2026]. Available at: https://hdl.handle.net/2445/185598