Beyond BCS pairing in high-density neutron matter

Pairing gaps in neutron matter need to be computed in a wide range of densities to address open questions in neutron star phenomenology. Traditionally, the Bardeen-Cooper-Schrieffer approach has been used to compute gaps from bare nucleon-nucleon interactions. Here, we incorporate the influence of s...

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Bibliographic Details
Published in:Journal of physics. Conference series 2018-01, Vol.940 (1), p.12014
Main Authors: Rios, A., Ding, D., Dussan, H., Dickhoff, W. H., Witte, S. J., Polls, A.
Format: Article
Language:English
Subjects:
Cassiopeia A
Correlation
Density
Neutron stars
Neutrons
Nucleon-nucleon interactions
Phenomenology
Physics
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Summary:Pairing gaps in neutron matter need to be computed in a wide range of densities to address open questions in neutron star phenomenology. Traditionally, the Bardeen-Cooper-Schrieffer approach has been used to compute gaps from bare nucleon-nucleon interactions. Here, we incorporate the influence of short- and long-range correlations into pairing properties. Short-range correlations are treated including the appropriate fragmentation of single-particle states, and they suppress the gaps substantially. Long-range correlations dress the pairing interaction via density and spin modes, and provide a relatively small correction. We use three different interactions as a starting point to control for any systematic effects. Results are relevant for neutron-star cooling scenarios, in particular in view of the recent observational data on Cassiopeia A.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/940/1/012014