Pairing in high-density neutron matter including short- and long-range correlations

Abstract

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 in the pairing gaps. Short-range correlations are treated including the appropriate fragmentation of single-particle states, and substantially suppress the gaps. Long-range correlations dress the pairing interaction via density and spin modes, and provide a relatively small correction. We use different interactions, some with three-body forces, 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.

Final published version. 18 pages, 14 figures, 2 tables. Includes preliminary comments and figure on three-neutron force effects

References in corpus (21)

• Rapid Cooling of the Neutron Star in Cassiopeia A Triggered by Neutron Superfluidity in Dense Matter
• Thermodynamics of the BCS-BEC crossover
• Models of Pulsar Glitches
• Momentum sharing in imbalanced Fermi systems
• Inclusive quasi-elastic electron-nucleus scattering
• Crustal Entrainment and Pulsar Glitches
• Overview of Neutron-Proton Pairing
• Screening Effects in Superfluid Nuclear and Neutron Matter within Brueckner Theory
• Tests of the nuclear equation of state and superfluid and superconducting gaps using the Cassiopeia A neutron star
• Correlated density-dependent chiral forces for infinite matter calculations within the Green's function approach
• Pinning down the superfluid and measuring masses using pulsar glitches
• Effective pairing interactions with isospin density dependence
• Mixed-Spin Pairing Condensates in Heavy Nuclei
• In medium T-matrix for nuclear matter with three-body forces - binding energy and single particle properties
• Nucleon momentum distributions, their spin-isospin dependence and short-range correlations
• Nuclear pairing from microscopic forces: singlet channels and higher-partial waves
• Superfluid Response and the Neutrino Emissivity of Neutron Matter
• Role of nucleonic Fermi surface depletion in neutron star cooling
• BCS-BEC crossovers and unconventional phases in dilute nuclear matter
• Self-consistent Green's functions with three-body forces
• ${}^1{S}_0$ pairing for neutrons in dense neutron matter induced by a soft pion

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• Microscopic Study of ${}^1{S}_0$ Superfluidity in Dilute Neutron Matter
• Cooling of hybrid neutron stars with microscopic equations of state
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• Nambu-Covariant Many-Body Theory I: Perturbative Approximations
• Non-analytic behavior of the relativistic r-modes in slowly rotating neutron stars
• Isospin-Asymmetry Dependence of the Thermodynamic Nuclear Equation of State in Many-Body Perturbation Theory
• XMM-Newton observations of PSR J0554+3107: pulsing thermal emission from a cooling high-mass neutron star
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• Neutron Star Equation of State with Nucleon Short-Range Correlations: A Concise Review and Open Issues