Proton pairing in neutron stars from chiral effective field theory
arXiv:1709.08793 · doi:10.1103/PhysRevC.103.025807
Abstract
We study the proton pairing gap in beta-equilibrated neutron star matter within the framework of chiral effective field theory. We focus on the role of three-body forces, which strongly modify the effective proton-proton spin-singlet interaction in dense matter. We find that three-body forces generically reduce both the size of the pairing gap and the maximum density at which proton pairing may occur. The pairing gap is computed within BCS theory, and model uncertainties are estimated by varying the nuclear potential and the choice of single-particle spectrum in the gap equation. We find that a second-order perturbative treatment of the single-particle spectrum suppresses the proton pairing gap relative to the use of a free spectrum. We estimate the critical temperature for the onset of proton superconductivity to be K, which is consistent with previous theoretical results in the literature and marginally within the range deduced from a recent Bayesian analysis of neutron star cooling observations.
8 pages, 9 figures
References in corpus (27)
- Chiral effective field theory and nuclear forces
- Improved nuclear matter calculations from chiral low-momentum interactions
- Rapid Cooling of the Neutron Star in Cassiopeia A Triggered by Neutron Superfluidity in Dense Matter
- Improved chiral nucleon-nucleon potential up to next-to-next-to-next-to-leading order
- Neutron matter at next-to-next-to-next-to-leading order in chiral effective field theory
- How well do we know the neutron-matter equation of state at the densities inside neutron stars? A Bayesian approach with correlated uncertainties
- Semilocal momentum-space regularized chiral two-nucleon potentials up to fifth order
- Subleading contributions to the chiral three-nucleon force I: long-range terms
- Neutron conduction in the inner crust of a neutron star in the framework of the band theory of solids
- Strongly paired fermions: Cold atoms and neutron matter
- Superfluidity in nuclear systems and neutron stars
- Neutron matter from chiral two- and three-nucleon calculations up to NLO
- Screening Effects in Superfluid Nuclear and Neutron Matter within Brueckner Theory
- Pulsar Glitches: The Crust may be Enough
- Towards order-by-order calculations of the nuclear and neutron matter equations of state in chiral effective field theory
- Correlated density-dependent chiral forces for infinite matter calculations within the Green's function approach
- Exploring Bayesian parameter estimation for chiral effective field theory using nucleon-nucleon phase shifts
- Two-pion exchange three-nucleon potential: O(q^4) chiral expansion
- Pairing in neutron matter: New uncertainty estimates and three-body forces
- Nuclear pairing from microscopic forces: singlet channels and higher-partial waves
- On the stability of precessing superfluid neutron stars
- Proton elastic scattering on calcium isotopes from chiral nuclear optical potentials
- Pairing and short-range correlations in nuclear systems
- Implementing chiral three-body forces in terms of medium-dependent two-body forces
- Neutron elastic scattering on calcium isotopes from chiral nuclear optical potentials
- Three-nucleon forces and superfluidity in neutron matter
- Tensor Fermi liquid parameters in nuclear matter from chiral effective field theory