Proton pairing in neutron stars from chiral effective field theory
- 주제(기타) Physics, Nuclear
- 설명문(일반) [Lim, Yeunhwan] Max Planck Inst Kernphys, Saupfercheckweg 1, D-69117 Heidelberg, Germany; [Lim, Yeunhwan] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany; [Lim, Yeunhwan] GSI Helmholtzzentrum Schwerionenforsch GmbH, ExtreMe Matter Inst EMMI, D-64291 Darmstadt, Germany; [Holt, Jeremy W.] Texas A&M Univ, Cyclotron Inst, College Stn, TX 77843 USA; [Holt, Jeremy W.] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA
- 등재 SCIE, SCOPUS
- 발행기관 AMER PHYSICAL SOC
- 발행년도 2021
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000182528
- 본문언어 영어
- Published As http://dx.doi.org/10.1103/PhysRevC.103.025807
초록/요약
We study the S-1(0) 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 Bardeen-Cooper-Schrieffer theory using a single-particle dispersion relation calculated up to second order in perturbation theory. Model uncertainties are estimated by varying the nuclear potential (its order in the chiral expansion and high-momentum cutoff) 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 S-1(0) pairing gap relative to the use of a free spectrum. We estimate the critical temperature for the onset of proton superconductivity to be T-c = (3.2-5.1) x 10(9) 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.
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