Spin-polarized Neutron Matter, the Maximum Mass of Neutron Stars, and GW170817

Tews, Ingo; Schwenk, A.

doi:10.3847/1538-4357/ab7232

Title: Spin-polarized Neutron Matter, the Maximum Mass of Neutron Stars, and GW170817

Journal Article · Thu Mar 19 00:00:00 EDT 2020 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/ab7232· OSTI ID:1822725

^[1]; Schwenk, A. ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Darmstadt Univ. of Technology (Germany); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany). ExtreMe Matter Inst. (EMMI); Max Planck Inst. fuer Kernphysik, Heidelberg (Germany)

In this work, we investigate how a phase transition from neutron-star matter to spin-polarized neutron matter affects the equation of state and mass–radius relation of neutron stars. While general extension schemes for the equation of state allow for high pressures inside neutron stars, we find that a phase transition to spin-polarized neutron matter excludes extreme regimes. Hence, such a transition limits the maximum mass of neutron stars that lie below 2.6–2.9 M_⊙, depending on the microscopic nuclear forces used, while significantly larger masses could be reached without these constraints. Furthermore, these limits are in good agreement with recent constraints extracted from the neutron-star merger GW170817 and its electromagnetic counterpart. Assuming the description in terms of spin-polarized neutron matter to be valid in the center of neutron stars, we find that stars with a large spin-polarized domain in their core are ruled out by GW170817.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: 89233218CNA000001; AC52-06NA25396

OSTI ID:: 1822725

Report Number(s):: LA-UR-19-27912; TRN: US2214495

Journal Information:: The Astrophysical Journal (Online), Vol. 892, Issue 1; ISSN 1538-4357

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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