Nuclear and Hybrid Equations of State in Light of the Low-Mass Compact Star in HESS J1731-347
arXiv:2302.02989 · doi:10.1103/PhysRevC.108.025806
Abstract
We sample over relativistic mean-field theories constrained by chiral effective field theory and properties of isospin-symmetric nuclear matter and test them against known stellar structure constraints. This includes a recent mass and radius measurement of a compact object in supernova remnant HESS J1731-347, with an unusually low mass of and a compact radius of km. We show that none of the sampled nuclear models meet all constraints at the credibility level, but that hybrid equations of state with a quark matter inner core and nuclear outer core easily can. This indicates a tension between astrophysical constraints and low-energy nuclear theory.
arXiv comment7 pages, 3 figures, version to appear in PRC, minor changes
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