[Prex] Probe and Prejudice: Classification of compact objects and model comparison using EOS knowledge

[Jay Benesch]

PREX and CREX discussion near the end

https://arxiv.org/abs/2407.07837

Hauke Koehn, Thibeau Wouters, Henrik Rose, Peter T. H. Pang, Rahul 
Somasundaram, Ingo Tews, Tim Dietrich

Nuclear theory and experiments, alongside astrophysical observations, 
constrain the equation of state (EOS) of supranuclear-dense matter. 
Conversely, knowledge of the EOS allows an improved interpretation of 
nuclear or astrophysical data. In this article, we use several 
established constraints on the EOS and the new NICER measurement of PSR 
J0437-4715 to comment on the nature of the primary companion in GW230529 
and the companion of PSR J0514-4002E. We find that, with a probability 
of ≳84% and ≳68%, respectively, both objects are black holes. These 
likelihoods increase to above 95% when one uses GW170817's remnant as an 
upper limit on the TOV mass. We also demonstrate that the current 
knowledge of the EOS substantially disfavors high masses and radii for 
PSR J0030+0451, inferred recently when combining NICER with XMM-Newton 
background data and using particular hot-spot models. Finally, we also 
use our obtained EOS knowledge to comment on measurements of the nuclear 
symmetry energy, finding that the large value predicted by the PREX-II 
measurement displays some mild tension with other constraints on the EOS.

Comments:	14 pages, 5 figures, comments welcome
Subjects:	High Energy Astrophysical Phenomena (astro-ph.HE); General 
Relativity and Quantum Cosmology (gr-qc); Nuclear Experiment (nucl-ex); 
Nuclear Theory (nucl-th)
Report number:	LA-UR-24-25688, INT-PUB-24-026
Cite as:	arXiv:2407.07837 [astro-ph.HE]
  	(or arXiv:2407.07837v1 [astro-ph.HE] for this version)