GW170817, general relativistic magnetohydrodynamic simulations, and the neutron star maximum mass
Abstract
Recent numerical simulations in general relativistic magnetohydrodynamics (GRMHD) provide useful constraints for the interpretation of the GW170817 discovery. Combining the observed data with these simulations leads to a bound on the maximum mass of a cold, spherical neutron star (the TOV limit): M_{max}^{sph}≲2.74 /β , where β is the ratio of the maximum mass of a uniformly rotating neutron star (the supramassive limit) over the maximum mass of a nonrotating star. Causality arguments allow β to be as high as 1.27, while most realistic candidate equations of state predict β to be closer to 1.2, yielding M_{max}^{sph} in the range 2.16  2.28 M_{☉} . A minimal set of assumptions based on these simulations distinguishes this analysis from previous ones, but leads a to similar estimate. There are caveats, however, and they are enumerated and discussed. The caveats can be removed by further simulations and analysis to firm up the basic argument.
 Publication:

Physical Review D
 Pub Date:
 January 2018
 DOI:
 10.1103/PhysRevD.97.021501
 arXiv:
 arXiv:1711.00473
 Bibcode:
 2018PhRvD..97b1501R
 Keywords:

 Astrophysics  High Energy Astrophysical Phenomena;
 General Relativity and Quantum Cosmology
 EPrint:
 6 pages, 1 figure. Matches published version