Oscillations of highly magnetized nonrotating neutron stars
Abstract
Highly magnetized neutron stars are promising candidates to explain some of the most peculiar astronomical phenomena, for instance, fast radio bursts, gammaray bursts, and superluminous supernovae. Pulsations of these highly magnetized neutron stars are also speculated to produce detectable gravitational waves. In addition, pulsations are important probes of the structure and equation of state of the neutron stars. The major challenge in studying the pulsations of highly magnetized neutron stars is the demanding numerical cost of consistently solving the nonlinear Einstein and Maxwell equations under minimum assumptions. With the recent breakthroughs in numerical solvers, we investigate pulsation modes of nonrotating neutron stars which harbour strong purely toroidal magnetic fields of 10^{15−17} G through twodimensional axisymmetric generalrelativistic magnetohydrodynamics simulations. We show that stellar oscillations are insensitive to magnetization effects until the magnetic to binding energy ratio goes beyond 10%, where the pulsation mode frequencies are strongly suppressed. We further show that this is the direct consequence of the decrease in stellar compactness when the extreme magnetic fields introduce strong deformations of the neutron stars.
 Publication:

Communications Physics
 Pub Date:
 December 2022
 DOI:
 10.1038/s4200502201112w
 arXiv:
 arXiv:2303.05684
 Bibcode:
 2022CmPhy...5..334L
 Keywords:

 Astrophysics  High Energy Astrophysical Phenomena
 EPrint:
 Communications Physics volume 5, Article number: 334 (2022)