Gravitomagnetic effect in magnetized neutron stars
Abstract
Rotating bodies in General Relativity produce frame dragging, also known as the {\it gravitomagnetic effect} in analogy with classical electromagnetism. In this work, we study the effect of magnetic field on the gravitomagnetic effect in neutron stars with poloidal geometry, which is produced as a result of its rotation. We show that the magnetic field has a non-negligible impact on frame dragging. The maximum effect of the magnetic field appears along the polar direction, where the frame-dragging frequency decreases with increase in magnetic field, and along the equatorial direction, where its magnitude increases. For intermediate angles, the effect of the magnetic field decreases, and goes through a minimum for a particular angular value at which magnetic field has no effect on gravitomagnetism. Beyond that particular angle gravitomagnetic effect increases with increasing magnetic field. We try to identify this `null region' for the case of magnetized neutron stars, both inside and outside, as a function of the magnetic field, and suggest a thought experiment to find the null region of a particular pulsar using the frame dragging effect.
Cite
@article{arxiv.1607.05600,
title = {Gravitomagnetic effect in magnetized neutron stars},
author = {Debarati Chatterjee and Chandrachur Chakraborty and Debades Bandyopadhyay},
journal= {arXiv preprint arXiv:1607.05600},
year = {2017}
}
Comments
LaTex; 16 pages including 17 figures, title changed, version accepted for publication in JCAP