Interaction of gravitational waves with strongly magnetized plasmas

Isliker, H; Sandberg, I; Vlahos, L

dc.contributor.author	Isliker, H	en
dc.contributor.author	Sandberg, I	en
dc.contributor.author	Vlahos, L	en
dc.date.accessioned	2014-03-01T01:24:31Z
dc.date.available	2014-03-01T01:24:31Z
dc.date.issued	2006	en
dc.identifier.issn	1550-7998	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17309
dc.subject	Electric Field	en
dc.subject	Gamma Ray Burst	en
dc.subject	Gravitational Wave	en
dc.subject	Linear Equations	en
dc.subject	Magnetic Field	en
dc.subject	Oscillations	en
dc.subject	Strong Magnetic Field	en
dc.subject	Time Scale	en
dc.subject	General Relativistic	en
dc.subject.classification	Astronomy & Astrophysics	en
dc.subject.classification	Physics, Particles & Fields	en
dc.subject.other	GAMMA-RAY BURSTS	en
dc.subject.other	MAGNETOSONIC WAVES	en
dc.subject.other	PARAMETRIC-EXCITATION	en
dc.subject.other	RADIATION	en
dc.subject.other	SGR-1806-20	en
dc.subject.other	MAGNETARS	en
dc.subject.other	FLARE	en
dc.title	Interaction of gravitational waves with strongly magnetized plasmas	en
heal.type	journalArticle	en
heal.identifier.primary	10.1103/PhysRevD.74.104009	en
heal.identifier.secondary	http://dx.doi.org/10.1103/PhysRevD.74.104009	en
heal.identifier.secondary	104009	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	We study the interaction of a gravitational wave (GW) with a plasma that is strongly magnetized. The GW is considered a small disturbance, and the plasma is modeled by the general relativistic analogue of the induction equation of ideal MHD and the single fluid equations. The equations are specified to two different cases, first to Cartesian coordinates and a constant background magnetic fields, and second to spherical coordinates together with a background magnetic field that decays with the inverse radial distance. The equations are derived without neglecting any of the nonlinear interaction terms, and the nonlinear equations are integrated numerically. We find that for strong magnetic fields of the order of 1015G the GW excites electromagnetic plasma waves very close to the magnetosonic mode. The magnetic and electric field oscillations have very high amplitude, and a large amount of energy is absorbed from the GW by the electromagnetic oscillations, of the order of 1023erg/cm3 in the case presented here, which, when assuming a relatively small volume in a star's magnetosphere as an interaction region, can yield a total energy of at least 1041erg and may be up to 1043erg. The absorbed energy is proportional to B02, with B0 the background magnetic field. The energizing of the plasma takes place on fast time scales of the order of milliseconds. Our results imply that the GW-plasma interaction is an efficient and important mechanism in magnetar atmospheres, most prominently close to the star, and, under very favorable conditions though, it might even be the primary energizing mechanism behind giant flares. © 2006 The American Physical Society.	en
heal.publisher	AMERICAN PHYSICAL SOC	en
heal.journalName	Physical Review D - Particles, Fields, Gravitation and Cosmology	en
dc.identifier.doi	10.1103/PhysRevD.74.104009	en
dc.identifier.isi	ISI:000242409800038	en
dc.identifier.volume	74	en
dc.identifier.issue	10	en