Effects of electromagnetic field on the dynamical instability of expansionfree gravitational collapse

Details Effects of electromagnetic field on the dynamical instability of expansionfree gravitational collapse Effects of electromagnetic field on the dynamical instability of expansionfree gravitational collapse

May 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012gregr..44.1181s&link_type=abstract

General Relativity and Gravitation, Volume 44, Issue 5, pp.1181-1197

Physics

Local Anisotropy Of Pressure, Instability, Electromagnetic Field

Scientific paper

In this paper, we discuss the effects of electromagnetic field on the dynamical instability of a spherically symmetric expansionfree gravitational collapse. Darmois junction conditions are formulated by matching interior spherically symmetric spacetime to exterior Reissner-Nordström spacetime. We investigate the role of different terms in the dynamical equation at Newtonian and post Newtonian regimes by using perturbation scheme. It is concluded that instability range depends upon pressure anisotropy, radial profile of energy density and electromagnetic field, but not on the adiabatic index Γ. In particular, the electromagnetic field reduces the unstable region.

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