Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-03-29
Phys.Rev. D75 (2007) 024020
Astronomy and Astrophysics
Astrophysics
13 pages, 13 figures, paper accepted
Scientific paper
10.1103/PhysRevD.75.024020
The time evolution of a set of 22 Mo unstable charged stars that collapse is computed integrating the Einstein-Maxwell equations. The model simulate the collapse of an spherical star that had exhausted its nuclear fuel and have or acquires a net electric charge in its core while collapsing. When the charge to mass ratio is Q/M >= 1 the star do not collapse and spreads. On the other hand, it is observed a different physical behavior with a charge to mass ratio 1 > Q/ M > 0.1. In this case, the collapsing matter forms a bubble enclosing a lower density core. We discuss an immediate astrophysical consequence of these results that is a more efficient neutrino trapping during the stellar collapse and an alternative mechanism for powerful supernova explosions. The outer space-time of the star is the Reissner-Nordstrom solution that match smoothly with our interior numerical solution, thus the collapsing models forms Reissner-Nordstrom black holes.
Ghezzi Cristian R.
Letelier Patricio S.
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