80 04 v 1 2 A ug 1 99 6 DIMENSIONALLY CONTINUED OPPENHEIMER - SNYDER GRAVITATIONAL COLLAPSE . I – SOLUTIONS IN EVEN DIMENSIONS

ar X iv : h ep - p h / 97 07 53 6 v 2 4 A ug 1 99 7 UAB – FT – 421 July 1997 Gravitinos from Gravitational Collapse

We reanalyse the limits on the gravitino mass m 3/2 in superlight gravitino scenarios derived from arguments on energy-loss during gravitational collapse. We conclude that the mass range 10 −6 eV ≤ m 3/2 ≤ 2.3 × 10 −5 eV is excluded by SN1987A data. In terms of the scale of supersymmetry breaking Λ, the range 70GeV ≤ Λ ≤ 300GeV is not allowed.

Shock-Wave Solutions of the Einstein Equations." The Oppenheimer-Snyder Model of Gravitational Collapse Extended to the Case of Non-Zero Pressure

v 1 1 8 A ug 1 99 9 Non - Riemannian cosmic walls from gravitational collapse

Two classes of metrics obtained from non-Riemannian gravitational collapse are presented.The first is the Taub planar symmetric exact solutions of Einstein-Cartan field equations of gravity describing torsion walls which are obtained from gravitational collapse of time dependent perturbation of Riemannian Taub symmetric solutions of General Relativity.The second is a modification of the Vilenki...

Non-occurrence of Trapped Surfaces and Black Holes in Spherical Gravitational Collapse: An Abridged Version

By using the most general form of Einstein equations for General Relativistic (GTR) spherical collapse of an isolated fluid having arbitrary equation of state and radiation transport properties, we show that they obey a Global Constraint, 2GM(r, t)/R(r, t)c2 ≤ 1, where R is the “invariant circumference radius”, t is the comoving time, and M(r, t) is the gravitational mass enclosed within a como...

ar X iv : g r - qc / 9 90 20 08 v 1 2 F eb 1 99 9 The Inner Structure of Black Holes

We study the gravitational collapse of a self-gravitating charged scalar-field. Starting with a regular spacetime, we follow the evolution through the formation of an apparent horizon, a Cauchy horizon and a final central singularity. We find a null, weak, mass-inflation singularity along the Cauchy horizon, which is a precursor of a strong, spacelike singularity along the r = 0 hypersurface. T...