DYNAMICS AND COLLISION OF MASSIVE SHELLS IN CURVED BACKGROUNDS

We analyse the dynamics of the collision of two spherical massive shel ls in a generally spherically symmetric background, obtaining an expre ssion from the conservation law that imposes a constraint between the different parameters involved. We study the light-like limit and make some comparisons of the predictions of our master equation with the re sults obtained in the case of collision of light-like shells, like the short life of white holes or the mass-inflation phenomena. We present some particular cases of the constraint equation.