B. Carazza et P. Quarati, SIMPLE APPROACH TO STUDY THE COLLAPSE OF RELATIVISTIC-PARTICLES, Nuovo cimento della Società Italiana di Fisica. A. Nuclei, particles and fields, 106(10), 1993, pp. 1353-1359
Using a semi-relativistic approach, we derive in a straightforward way
the conditions for the collapse of one charged particle of angular mo
mentum l bound to a pointlike and massive nucleus. We study also the c
ollapse of a system of identical particles interacting through a Coulo
mb or a gravitational potential.