Gravitational repulsion of spherical domain walls

It is shown that the equations of motion and Tolman's formula require reverse flow of time on a spherical domain wall. Moreover, the active gravitational mass of the wall becomes negative. The critical mass and radius of a bubble are found for realistic models.Institute of Physics, Georgian Academy of Sciences. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 100, No. 2, pp. 303–311, August, 1994.