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We discuss the properties of the previously constructed model of aSchwarzschild black hole interior where the singularity is replaced by aregular bounce, ultimately leading to a white hole. The model is semiclassicalin nature and uses as a source of gravity the effective stress-energy tensor(SET) corresponding to vacuum polarization of quantum fields, and a minimumspherical radius is a few orders of magnitude larger than the Planck length, sothat the effects of quantum gravity should be still negligible. We estimate theother quantum contributions to the effective SET, caused by a nontrivialtopology of spatial sections and particle production from vacuum due to anonstationary gravitational field and show that these contributions arenegligibly small as compared to the SET due to vacuum polarization. The same isshown for such classical phenomena as accretion of different kinds of matter tothe black hole and its further motion to the would-be singularity. Thus, in aclear sense, our model of a semiclassical bounce instead of a Schwarzschildsingularity is stable under both quantum and classical perturbations.

Matter accretion versus semiclassical bounce in Schwarzschild interior