On the Mass Function at the Inner Horizon of a Regular Black Hole

Calculations of the inner mass function Hayward regular black hole with fluxes are reviewed and rederived. We present detailed calculations in two forms Ori approach (the ingoing flux is continuous, outgoing modeled by a thin null shell) compare them Reissner–Nordström hole. A formal reason different results discussed. The energy density scalar perturbations propagating from event horizon into measured free falling observer near calculated.