Semiclassical black holes and horizon singularities

In spherical symmetry, solutions of the semiclassical Einstein equations belong to one two possible classes. Both classes contain that -- depending on dynamic behavior horizon describe evaporating physical black holes or expanding white (trapped/anti-trapped regions form in finite time a distant observer). These are real-valued only if null energy condition (NEC) is violated vicinity Schwarzschild sphere. We review their properties and consistent hole formation scenario. While curvature scalars outer apparent/anti-trapping horizon, it still weakly singular surface. This singularity manifests itself mild firewall. Near inner apparent NEC satisfied. Models static regular known be unstable, but since models severely constrained by self-consistency requirements, stability requires further investigation.