Information loss problem and a `black hole' model with a closed apparent horizon

Understand

In a classical description the spacetime curvature inside a black hole infinitely grows.

• In the domain where it reaches the Planckian value and exceeds it the Einstein equations should be modified.
• In the absence of reliable theory of quantum gravity it is instructive to consider simplified models.
• We assume that a spacetime curvature is limited by some value (of the order of the Planckian one).