Internal Null Hypersurface, Modular Structure, Logical Subspace,and Global Consequences for Information in Supermassive Black Holes.

This work develops a theoretical framework in which information falling into a regular supermassive black hole is encoded on an internal null hypersurface rather than on the external horizon.Using algebraic quantum field theory and modular theory, we show that geometric regularity induces a degenerate modular generator, leading to the existence of a non-trivial internal logical subspace.We discuss the consequences for unitarity, Hawking evaporation, and the global information structure associated with a cosmological population of supermassive black holes.