Is the firewall consistent?: Gedanken experiments on black hole complementarity and firewall proposal

Understand

In this paper, we discuss the black hole complementarity and the firewall proposal at length.

• Black hole complementarity is inevitable if we assume the following five things: unitarity, entropy-area formula, existence of an information observer, semi-classical quantum field theory for an asymptotic observer, and the general relativity for an in-falling observer.
• However, large N rescaling and the AMPS argument show that black hole complementarity is inconsistent.
• To salvage the basic philosophy of the black hole complementarity, AMPS introduced a firewall around the horizon.