New Concepts for Old Black Holes

TL;DR

The paper confronts the AMPS firewall paradox by proposing a framework in which the black hole interior is encoded as a fault-tolerant quantum message within the Hawking radiation, rather than requiring a firewall. Central to this approach are the ER=EPR connection, precursors, and timefolds, which together enable nonlocal encoding and boundary–bulk mappings that preserve complementarity while maintaining unitarity. A key contribution is the construction of a concrete coding picture, including reference systems and negative-information qubits, that explains how interior information can remain accessible to infalling observers without violating causality or leading to firewalls. The work also analyzes gauge invariance behind horizons, the role of scrambling, and a laboratory string-qubit model to illustrate easy versus hard operators, proposing that horizon dynamics can self-heal on scrambling times. Overall, the paper offers a cohesive, if speculative, route to reconciling information preservation with smooth horizons, with implications for holography, quantum error correction, and the nonlocal structure of spacetime behind black hole horizons.

Abstract

It has been argued that the AMPS paradox implies catastrophic breakdown of the equivalence principle in the neighborhood of a black hole horizon, or even the non-existence of any spacetime at all behind the horizon. Maldacena and the author suggested a different resolution of the paradox based on the close relationship between Einstein-Rosen bridges and Einstein-Podolsky-Rosen entanglement. In this paper the new mechanisms required by the proposal are reviewed: the ER=EPR connection: precursors: timefolds: and the black hole interior as a fault-tolerant, negative information message. Along the way a model of an ADS black hole as a single long-string is explained, and used to clarify the relation between Wilson loops and precursors.

Figures (31)

• Figure 1: A portion of the Penrose diagram of a Schwarzschild black hole showing a pair of entangled modes $A$ and $B.$
• Figure 2: The eternal ADS black hole is really two entangled black holes on entirely separate spaces. The entanglement is represented by and Einstein-Rosen bridge.
• Figure 3: The eternal black hole is really two entangled but non-interacting black holes. The black hole on the right side has paired exterior and interior modes $B, \ A.$ A signal can be sent from $A'$ to $A.$ The operator $A"$ is a very non-local precursor obtained by time evolution from $A'.$
• Figure 4: The earlier half of the eternal black hole history can be thought of as fictitious. The black hole is created at time $0$ in the state that would have resulted from the earlier history. If there is no operator $A'$ activated in the fictitious past then the state is the Thermofield double state.
• Figure 5: A precursor $Y$ is constructed by propagating back to an earlier local operator $X.$ The diagram is a timefold. If the precursor is applied at one time the later effect is the same as if $X$ had acted at the earlier time.