The Subtle Unphysical Hypothesis of the Firewall Theorem

Carlo Rovelli (1)

1 CPT - Centre de Physique Théorique - UMR 7332

The black-hole firewall theorem derives a suspicious consequence (large energy-momentum density at the horizon of a black hole) from a set of seemingly reasonable hypotheses. I point out the hypothesis that is likely to be unrealistic (a hypothesis not always sufficiently made explicit) and discuss the subtle confusion at its origin: mixing-up of two different notions of entropy and misusing the entropy bound.

Mots clés: black hole entropy; information paradox; entropy; black hole: entropy; black hole: horizon; energy-momentum: density; information theory

Domaines: Relativité Générale et Cosmologie Quantique [gr-qc]

Carlo Rovelli. The Subtle Unphysical Hypothesis of the Firewall Theorem. Entropy, 2019, 21 (9), pp.839. ⟨10.3390/e21090839⟩. ⟨hal-02051426⟩