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Résumé |
Information may or may not be lost in black hole evaporation. I will discuss possible physical consequences
of this alternative from the perspective of asymptotic observers away from the hole. To this aim, I will
describe the relationship between radiated energy and entanglement entropy of massless fields at future
null infinity (the "Page curve") in two-dimensional models of gravitational collapse and subsequent black
hole evaporation. I will then use this framework to show that, if “information is preserved” and
backscattering can be neglected, then (i) the mass of the hole cannot decrease monotonically, and (ii)
purification cannot be fast/burst-like. I will discuss some recent proposals for nonsingular evaporation in
light of these results. |
