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SUMMARY:Quantum transparency and decoherence of near-extremal black holes
DTSTART:20260618T123000Z
DTEND:20260618T133000Z
DTSTAMP:20260531T144000Z
UID:indico-event-1847@indico.dfa.unipd.it
DESCRIPTION:Speakers: Stefano Trezzi (Institut de Ciències del Cosmos\, U
 niversitat de Barcelona)\n\nIt has recently been understood that the near-
 horizon geometry of near-extremal black holes undergoes large quantum fluc
 tuations\, signaling a breakdown of semiclassical gravity. Remarkably\, th
 ese large quantum gravity effects are controllable and happen at curvature
 s far below the Planck scale.I will describe three ways of probing these l
 arge quantum fluctuations. First\, black holes sufficiently close to extre
 mality become transparent to low-frequency electromagnetic and gravitation
 al radiation of fixed helicity\, due to a spin-induced energy gap that for
 bids absorption below a frequency threshold. Second\, this gap modifies th
 e Danielson–Satishchandran–Wald decoherence effect: the decoherence ra
 te induced by near-extremal black holes on quantum superpositions in their
  exterior can vanish identically\, and even above the gap\, coherence exce
 eds semiclassical predictions. Third\, I will discuss the quantum deformab
 ility of near-extremal black holes—their quantum Love numbers—as a fur
 ther probe of this structure.\n\nhttps://indico.dfa.unipd.it/event/1847/
URL:https://indico.dfa.unipd.it/event/1847/
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