Quantum Nature of Black Holes: Fast Scrambling versus Echoes
arXiv:1906.02653 · doi:10.1007/JHEP04(2020)136
Abstract
Two seemingly distinct notions regarding black holes have captured the imagination of theoretical physicists over the past decade: First, black holes are conjectured to be fast scramblers of information, a notion that is further supported through connections to quantum chaos and decay of mutual information via AdS/CFT holography. Second, black hole information paradox has motivated exotic quantum structure near horizons of black holes (e.g., gravastars, fuzzballs, or firewalls) that may manifest themselves through delayed gravitational wave echoes in the aftermath of black hole formation or mergers, and are potentially observable by LIGO/Virgo observatories. By studying various limits of charged AdS/Schwarzschild black holes we show that, if properly defined, the two seemingly distinct phenomena happen on an identical timescale of log(Radius)/. We further comment on the physical interpretation of this coincidence and the corresponding holographic interpretation of black hole echoes.
arXiv comment36 pages, 7 figures, added references, added discussion in section 5.2 on choice of minimal perturbation to a black hole with supplementary appendices, published in JHEP
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