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New kind of echo from quantum black holes
Journal
Physical Review D
ISSN
24700010
Date Issued
2022-03-15
Author(s)
Manikandan, Sreenath K.
Rajeev, Karthik
Abstract
We propose that a quantum black hole can produce a new kind of late-time gravitational echoes, facilitated by a near-horizon process analogous to Andreev reflection in condensed matter systems. In comparison to the traditional echo scenarios where the near-horizon region is treated as an ordinary reflector, we argue that, consequent to near-horizon gravitational scattering, this region is better described by an Andreev reflector. Such interactions lead to a novel contribution to gravitational echoes with a characteristic phase difference, an effect which is analogous to how Andreev reflections lead to propagating particlelike and holelike components with a relative phase in certain condensed matter scenarios. Moreover, this novel contribution to the echo signal encodes information about the "near-horizon quantum state,"hence offering a possible new window to probe the quantum nature of black holes.
Volume
105
Publication link