Can we observe fuzzballs or firewalls?

Abstract

In the fuzzball paradigm the information paradox is resolved because the black hole is replaced by an object with no horizon. One may therefore ask if observations can distinguish a traditional hole from a fuzzball. We find: (a) It is very difficult to reflect quanta off the surface of a fuzzball, mainly because geodesics starting near the horizon radius cannot escape to infinity unless their starting direction is very close to radial. (b) If infalling particles interact with the emerging radiation before they are engulfed by the horizon, then we say that we have a `firewall behavior'. We consider several types of interactions, but find no evidence for firewall behavior in any theory that obeys causality. (c) Photons with wavelengths {\it larger} than the black hole radius can be scattered off the emerging radiation, but a very small fraction of the backscattered photons will be able to escape back to infinity.

52 pages, 4 figures

References in corpus (10)

• Echoes of ECOs: gravitational-wave signatures of exotic compact objects and of quantum corrections at the horizon scale
• Tests for the existence of horizons through gravitational wave echoes
• The fuzzball proposal for black holes
• Gravity solutions for the D1-D5 system with angular momentum
• Radiation from the non-extremal fuzzball
• Pair creation in non-extremal fuzzball geometries
• Tidal Stresses and Energy Gaps in Microstate Geometries
• Collisions with Black Holes and Deconfined Plasmas
• A model with no firewall
• Spacetime has a `thickness'

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