A signature for the absence of event horizons
J. Barbieri, G. Chapline

TL;DR
This paper proposes that a specific gamma-ray spectral feature below 70 MeV could definitively indicate the presence of a physical surface on compact objects, challenging the existence of event horizons and enabling empirical Planck-scale physics studies.
Contribution
It introduces a novel observational signature to distinguish objects with surfaces from black holes with event horizons.
Findings
A spectral dip below 70 MeV signals a physical surface.
Observation of this feature would confirm the absence of an event horizon.
This approach provides a new method to study Planck-scale physics empirically.
Abstract
A sharp dip in the spectrum of gamma rays coming from compact objects below 70 MeV would be an unambiguous signal that compact astrophysical objects have a physical surface, and there is no event horizon. Observation of this effect would open a window for the empirical study of Planck scale physics
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