No observational proof of the black-hole event-horizon

Details No observational proof of the black-hole event-horizon No observational proof of the black-hole event-horizon

2002-07-12

arxiv.org/abs/astro-ph/0207270v1

Astron.Astrophys. 396 (2002) L31-L34

Astronomy and Astrophysics

Astrophysics

4 pages, no figures, submitted to A&A Letters

Scientific paper

10.1051/0004-6361:20021645

Recently, several ways of obtaining observational proof of the existence of black-hole horizons have been proposed. We argue here that such proof is fundamentally impossible: observations can provide arguments, sometimes very strong ones, in favour of the existence of the event horizon, but they cannot prove it. This applies also to future observations, which will trace very accurately the details of the spacetime metric of a body suspected of being a black hole.

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