Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-01-27
Astronomy and Astrophysics
Astrophysics
roberts@host1.swosu.edu - Submitted to PASP
Scientific paper
Proof that black holes exist will likely require confirmation of the existence of event horizons. The common assumption that the mere existence of large compact masses proves the case for black holes is an unwarranted extrapolation of General Relativity into a strong-field regime where it has not been adequately tested. Neither the large compact masses of galactic nuclei nor the massive compact objects of stellar mass in the x-ray binaries prove the existence of black holes. In contrast to the case for galactic nuclei, we have the necessary tools for obtaining either proof or disproof of event horizons in the x-ray binaries. Observations of kHz QPOs may decide the event horizon issue very quickly. If not, we can still obtain proof by comparing predictions of gravity theories that differ primarily by the presence or absence of an event horizon. Detailed analysis of models of x-ray binaries would then decide the issue.
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