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Probes and Tests of Strong-Field Gravity with Observations in the Electromagnetic Spectrum

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Author(s): Psaltis Dimitrios

Journal: Living Reviews in Relativity
ISSN 1433-8351

Volume: 11;
Start page: 9;
Date: 2008;
Original page

Keywords: Neutron stars | Black holes | Tests of relativistic gravity

ABSTRACT
Neutron stars and black holes are the astrophysical systems with the strongest gravitational fields in the universe. In this article, I review the prospect of using observations of such compact objects to probe some of the most intriguing general relativistic predictions in the strong-field regime: the absence of stable circular orbits near a compact object and the presence of event horizons around black-hole singularities. I discuss the need for a theoretical framework, within which future experiments will provide detailed, quantitative tests of gravity theories. Finally, I summarize the constraints imposed by current observations of neutron stars on potential deviations from general relativity.
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