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Research paper by

Andrea Maselli, Leonardo Gualtieri, Paolo Pani, Luigi Stella, Valeria Ferrari

Indexed on

10th Feb 2015

Published on

10th Feb 2015

Published in

arXiv - Astrophysics - High Energy Astrophysical Phenomena

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Go to sourceQuasi-Periodic Oscillations (QPOs) observed in the X-ray flux emitted by accreting black holes, are associated to phenomena occurring near the horizon. Future very large area X-ray instruments will be able to measure QPO frequencies with very high precision, thus probing this strong-field region. By using the relativistic precession model, we show the way in which QPO frequencies could be used to test general relativity against those alternative theories of gravity which predict deviations from the classical theory in the strong-field regime. We consider one of the best motivated strong-curvature corrections to general relativity, namely the Einstein-Dilaton-Gauss-Bonnet theory, and show that a detection of QPOs with the expected sensitivity of the proposed ESA M-class mission LOFT would set the most stringent constraints on the parameter space of this theory.