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Geodesic Models of Quasi-periodic-oscillations as Probes of Quadratic Gravity

Andrea MaselliTheoretical Astrophysics, Eberhard Karls University of Tuebingen, Tuebingen, D-72076, GermanyPaolo PaniDipartimento di Fisica, "Sapienza" Università di Roma, Piazzale Aldo Moro 5, I-00185, Roma, ItalyR. CotestaMax Planck Institute for Gravitational Physics (Albert Einstein Institute), Am Mhlenberg 1, Potsdam, D-14476, GermanyLeonardo GualtieriSezione INFN Roma1, Piazzale Aldo Moro 5, I-00185, Roma, ItalyValeria FerrariDipartimento di Fisica, "Sapienza" Università di Roma, Piazzale Aldo Moro 5, I-00185, Roma, ItalyL. StellaINAF-Osservatorio Astronomico di Roma, via Frascati 33, I-00078, Monteporzio Catone, Roma, Italy

2017en

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ABI

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Abstract Future very-large-area X-ray instruments (for which the effective area is larger than m 2 ) will be able to measure the frequencies of quasi-periodic oscillations (QPOs) observed in the X-ray flux from accreting compact objects with sub-percent precision. If correctly modeled, QPOs can provide a novel way to test the strong-field regime of gravity. By using the relativistic precession model and a modified version of the epicyclic resonance model, we develop a method to test general relativity against a generic class of theories with quadratic curvature corrections. With the instrumentation being studied for future missions such as eXTP, LOFT, or STROBE-X, a measurement of at least two QPO triplets from a stellar mass black hole can set stringent constraints on the coupling parameters of quadratic gravity.

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DOI: 10.3847/1538-4357/aa72e2

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