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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 PaniCENTRA, Departamento de Física, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais 1, 1049 Lisboa, PortugalR. CotestaMax Planck Institute for Gravitational Physics (Albert Einstein Institute), Am Mhlenberg 1, Potsdam, D-14476, GermanyLeonardo GualtieriDipartimento di Fisica, "Sapienza" Università di Roma, 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

ABI

Annotatsiya

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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