Future very-large-area X-ray instruments (for which the effective area is larger than>3 m2) 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.

Geodesic Models of Quasi-periodic-oscillations as Probes of Quadratic Gravity / Maselli, Andrea; Pani, Paolo; Cotesta, Roberto; Gualtieri, Leonardo; Ferrari, Valeria; Stella, Luigi. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - STAMPA. - 843:1(2017), p. 25. [10.3847/1538-4357/aa72e2]

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

MASELLI, ANDREA;PANI, PAOLO;GUALTIERI, Leonardo;FERRARI, Valeria;
2017

Abstract

Future very-large-area X-ray instruments (for which the effective area is larger than>3 m2) 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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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/987275
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