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Journal Article

Geodesic models of quasi-periodic-oscillations as probes of quadratic gravity


Cotesta,  Roberto
AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Maselli, A., Pani, P., Cotesta, R., Gualtieri, L., Ferrari, V., & Stella, L. (2017). Geodesic models of quasi-periodic-oscillations as probes of quadratic gravity. Astrophysical Journal, 843(1): 25. doi:10.3847/1538-4357/aa72e2.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-AC01-7
Future very-large-area X-ray instruments (for which the effective area is larger than $>3$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.