Constraints on the Sen black hole mass and charge from quasi-periodic oscillations
Boshkayev K. Muccino M.
December 2025Springer Nature
European Physical Journal C
2025#85Issue 12
We analyze quasi-periodic oscillation data from selected X-ray binary systems hosting black holes. To model the spacetime geometry, we resort to the static Sen solution—originally derived in the framework of heterotic string theory—which reduces to the Schwarzschild spacetime for vanishing electric charge. By fitting the observed frequencies within the relativistic precession model, we constrain the mass and charge parameters of the Sen black hole and discuss their astrophysical implications, particularly in distinguishing classical black holes from their string-inspired counterparts.
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Al-Farabi Kazakh National University, Al-Farabi av. 71, Almaty, 050040, Kazakhstan
Università di Camerino, Via Madonna delle Carceri 9, Camerino, 62032, Italy
ICRANet, Piazza della Repubblica 10, Pescara, 65122, Italy
Al-Farabi Kazakh National University
Università di Camerino
ICRANet
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