Nonlocal gravity shrinks the ISCO radius, boosts QPO frequencies, and constrains α/M ≤ 0.452 with M ≲ 43.6 M_⊙ for observed high-frequency QPOs under resonance models.
Evidence for a 2:3 resonance in Sco X-1 kHz QPOs
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abstract
We find evidence that the two high frequency QPOs in Sco X-1 are, more often than not, approximately in the 2:3 frequency ratio familiar from studies of black hole candidates (e.g., XTE J1550-564, Remillard et al. 2002). This implies that the double kHz QPO phenomenon in neutron stars has its origin in properties of strong-field gravity and has little to do with the rotation of a stellar surface or any magnetic field structure anchored in the star.
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Epicyclic frequencies, periapsis shift, and gravitational Larmor precession are derived for charged particles in the weak-magnetic limit of a magnetized Kiselev black hole.
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The properties and predictions of quasi-periodic oscillations around a black hole in nonlocal gravity
Nonlocal gravity shrinks the ISCO radius, boosts QPO frequencies, and constrains α/M ≤ 0.452 with M ≲ 43.6 M_⊙ for observed high-frequency QPOs under resonance models.
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Epicyclic motion of charged particles around a weakly magnetized Kiselev black hole
Epicyclic frequencies, periapsis shift, and gravitational Larmor precession are derived for charged particles in the weak-magnetic limit of a magnetized Kiselev black hole.