The paper derives spin precession frequencies for a rotating naked singularity spacetime, shows they match Kerr in the weak field, and uses quasi-periodic oscillations to constrain and disfavor the model.
Frequency Correlations of QPOs Based on a Disk Oscillation Model in Warped Disks
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abstract
In previous papers we proposed a model that high-frequency quasi-periodic oscillations (QPOs) observed in black-hole and neutron-star X-ray binaries are disk oscillations (inertial-acoustic and/or g-mode oscillations) resonantly excited on warped disks. In this paper we examine whether time variations of the QPOs and their frequency correlations observed in neutron-star X-ray binaries can be accounted for by this disk-oscillation model. By assuming that a warp has a time-dependent precession, we can well describe observed frequency correlations among kHz QPOs and LF QPOs in a wide range of frequencies.
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gr-qc 1years
2025 1verdicts
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Spin precession frequencies of a test gyroscope around a naked singularity and quasi-periodic oscillations
The paper derives spin precession frequencies for a rotating naked singularity spacetime, shows they match Kerr in the weak field, and uses quasi-periodic oscillations to constrain and disfavor the model.