Multiple black-hole and naked-singularity spacetimes are tested against S2 star astrometric and spectroscopic data, showing statistical degeneracy among several models under current observations.
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The authors calculate horizons, Hawking temperature, heat capacity, effective potentials, epicyclic frequencies, and shadows for a GR+NED+PFDM black hole, then constrain mass, magnetic charge, PFDM parameter, and orbital radius via MCMC on QPO observations from XTE J1550-564 and similar sources.
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Testing the Spacetime Geometry of Sgr A* with the Relativistic Orbit of S2 star
Multiple black-hole and naked-singularity spacetimes are tested against S2 star astrometric and spectroscopic data, showing statistical degeneracy among several models under current observations.
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Black holes in general relativity coupled with NEDs surrounded by PFDM: thermodynamics, epicyclic oscillations, QPOs, and shadow
The authors calculate horizons, Hawking temperature, heat capacity, effective potentials, epicyclic frequencies, and shadows for a GR+NED+PFDM black hole, then constrain mass, magnetic charge, PFDM parameter, and orbital radius via MCMC on QPO observations from XTE J1550-564 and similar sources.