Entropy corrections to black holes produce modified metrics whose photon-sphere and shadow sizes can be constrained by Sgr A* observations.
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Topological classification via winding numbers of a vector field from generalized off-shell free energy shows regular Bardeen black holes have two opposite defects and zero total charge while Schwarzschild has one unstable branch.
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.
citing papers explorer
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Photon Spheres and shadow of modified black-hole entropies
Entropy corrections to black holes produce modified metrics whose photon-sphere and shadow sizes can be constrained by Sgr A* observations.
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Topological Thermodynamics of Generalized Bardeen Black Hole
Topological classification via winding numbers of a vector field from generalized off-shell free energy shows regular Bardeen black holes have two opposite defects and zero total charge while Schwarzschild has one unstable branch.
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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.
- Dymnikova Black Holes in Unimodular Gravity: Maxwell Sources and Vacuum Contributions