Generalized Bardeen black holes show two topological defects of opposite winding numbers yielding zero total charge in their thermodynamic vector field, unlike Schwarzschild's single unstable branch, with regularization parameters shaping the phase structure.
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Entropy corrections to black holes produce modified metrics whose photon-sphere and shadow sizes can be constrained by Sgr A* observations.
Dymnikova black hole geometry is realized via Maxwell sources in unimodular gravity with radially dependent Lambda, producing a regular electric field from a localized charge distribution that has zero net asymptotic charge.
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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Topological Thermodynamics of Generalized Bardeen Black Hole
Generalized Bardeen black holes show two topological defects of opposite winding numbers yielding zero total charge in their thermodynamic vector field, unlike Schwarzschild's single unstable branch, with regularization parameters shaping the phase structure.
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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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Dymnikova Black Holes in Unimodular Gravity: Maxwell Sources and Vacuum Contributions
Dymnikova black hole geometry is realized via Maxwell sources in unimodular gravity with radially dependent Lambda, producing a regular electric field from a localized charge distribution that has zero net asymptotic charge.
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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.