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Quantum improved charged black holes
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We consider quantum effects of gravitational and electromagnetic fields in spherically symmetric black hole spacetimes in the asymptotic safety scenario. Introducing both the running gravitational and electromagnetic couplings from the renormalization group equations and applying a physically sensible scale identification scheme based on the Kretschmann scalar, we construct a quantum mechanically corrected, or quantum improved Reissner-Nordstrom metric. We study the global structure of the quantum improved geometry and show, in particular, that the central singularity is resolved, being generally replaced with a regular Minkowski-core, where the curvature tensor vanishes. Exploring cases with more general scale identifications, we further find that the space of quantum improved geometries is divided into two regions: one for geometries with a regular Minkowski-core and the other for those with a weak singularity at the center. At the boundary of the two regions, the geometry has either Minkowski-, de Sitter-, or anti-de Sitter(AdS)-core.
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Cited by 3 Pith papers
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Effective Metric Description of Charged Black Holes
Near-extremal and extremal charged black holes can be described by an effective metric built from the proper time of an infalling observer, with explicit consistency constraints on the deformation parameters.
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Quasinormal spectra of higher dimensional regular black holes in theories with infinite curvature corrections
For six families of higher-dimensional regular black holes, positive higher-curvature coupling reduces quasinormal-mode oscillation frequencies and damping rates, a trend verified at low and eikonal multipoles.
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Quantum-Corrected Thermodynamics, Dirac Perturbations, Geodesic Structure, and Topological Phases of Black Holes with Non-Minimal Logarithmic Coupling
For the ln(R)F² black hole, a single coupling B is claimed to shrink the shadow and ISCO, alter Dirac quasinormal ringing, suppress Hawking luminosity, and set the sign of an effective pressure on the topological defect line.
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