Exact WKB analysis reveals a bow-shaped Stokes geometry in the complex plane for JMN naked singularities, originating from the central logarithmic branch point and absent in black hole spacetimes.
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An RG-improved Schwarzschild metric with de Sitter core is studied for shadow radius, scalar/EM/Dirac quasinormal modes via WKB and time-domain methods, SCC compliance at the inner horizon, and a Davies-type thermodynamic phase transition.
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Quasinormal modes of the generalized JMN naked singularity using exact WKB analysis
Exact WKB analysis reveals a bow-shaped Stokes geometry in the complex plane for JMN naked singularities, originating from the central logarithmic branch point and absent in black hole spacetimes.
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Renormalization-group improved Schwarzschild black hole: shadow, ringdown, and strong cosmic censorship
An RG-improved Schwarzschild metric with de Sitter core is studied for shadow radius, scalar/EM/Dirac quasinormal modes via WKB and time-domain methods, SCC compliance at the inner horizon, and a Davies-type thermodynamic phase transition.