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We introduce a family of static and spherically symmetric regular black-hole geometries characterized by a discrete core index $n$, a regularization scale $a$, and a dimensionless deformation parameter $\eta$. The construction starts from a positive, normalized effective density profile with a tunable central behavior....
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Curvature–Matter Feedback in Semiclassical Cosmology: A Reduced Mathematical Framework for Geometry-Induced Quantum Matter Production
Quantum fields on a time-dependent geometry can undergo particle production, but this does not establish a self-amplifying response of the geometry. We study a conditional two-amplitude closure for a signed curvature perturbation and a signed renormalized stress response. The physical assumptions are specified through...
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This thesis investigates the perturbative dynamics and phenomenology of compact objects in two approaches to quantum gravity: quadratic gravity and asymptotic safety. Linear perturbations provide a tool to probe the physical properties of spacetimes and their potential observational signatures, including quasinormal mo...
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Finite-range hair from a nonlocal matter sector: charged Yukawa black holes
{ We construct a new exact charged, static and spherically symmetric black-hole solution of the Einstein--Maxwell equations with an additional anisotropic matter sector, whose metric is the Reissner--Nordstr\"om geometry endowed with a Yukawa-type contribution. The Yukawa term is exponentially screened: it is visible i...
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The price of regularity: core gradient instability in nonsingular dyonic black holes
Spacetime singularities displayed by classical black hole solutions are expected to be cured by high-energy effects, beyond the regime of validity of General Relativity. On the other hand, there are well-known examples of classical theories allowing for nonsingular black hole solutions. The most prominent is obtained b...
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