4 results for "Skvortsova, Milena"
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Long-lived quasinormal frequencies for regular black hole supported by the Einasto profile in the presence of the magnetic field
We investigate quasinormal modes, grey-body factors, and absorption cross-sections of a massive scalar field in regular black-hole spacetimes supported by the Einasto density profile. The analysis is performed for $\tilde n=1/2$, $1$, and $5$, where the scalar mass $μ$ is treated as an effective…
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Massive scalar quasinormal modes of an asymptotically flat regular black hole supported by a phantom Dirac--Born--Infeld field
We study the quasinormal spectrum of a massive test scalar field in the exact asymptotically flat regular black-hole geometry supported by a phantom Dirac--Born--Infeld scalar. Using high-order WKB approximation improved by Padé resummation, together with characteristic time-domain integration and…
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Preprint Full text
5D black holes and mirror stars from nonlinear electrodynamics: Existence and stability
We consider static, spherically symmetric solutions of 5D general relativity with magnetic fields governed by nonlinear electrodynamics (NED) with the Lagrangian $L(F)$, $F = F_{AB} F^{AB}$, and show that generic solutions describe either 5D black holes (also called black strings due to a circular…
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Stability ranges of magnetic black holes and mirror (topological) stars in 5D gravity
We discuss static, spherically symmetric solutions to the 5D Einstein-Maxwell equations (belonging to wide classes of multidimensional solutions known at least from the 1990s) and select among them those which must observationally look like local objects whose surface reflects back particles or…