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Echoes in brane worlds: ringing at a black hole--wormhole transition
Kirill A. Bronnikov, Roman A. Konoplya
Echoes are known as modifications of the usual quasinormal ringing of a black hole at late times because of the deviation of space-time from the initial black-hole geometry in a sm…
Comment on "Linear superposition of regular black hole solutions of Einstein nonlinear electrodynamics"
K. A. Bronnikov
It is argued that in the paper by A.A. Garcia-Diaz and G. Gutierrez-Cano [Phys. Rev. D 100, 064068 (2019)] on nonlinear electrodynamics coupled to general relativity, along with so…
String clouds and radiation flows as sources of gravity in static or rotating cylinders
K. A. Bronnikov
Static and stationary cylindrically symmetric space-times in general relativity are considered, supported by distributions of cosmic strings stretched in the azimuthal (), longi…
A possible semiclassical bounce instead of a Schwarzschild singularity
K. A. Bronnikov, S. V. Bolokhov, M. V. Skvortsova
We have previously shown that the singularity in a Schwarzschild black hole of stellar or larger mass may be avoided in a semiclassical manner by using as a source of gravity the s…
Spinor fields in spherical symmetry. Einstein-Dirac and other space-times
K. A. Bronnikov, Yu. P. Rybakov, Bijan Saha
We discuss the static spherically symmetric Einstein-spinor field system in the possible presence of various spinor field nonlinearities. We take into account that the spinor field…
Spherically symmetric black holes and wormholes in hybrid metric-Palatini gravity
K. A. Bronnikov
The so-called hybrid metric-Palatini theory of gravity (HMPG), proposed in 2012 by T. Harko et al., is known to successfully describe both local (solar-system) and cosmological obs…