Publications (8)
Solar mass black holes from neutron stars and bosonic dark matter
Raghuveer Garani, Dmitry Levkov, Peter Tinyakov
Black holes with masses cannot be produced via stellar evolution. A popular scenario of their formation involves transmutation of neutron stars - by accumul…
Semiclassical S-matrix for black holes
Fedor Bezrukov, Dmitry Levkov, Sergey Sibiryakov
We propose a semiclassical method to calculate S-matrix elements for two-stage gravitational transitions involving matter collapse into a black hole and evaporation of the latter.…
Semiclassical S-matrix and black hole entropy in dilaton gravity
Maxim Fitkevich, Dmitry Levkov, Sergey Sibiryakov
We use complex semiclassical method to compute scattering amplitudes of a point particle in dilaton gravity with a boundary. This model has nonzero minimal black hole mass …
Fatal youth of the Universe: black hole threat for the electroweak vacuum during preheating
Dmitry Gorbunov, Dmitry Levkov, Alexander Panin
Small evaporating black holes were proposed to be dangerous inducing fast decay of the electroweak false vacuum. We observe that the flat-spectrum matter perturbations growing at t…
Exact solutions and critical chaos in dilaton gravity with a boundary
Maxim Fitkevich, Dmitry Levkov, Yegor Zenkevich
We consider (1+1)-dimensional dilaton gravity with a reflecting dynamical boundary. The boundary cuts off the region of strong coupling and makes our model causally similar to the…
Dilaton gravity with a boundary: from unitarity to black hole evaporation
Maxim Fitkevich, Dmitry Levkov, Yegor Zenkevich
We point out that two-dimensional Russo-Susskind-Thorlacius (RST) model for evaporating black holes is locally equivalent - at the full quantum level - to flat-space Jackiw-Teitelb…
The fate of small classically stable Q-balls
Dmitry Levkov, Emin Nugaev, Andrei Popescu
The smallest classically stable Q-balls are, in fact, generically metastable: in quantum theory they decay into free particles via collective tunneling. We derive general semiclass…
High-energy limit of collision-induced false vacuum decay
Sergei Demidov, Dmitry Levkov
We develop a consistent semiclassical description of field-theoretic collision-induced tunneling at arbitrary high collision energies. As a playground we consider a (1+1)-dimension…