73 citations · 820 across the 37 of their papers we have counts for
20 papers · 1 filter
Dynamics of nucleation in thermal phase transitions
Oliver Gould, Joonas Hirvonen, Andrey Shkerin +1
We study dynamical effects during nucleation in thermal first-order phase transitions in field theory. Focusing on the classical regime of the decay of a metastable state, we prese…
False vacuum decay catalyzed by black hole in a heat bath
Bowen Hu, Kohei Kamada, Andrey Shkerin
We study false vacuum decay catalyzed by black holes. We consider a scalar field model with unstable potential in the background of a dilaton black hole in two dimensions. The mode…
Thermal false vacuum decay in (1+1)-dimensions: Evidence for non-equilibrium dynamics
Dalila Pîrvu, Andrey Shkerin, Sergey Sibiryakov
We numerically study the evolution of a classical real scalar field in dimensions with initial conditions describing thermal fluctuations around a metastable vacuum. We t…
Thermal False Vacuum Decay Is More Than It Seems
Dalila Pîrvu, Andrey Shkerin, Sergey Sibiryakov
We study the decay of a thermally excited metastable vacuum in classical field theory using real-time numerical simulations. We find a significantly lower decay rate than predicted…
Nontopological Electromagnetic Hedgehogs
Yulia Galushkina, Emin Nugaev, Andrey Shkerin
We study classical localised configurations - solitons - in a theory of self-interacting complex Proca field with the global symmetry. We focus on spherically-symmetric soli…
Out of this world neutrino oscillations
Tony Gherghetta, Andrey Shkerin
We study how vacuum neutrino oscillations can be affected by a causal, nonlinear and state-dependent modification of quantum field theory that may be interpreted using the many-wor…
Black hole induced false vacuum decay: The role of greybody factors
Andrey Shkerin, Sergey Sibiryakov
We study false vacuum decay catalyzed by black holes. We consider a toy two-dimensional model of a scalar field with an unstable potential in the background of a dilaton black hole…
Scale and Weyl Invariance in Einstein-Cartan Gravity
Georgios K. Karananas, Mikhail Shaposhnikov, Andrey Shkerin +1
We show how Einstein-Cartan gravity can accommodate both global scale and local scale (Weyl) invariance. To this end, we construct a wide class of models with nonpropagaing torsion…
Matter matters in Einstein-Cartan gravity
Georgios K. Karananas, Mikhail Shaposhnikov, Andrey Shkerin +1
We study scalar, fermionic and gauge fields coupled nonminimally to gravity in the Einstein-Cartan formulation. We construct a wide class of models with nondynamical torsion whose…
Black hole induced false vacuum decay from first principles
Andrey Shkerin, Sergey Sibiryakov
We provide a method to calculate the rate of false vacuum decay induced by a black hole. The method uses complex tunneling solutions and consistently takes into account the structu…
Einstein-Cartan gravity, matter, and scale-invariant generalization
Mikhail Shaposhnikov, Andrey Shkerin, Inar Timiryasov +1
We study gravity coupled to scalar and fermion fields in the Einstein-Cartan framework. We discuss the most general form of the action that contains terms of mass dimension not big…
Standard Model Meets Gravity: Electroweak Symmetry Breaking and Inflation
Mikhail Shaposhnikov, Andrey Shkerin, Sebastian Zell
We propose a model for combining the Standard Model (SM) with gravity. It relies on a non-minimal coupling of the Higgs field to the Ricci scalar and on the Palatini formulation of…
Review of non-topological solitons in theories with -symmetry
Emin Nugaev, Andrey Shkerin
We provide a review of non-topological solitonic solutions arising in theories with a complex scalar field and global or gauge -symmetry. It covers Q-balls, homogeneous charg…
Dilaton-assisted generation of the Fermi scale from the Planck scale
Andrey Shkerin
In scale-invariant theories of gravity the Planck mass , which appears due to spontaneous symmetry breaking, can be the only scale at the classical level. It was argued that t…
Vibrational modes of Q-balls
A. Kovtun, E. Nugaev, A. Shkerin
We study linear perturbations of classically stable Q-balls in theories admitting analytic solutions. Although the corresponding boundary value problem is non-Hermitian, the analys…
Gravity, Scale Invariance and the Hierarchy Problem
Mikhail Shaposhnikov, Andrey Shkerin
Combining the quantum scale invariance with the absence of new degrees of freedom above the electroweak scale leads to stability of the latter against perturbative quantum correcti…
Solving puzzles of spontaneously broken spacetime symmetries
Ivan Kharuk, Andrey Shkerin
We establish a classical analog of the Nambu-Goldstone theorem for spontaneous breaking of spacetime symmetries. It provides a counting rule for independent Nambu-Goldstone fields…
Conformal symmetry: towards the link between the Fermi and the Planck scales
Mikhail Shaposhnikov, Andrey Shkerin
If the mass of the Higgs boson is put to zero, the classical Lagrangian of the Standard Model (SM) becomes conformally invariant (CI). Taking into account quantum non-perturbative…
Q-holes
E. Nugaev, A. Shkerin, M. Smolyakov
We consider localized soliton-like solutions in the presence of a stable scalar condensate background. By the analogy with classical mechanics, it can be shown that there may exist…
Investigation of Q-tubes stability using the piecewise parabolic potential
E. Nugaev, A. Shkerin
We analyze the classical stability of Q-tubes --- charged extended objects in -dimensional complex scalar field theory. Explicit solutions were found analytically in the pie…