21 citations · 54 across the 5 of their papers we have counts for
5 papers
Analytical computation of quantum corrections to non-topological soliton (bright soliton) within the saddle-point approximation
Andrei Kovtun
Schrödinger field theory with an attractive self-interaction possess non-topological extended solutions with a finite energy in both finite and infinite-volume cases, namely, brigh…
Breaking BEC: Quantum evolution of unstable condensates
A. Kovtun, M. Zantedeschi
In this work we numerically explore the quantum behavior of a classically unstable relativistic Bose-Einstein condensate (BEC). The main goal is to study the phenomenon of so-calle…
Breaking BEC
A. Kovtun, M. Zantedeschi
In this work quantum corrections to the classical evolution of a relativistic scalar condensate are studied. The problem is approached by means of two different perturbative approa…
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…
Radiative corrections and instability of large Q-Balls
A. V. Kovtun, E. Ya. Nugaev
We discuss stability of Q-balls interacting with fermions in theory with small coupling constant g. We argue that for configurations with large global U(1)-charge Q the problem of…