6 papers
Degenerate vortices and world-line instantons in three-dimensional gauge theories
Evgenii Ievlev, Mikhail Shifman
In this paper we continue the study of particle-like topological solitons with degenerate masses and their mixing due to world-line instantons. Previously, this phenomenon was stud…
Degenerate kinks and kink-instantons in two-dimensional scalar field models with and supersymmetry
Evgenii Ievlev, Mikhail Shifman
Models with classically degenerate vacua often support quasiclassical configurations of nontrivial topology. In (0+1)-dimensional quantum mechanics with a double-well potential, fo…
Degenerate Domain Walls in Supersymmetric Theories
Shi Chen, Evgenii Ievlev, Mikhail Shifman
In supersymmetric Yang-Mills theories (SYM) tension-degenerate domain walls are typical. Adding matter fields in fundamental representation we arrive at supersymmetric QCD (SQCD) s…
QCD Chemistry: Remarks on Diquarks
M. Shifman
In connection with recent discoveries of heavy-quark containing exotic states publications discussing diquarks ( stand for a heavy and light quarks, respectively) prolife…
Two types of domain walls in super-QCD: how they are classified and counted
Shi Chen, Evgenii Ievlev, Mikhail Shifman
We study multiplicities and junctions of BPS domain walls interpolating between different chiral vacua in supersymmetric QCD (SQCD) with the SU gauge group and…
New Soft Theorems for Two-Scalar Sigma Models
Karol Kampf, Jiri Novotny, Mikhail Shifman +1
In this paper, we study the scattering amplitudes and soft theorems for the sigma models with two scalars. We show that if the particles are Goldstone bosons, then you necessarily…