Complex BPS solitons with real energies from duality

Abstract

Following a generic approach that leads to Bogomolny-Prasad-Sommerfield (BPS) soliton solutions by imposing self-duality, we investigate three different types of non-Hermitian field theories. We consider a complex version of a logarithmic potential that possess BPS super-exponential kink and antikink solutions and two different types of complex generalisations of systems of coupled sine-Gordon models with kink and antikink solution of complex versions of arctan type. Despite the fact that all soliton solutions obtainedin this manner are complex in the non-Hermitian theories we show that they possess real energies. For the complex extended sine-Gordon model we establish explicitly that the energies are the same as those in an equivalent pair of a non-Hermitian and Hermitian theory obtained from a pseudo-Hermitian approach by means of a Dyson map. We argue that the reality of the energy is due to the topological properties of the complex BPS solutions. These properties result in general from modified versions of antilinear CPT symmetries that relate self-dual and an anti-self-dual theories.

arXiv comment15 pages, 5 figures

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• Non-Hermitian gauge field theories and BPS limits
• Poincaré symmetries and representations in pseudo-Hermitian quantum field theory
• Higher time-derivative theories from space-time interchanged integrable field theories
• Non-Hermitian Yukawa interactions of fermions with axions: potential microscopic origin and dynamical mass generation
• Complex BPS Skyrmions with real energy
• Stability in integrable nonlocal nonlinear equations
• Linearly stable and unstable complex soliton solutions with real energies in the Bullough-Dodd model
• Moduli spaces for PT-regularized solitons