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Gauge invariance and the Englert-Brout-Higgs mechanism in non-Hermitian field theories
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abstract
We discuss $\mathcal{PT}$-symmetric Abelian gauge field theories, as well as their extension to the Englert-Brout-Higgs mechanism for generating a mass for a vector boson. Gauge invariance is not straightforward, and we discuss the different related problems, as well as a solution which consists in coupling the gauge field to a current that is not conserved. Non-Hermiticity then necessarily precludes the Lorenz gauge condition but nevertheless allows for a consistent formulation of the theory. We therefore generalise the Englert-Brout-Higgs mechanism to $\mathcal{PT}$-symmetric field theories, opening the way to constructing non-Hermitian extensions of the Standard Model and new scenarios for particle model-building.
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Cited by 1 Pith paper
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Oscillators with imaginary coupling: spectral functions in quantum mechanics and quantum field theory
A pair of oscillators or scalar fields with imaginary coupling has real energy levels under a modified inner product, and non-positive spectral functions are linked to non-observable operators.
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