$\mathcal{P}\mathcal{T}$-symmetric quantum field theory on the noncommutative spacetime

Abstract

We consider the $\mathcal{P}\mathcal{T}$-symmetric quantum field theory on the noncommutative spacetime with angular twist and construct its pseudo-Hermitian interpretation. We explore the differences between internal and spatial parities in the context of the angular twist and for the latter we find new $\mathcal{P}\mathcal{T}$-symmetric interactions that are nontrivial only for the noncommutative spacetime. We reproduce the same formula for the leading order $T$-matrix of the equivalent Hermitian model as the one obtained earlier for the quantum field theory on the commutative spacetime. This formula implies that the leading order scattering amplitude preserves the symmetries of the noncommutative geometry if they are not broken in the non-Hermitian formulation.

arXiv comment13 pages, no figures; References accidentally lost in the first version restored, some comments on the choice of NCG is given, few misprints corrected

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