PT-Symmetric Quantum Field Theory

TL;DR

This paper discusses PT-symmetric quantum electrodynamics, clarifying that the C operator used for unitarity is not related to charge conjugation, challenging previous assumptions in the field.

Contribution

It provides a new interpretation of the C operator in PT-symmetric quantum field theory, distinguishing it from charge conjugation.

Findings

The C operator is not equivalent to charge conjugation in PT-symmetric QED.

Clarification of the role of the C operator in unitarity.

Implications for the understanding of symmetries in PT-symmetric quantum theories.

Abstract

In the context of the PT-symmetric version of quantum electrodynamics, it is argued that the C operator introduced in order to define a unitary inner product has nothing to do with charge conjugation.