New ansatz for metric operator calculation in pseudo-Hermitian field theory

In this work, a new ansatz is introduced to make the calculations of the metric operator in pseudo-Hermitian field theory simpler. The idea is to assume that the metric operator is not only a functional of the field operator φ and its conjugate field π but also on the field gradient ∇φ. The ansatz enables one to calculate the metric operator just once for all dimensions of the space-time. We calculated the metric operator of the iφ3 scalar field theory up to first order in the coupling. The higher orders can be conjectured from their corresponding operators in the quantum mechanical case available in the literature. We assert that the calculations existing in literature for the metric operator in field theory are cumbersome and are done case by case concerning the dimension of space-time in which the theory is investigated. In fact, with the aid of this work a rigorous study of a PT-symmetric Higgs mechanism can be reached.