Scalar quantum field theory with a complex cubic interaction.
In this Letter it is shown that an i phi(3) quantum field theory is a physically acceptable model because the spectrum is positive and the theory is unitary. The demonstration rests on the perturbative construction of a linear operator C, which is needed to define the Hilbert space inner product. The C operator is a new, time-independent observable in PT-symmetric quantum field theory.
Bender
Carl M
CM
Blackett Laboratory, Imperial College, London SW7 2BZ, UK.
Brody
Dorje C
DC
Jones
Hugh F
HF