SO(2,4)-covariant quantization of the Maxwell field in a conformally flat space
Abstract
We present an SO(2,4)-covariant quantization of the free electromagnetic field in conformally flat spaces (CFS). A CFS is realized in a six-dimensional space as an intersection of the null cone with a given surface. The smooth move of the latter is equivalent to perform a Weyl rescaling. This allows to transport the SO(2,4)-invariant quantum structure of the Maxwell field from Minkowski space to any CFS. Calculations are simplified and the CFS Wightman two-point functions are given in terms of their Minkowskian counterparts. The difficulty due to gauge freedom is surpassed by introducing two auxiliary fields and using the Gupta-Bleuler quantization scheme. The quantum structure is given by a vacuum state and creators/annihilators acting on some Hilbert space. In practice, only the Hilbert space changes under Weyl rescalings. Also the quantum SO(2,4)-invariant free Maxwell field does not distinguish between two CFSs.
Keywords
Cite
@article{arxiv.1205.3804,
title = {SO(2,4)-covariant quantization of the Maxwell field in a conformally flat space},
author = {Sofiane Faci},
journal= {arXiv preprint arXiv:1205.3804},
year = {2013}
}
Comments
7 pages, 1 figure, slight modifications, accepted for publication in PRD