Mass for Plasma Photons from Gauge Symmetry Breaking (2009)
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BibTeX
@MISC{Mendonça09massfor,
author = {J. T. Mendonça and P. Castelo Ferreira},
title = {Mass for Plasma Photons from Gauge Symmetry Breaking},
year = {2009}
}
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Abstract
We derive the effective masses for photons in unmagnetized plasma waves using a quantum field theory with two vector fields (gauge fields). In order to properly define the quantum field degrees of freedom we re-derive the classical wave equations on light-front gauge. This is needed because the usual scalar potential of electromagnetism is, in quantum field theory, not a physical degree of freedom that renders negative energy eigenstates. We also consider a background local fluid metric that allows for a covariant treatment of the problem. The different masses for the longitudinal (plasmon) and transverse photons are in our framework due to the local fluid metric. We apply the mechanism of mass generation by gauge symmetry breaking recently proposed by the authors by giving a non-trivial vacuum-expectation-value to the second vector field (gauge field). The Debye length λD is interpreted as an effective compactification length and we compute an explicit solution for the large gauge transformations that correspond to the specific mass eigenvalues derived here. Using an usual quantum field theory canonical quantization we obtain the usual results in the literature. Although none of these ingredients are new to physicist, as far as the authors are aware it is the first time that such constructions are applied to Plasma Physics. Also we give a physical interpretation (and realization) for the second vector field in terms of the plasma background in terms of known physical phenomena. Addendum: It is given a short proof that equation (10) is wrong, therefore equations (12-17) are meaningless. The remaining results are correct being generic derivations for nonmagnetized plasmas derived in a covariant QFT framework. PACS: 03.50.De, 03.70.+k, 11.15.-q
Keyphrases
plasma photon gauge symmetry breaking quantum field theory second vector field gauge field background local fluid vector field different mass nonmagnetized plasma render negative energy eigenstates unmagnetized plasma wave gauge symmetry physical phenomenon covariant qft framework classical wave equation transverse photon effective compactification length specific mass eigenvalue debye length plasma background first time physical degree covariant treatment effective mass generic derivation quantum field degree local fluid large gauge transformation non-trivial vacuum-expectation-value physical interpretation therefore equation usual scalar potential explicit solution short proof mass generation plasma physic light-front gauge usual result
