Mixing internal and spacetime transformations: some examples and counterexamples
High Energy Physics - Theory
2008-11-26 v1
Abstract
This note addresses the question whether in a gauge theory coupled to gravity internal and spacetime transformation can be mixed. It is shown that if the VEV of the gauge field is flat, the symmetry group is always a product of internal and spacetime symmetries. On the other hand, if the VEV of the gauge field is not flat it is impossible to properly define the notion of a ``spacetime'' transformation; as a consequence, if the symmetry group is nontrivial, mixing generically occurs.
Cite
@article{arxiv.0803.0303,
title = {Mixing internal and spacetime transformations: some examples and counterexamples},
author = {R. Percacci},
journal= {arXiv preprint arXiv:0803.0303},
year = {2008}
}
Comments
Plain TEX, 6 pages