Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-02-07
Annals Phys. 243 (1995) 76-89
Physics
High Energy Physics
High Energy Physics - Theory
17 pages, Latex, no figures. Corrections on the nomenclature of affine Lie algebra have been made; we thank Professor Marty Ha
Scientific paper
10.1006/aphy.1995.1091
The study of hidden symmetries within Dirac's formalism does not possess a systematic procedure due to the lack of first-class constraints to act as symmetry generators. On the other hand, in the Faddeev-Jackiw approach, gauge and reparametrization symmetries are generated by the null eigenvectors of the sympletic matrix and not by constraints, suggesting the possibility of dealing systematically with hidden symmetries throughout this formalism. It is shown in this paper that indeed hidden symmetries of noninvariant or gauge fixed systems are equally well described by null eigenvectors of the sympletic matrix, just as the explicit invariances. The Faddeev-Jackiw approach therefore provides a systematic algorithm for treating all sorts of symmetries in an unified way. This technique is illustrated here by the SL(2,R) affine Lie algebra of the 2-D induced gravity proposed by Polyakov, which is a hidden symmetry in the canonical approach of constrained systems via Dirac's method, after conformal and reparametrization invariances have been fixed.
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