Notes on gauging noneffective group actions

Details Notes on gauging noneffective group actions Notes on gauging noneffective group actions

2005-02-02

arxiv.org/abs/hep-th/0502027v2

Physics

High Energy Physics

High Energy Physics - Theory

37 pages, LaTeX, 3 figures; v2: typos fixed

Scientific paper

In this paper we study sigma models in which a noneffective group action has been gauged. Such gauged sigma models turn out to be different from gauged sigma models in which an effectively-acting group is gauged, because of nonperturbative effects on the worldsheet. We concentrate on finite noneffectively-acting groups, though we also outline how analogous phenomena also happen in nonfinite noneffectively-acting groups. We find that understanding deformations along twisted sector moduli in these theories leads one to new presentations of CFT's, defined by fields valued in roots of unity.

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