Singular Contractions of W-algebras

Abstract

Many $W$-algebras (e.g. the $W_N$ algebras) are consistent for all values of the central charge except for a discrete set of exceptional values. We show that such algebras can be contracted to new consistent degenerate algebras at these exceptional values of the central charge.

10 pages, phyzzx.tex, QMW-92-7.(minor spelling and acknowledgement corrections)

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