KPZ Analysis for $W_3$ Gravity

Details KPZ Analysis for $W_3$ Gravity KPZ Analysis for $W_3$ Gravity

1992-11-24

arxiv.org/abs/hep-th/9211108v1

Nucl.Phys. B405 (1993) 669-694

Physics

High Energy Physics

High Energy Physics - Theory

26 pages, THU-92/34

Scientific paper

10.1016/0550-3213(93)90563-5

Starting from the covariant action for $W_3$ gravity, we discuss the BRST quantization of $W_3$ gravity. Taking the chiral gauge the BRST charge has a natural interpretation in terms of the quantum Drinfeld--Sokolov reduction for $Sl(3,\re)$. Nilpotency of this charge leads to the KPZ formula for $W_3$. In the conformal gauge, where the covariant action reduces to a Toda action, the BRST charge is equivalent to the one recently constructed by Bershadsky et al.

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