Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-09-18
Physics
High Energy Physics
High Energy Physics - Theory
29 pages, LaTeX, to appear in the Proceedings of the 1995 les Houches Summer School
Scientific paper
In this paper, based on the author's lectures at the 1995 les Houches Summer school, explicit expressions for the Friedan--Shenker connection on the vector bundle of WZW conformal blocks on the moduli space of curves with tangent vectors at $n$ marked points are given. The covariant derivatives are expressed in terms of ``dynamical $r$-matrices'', a notion borrowed from integrable systems. The case of marked points moving on a fixed Riemann surface is studied more closely. We prove a universal form of the (projective) flatness of the connection: the covariant derivatives commute as differential operators with coefficients in the universal enveloping algebra -- not just when acting on conformal blocks.
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