On the Algebraic Structure of Gravitational Descendants in CP(n-1) Coset Models
Abstract
We investigate how specific free-field realizations of twisted N=2 supersymmetric coset models give rise to natural extensions of the ``matter'' Hilbert spaces in such a manner as to incorporate the various gravitational excitations. In particular, we show that adopting a particular screening prescription is equivalent to imposing the requisite equivariance condition on cohomology. We find a simple algebraic characterization of the Wn-gravitational ground ring spectra of these theories in terms of affine-SU(n) highest weights..
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