On the algebraic structure of gravitational descendants in CP(n − 1) coset models

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• 作者：Lerche ; W. ; Warner ; N.P.
• 刊名：Physics Letters B
• 出版年：1995
• 期刊代码：58_03702693
• 类别：ph
• 出版时间：January 19, 1995
• 卷：343
• 期：1-4
• 页码：87-93
• 文件大小：418 K

摘要

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 W_n-gravitational ground ring spectra of these theories in terms of affine-SU (n) highest weights.