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$G/G$--Topological Field Theories by Cosetting $G_k$

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arxiv hep-th/9201036 v1 pith:ZUYXZI7L submitted 1992-01-19 hep-th

classification hep-th
keywords theoriesbrstcohomologycomplexfieldmodelstopologicalalgebra
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abstract

$G/G$ topological field theories based on $G_k$ WZW models are constructed and studied. These coset models are formulated as Complex BRST cohomology in $G^c_k$, the complexified level $k$ current algebra. The finite physical spectrum corresponds to the conformal blocks of $G_k$ .The amplitudes for $G/G$ theories are argued to be given in terms of the $G_k$ fusion rules. The $G_k/G_k$ character is the Kac-Weyl numerator of $G_k$ and is interpreted as an index. The Complex BRST cohomology is found to contain states of arbitrary ghost number. Intriguing similarities of $G/G$ to $c\leq 1$ matter systems coupled to two dimensional gravity are pointed out.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Non-Invertible Anyon Condensation and Level-Rank Dualities

    hep-th 2023-12 unverdicted novelty 8.0 of 10

    New dualities in 3d TQFTs are derived via non-invertible anyon condensation, generalizing level-rank dualities and providing new presentations for parafermion theories, c=1 orbifolds, and SU(2)_N.

  2. A Comment On Topological Degeneracy In Gauged WZW Models

    hep-th 2026-08 conditional novelty 7.0 of 10

    The gauged WZW model is the GKO coset model coupled to a 2d topological field theory whose commutative Frobenius algebra End(B) controls an extra finite degeneracy.

  3. Kac-Moody algebras from M5-giants

    hep-th 2025-08 conditional novelty 6.0 of 10

    The single-sum giant graviton expansion of ADHM Higgs indices is proposed to encode, in two fugacity limits, the vacuum characters of the affine Kac-Moody algebras \ hat su(l)_1^{\ times m} and \ hat su(l)_m.

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