Abstract
We make use of Chern-Simons cohomology and the family index theorem to deal with two-dimensional anomalies, infinite-dimensional algebras and their relations. We also take advantage of Zweibein formulation to treat the world sheet trace anomaly and Virasoro algebra in Polyakov string and to show how the anaomaly-free condition gives rise to the critical dimensions.
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Guo, HY., Ren, HC. & Wu, K. Conformal anomaly, virasoro algebra and Chern—Simons cohomology. Lett Math Phys 12, 181–188 (1986). https://doi.org/10.1007/BF00416507
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DOI: https://doi.org/10.1007/BF00416507