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Twenty Years of the Weyl Anomaly

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arxiv hep-th/9308075 v1 pith:7HBJQX52 submitted 1993-08-16 hep-th gr-qc

Twenty Years of the Weyl Anomaly

classification hep-th gr-qc
keywords weyltheoryanomaliesanomalyapplicationsauthorblackcapper
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In 1973 two Salam prot\'{e}g\'{e}s (Derek Capper and the author) discovered that the conformal invariance under Weyl rescalings of the metric tensor $g_{\mu\nu}(x)\rightarrow\Omega^2(x)g_{\mu\nu}(x)$ displayed by classical massless field systems in interaction with gravity no longer survives in the quantum theory. Since then these Weyl anomalies have found a variety of applications in black hole physics, cosmology, string theory and statistical mechanics. We give a nostalgic review. (Talk given at the {\it Salamfest}, ICTP, Trieste, March 1993.)

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