A family of Weyl λ-BMS algebras is realized canonically from a Klein-Gordon field, centrally extended, and shown to have BRST cohomology matching an N=2 superconformal chiral ring, while the conformal BMS W-algebra is shown to admit no BRST complex.
Untwisting Topological Field Theories
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A method is presented by which a hidden N=2 superconformal symmetry can be exhibited in a string theory or indeed in a topological conformal field theory. More precisely, we present strong evidence, based on calculations with string theories, in favour of the conjecture that any topological conformal field theory can be obtained by twisting an N=2 superconformal field theory. (Talk given at the Workshop on Gauge Theories, Applied Supersymmetry and Quantum Gravity held at Imperial College, London, 5-10 July 1996.)
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BMS-like algebras: canonical realisations and BRST quantisation
A family of Weyl λ-BMS algebras is realized canonically from a Klein-Gordon field, centrally extended, and shown to have BRST cohomology matching an N=2 superconformal chiral ring, while the conformal BMS W-algebra is shown to admit no BRST complex.