"The conditions for spacetime supersymmetry of the heterotic in backgrounds with arbitrary metric, torsion, Yang-Mills and dilaton expectation values are determined using the sigma model approach. The resulting equations are explicitly solved for the torsion and dilaton fields, and the remaining equations cast in a simple form. Previously unnoticed topological obstructions to solving these equations are found. The equations are shown to agree to leading order in perturbation theory with those derived in a field theory approach, provided one considers a more general ansatz than in previous analyses by allowing for a warp factor for the metric. Exact solutions with non-zero torsion are found, indicating a new class of finite sigma models."
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Academics from the United StatesHarvard University alumniPhysicists from the United StatesMassachusetts Institute of Technology alumniUniversity of California, Berkeley alumni
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Andrew Strominger
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