Superstring Gravitational Wave Backgrounds with Spacetime Supersymmetry
Abstract
We analyse the stringy gravitational wave background based on the current algebra Ec2. We determine its exact spectrum and construct the modular invariant vacuum energy. The corresponding N=1 extension is also constructed. The algebra is again mapped to free bosons and fermions and we show that this background has N=4 (N=2) unbroken spacetime supersymmetry in the type II (heterotic case).
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