Superstring Gravitational Wave Backgrounds with Spacetime Supersymmetry

Abstract

We analyse the stringy gravitational wave background based on the current algebra $E_2^c$. 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).

14 pages, CERN-TH.7218/94, HUN-IEP-94/5, LPTENS-94/10 (references updated)

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