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Physics Letters B
We analyse the stringy gravitational wave background based on the current algebra E c 2 . W e determine its exact spectrum and construct the modular invariant v acuum 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).doi:10.1016/0370-2693(94)91059-6 fatcat:5zyol3y5yzeenn4odnguhjxese