String interactions in gravitational wave backgrounds

Details String interactions in gravitational wave backgrounds String interactions in gravitational wave backgrounds

2003-05-09

arxiv.org/abs/hep-th/0305081v3

Nucl.Phys. B674 (2003) 80-170

Physics

High Energy Physics

High Energy Physics - Theory

99 pages, LateX (v2) The discussion of the flat space limit has been changed (v3) Final version that appeared in Nucl. Phys B

Scientific paper

10.1016/j.nuclphysb.2003.09.020

The non-compact CFT of a class of NS-supported pp-wave backgrounds is solved exactly. The associated tree-level covariant string scattering amplitudes are calculated. The S-matrix elements are well-defined, dual but not analytic as a function of $p^+$. They have poles corresponding to physical intermediate states with $p^+\not =0$ and logarithmic branch cuts due to on-shell exchange of spectral-flow images of $p^+=0$ states. When $\mu\to 0$ a smooth flat space limit is obtained. The $\mu\to\infty$ limit, unlike the case of RR-supported pp-waves, gives again a flat space theory.

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