High Energy Theory Seminar

Saddle point approximation is a useful method to explore high energy asymptotic behaviors of string scattering amplitudes. We show that, even at tree-level, there are infinitely many complex saddles contributing to string scattering amplitudes, and that the complex saddles detect their appropriate poles and zeros. We also show that complex saddles detect oscillatory behaviors of a stringy toy model, that is, a class of ordinary higher-loop Feynman diagrams but with the stringy mass tower. Finally, we propose that complex saddle analysis can be applied to finding chaos in string scatterings and measuring their Lyapunov exponents.

The talk is in 469 Lauritsen.

Contact [email protected] for Zoom information.