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Seminar: ‘How string theory computes quantum gravity amplitudes’
March 9 | 15:00 - 16:00
Title: ‘How string theory computes quantum gravity amplitudes’
Speaker: Lorenz Eberhardt (U. Amsterdam)
Venue&Time: Red Room / 15:00
Abstract: String theory provides a framework in which quantum gravitational scattering amplitudes are ultraviolet finite and computable in perturbation theory. These amplitudes are defined by integrating over the moduli space of Riemann surfaces, replacing the Feynman diagram expansion of field theory by a sum over worldsheet topologies. I will review how this definition arises and explain structural properties such as UV-finiteness, dual resonance and their Regge behavior. I will then discuss recent progress in explicit computations, focusing on one-loop amplitudes and new results on their high-energy behavior.
