2.00 p.m.
Quantum backreaction in string theory
Oleg Evnin
Chulalongkorn University, Bangkok.
08-03-13

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Abstract

There are situations in string theory when a finite number of string quanta induce a significant backreaction upon the background and render the perturbation theory infrared-divergent. The simplest example is D0-brane recoil under an impact by closed strings. A more physically interesting case is backreaction on the evolution of a totally compact universe due to closed string gas. Such situations necessitate qualitative amendments to the traditional formulation of string theory in a fixed classical background. I shall review solved problems and current investigations in relation to this kind of quantum backreaction effects.