Discovery-HET Seminar: Rutger Boels – University of Copenhagen

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Discovery-HET Seminar: Rutger Boels

Speaker: Rutger Boels (University of Hamburg)

Title: Constructing the string S-matrix in target space


String theory is a theory of strings amongst many other things. The usual way of describing string theory is therefore through its world-sheet. This however always involves an enormous amount of, in principle, redundant information. A simple question is: can string theory be defined without this redundancy? Based on joint, very-soon-to-appear work with Tobias Hansen I'll show a working definition of tree level string theory in a flat target space. We have a small-ish set of conditions in target space whose unique solution is argued to be the usual string S-matrix. Interestingly, the notions of critical dimension and intercept are shown to arise naturally by requiring locality and unitarity. I'll end with more questions than answers, but at least the questions are interesting and well-posed. In particular there seem to be no fundamental restrictions to generalize to curved spaces.