The S-matrix reloaded

<!--HTML--><p>I will briefly recount the recent revival of the non-perturbative S-matrix Bootstrap.</p> <p>Then I will explain how this (numerical) approach can be used to bound the space of Wilson coefficients in Effective Field&nbsp;Theories&nbsp;(EFT). I will focus on the application to supergravity in 10 spacetime&nbsp;dimensions (<a href="https://arxiv.org/abs/2102.02847" target="_blank">https://arxiv.org/abs/2102.02847</a>). Remarkably, strongly coupled&nbsp;string&nbsp;theory&nbsp;seems to saturate the bounds imposed by Lorentz invariance, unitarity and causality.</p> <p>At the end, we will discuss some of the many open questions in the field.</p> TH colloquia: https://cern.zoom.us/j/67346292748?pwd=ZnRkQWh0ZXVFQTc5K256QW5NcEcrdz09