###### “Fundamental Constraints for Fundamental Theories”

As our understanding of the universe and its fundamental building blocks extends to shorter and shorter distances, experiments capable of probing these scales are becoming increasingly difficult to construct. Fundamental particle physics faces a potential crisis: an absence of data at the shortest possible scales. Yet remarkably, even in the absence of experimental data, the requirement of theoretical consistency puts stringent constraints on viable models of fundamental particles and their interactions. In this talk I’ll discuss a variety of criteria that have the possibility to address questions such as: What low energy theories admit consistent UV completions? Which massive particles are allowed in an interacting theory? Is string theory the unique UV completion of General Relativity?

**About the speaker**

Rachel Rosen's research focuses on quantum field theory and its applications to particle physics, gravitational physics and condensed matter systems. She is particularly interested in improving our understanding of gravity using the methodology of particle physics and, more generally, in theoretical consistency conditions for quantum field theories in flat spacetime and in de Sitter. Her previous work has included the application of effective field theory techniques to various states of matter, from ordinary fluids to new quantum liquids that could exist in the cores of very dense stars.