**Rachel Rosen**(Columbia University).

**2-4pm, Tuesday March 20, Columbia University Knox Hall C01**(606 W 122 St).

Abstract: as our understanding of the universe and its basic 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 present some of these constraints and discuss their applications for cosmology, string theory and more.

*There will be dinner after the **talk**. If you are interested, please send an email with “Dinner” in the heading to nyphilsci@gmail.com (please note that all are welcome, but only the speaker’s dinner will be covered). If you have any other questions, please email **isaac**.**wilhelm**@rutgers.edu.*