Physics Colloquium Series
Date: Thursday, October 10, 2019
Speaker: Timothy Cohen, University of Oregon, Physics dept.
Title: Describing Nature Effectively
Abstract: The aim of this colloquium will be to provide some insight into a modern point of view on dimensional analysis known as Effective Field Theory. This approach systematically distills a physical problem to the essential degrees of freedom that are relevant for modeling the dynamics of interest. After discussing some intuitive examples, I will describe a situation where these techniques have recently been put to use by myself and collaborators: heavy dark matter annihilations relevant for indirect detection. I will expose an issue with the standard Feynman diagram perturbation theory that arises when attempting to predict the annihilation rate. I will then sketch how Effective Field Theory techniques can be used to restore our ability to calculate in a controlled way, allowing us to produce a precision prediction that is relevant for current and future experiments.
Location: Room 100, Willamette hall
Host: Laura Jeanty
Please join us for a catered reception at 3:40pm in the Paul Olum, Willamette Hall Atrium.