Research Seminars @ Illinois

View Full Calendar

Tailored for undergraduate researchers, this calendar is a curated list of research seminars at the University of Illinois. Explore the diverse world of research and expand your knowledge through engaging sessions designed to inspire and enlighten.

To have your events added or removed from this calendar, please contact OUR at

Nuclear Physics Seminar - Andy Lucas (UC Boulder) "Generalized time-reversal symmetry and effective theories for nonequilibrium systems"

Event Type
Physics Department
464 Loomis
Mar 25, 2024   1:00 pm  
Andy Lucas
Brandy Koebbe
Originating Calendar
Physics - Nuclear Physics Seminar

The past decade has seen extensive work on building a systematic Wilsonian effective field theory for dissipative and stochastic dynamics in systems in thermal equilibrium: in particular, an effective field theory of hydrodynamics.   In this talk, I will argue that the same principles that underlie this construction can also be applied to certain systems that are not in equilibrium.  In particular, I will discuss the classification of generic stochastic dynamics that drive a few- or many-body system towards a target statistical steady state.  Such models come with a natural notion of time-reversal symmetry, which can be broken in controlled ways, leading to nonequilibrium dynamical universality classes. I will overview the application of our approach in two many-body settings: (1) “odd elasticity”, which generalizes the conventional theory of solid mechanics to active systems; (2) a cartoon model of “failed flocking” — an O(2) rotor model on the square lattice where spins appear to “flock” in the direction they are pointing, and yet no long-range order can arise, in contrast to prior field-theoretic expectations.  Our methods can lead to a more systematic classification of nonequilibrium dynamical universality classes and a more detailed understanding of (emergent) symmetries in nonequilibrium effective theories. 

link for robots only