| Thursday, November 4, 2021 |
| Bootstrapping N = 4 super-Yang-Mills on the conformal manifold | |
| Shai Chester | |
| Event Type: HEP Seminar | |
| Time: 2:15 PM - 3:45 PM | |
| Location: 726 Broadway, 940, CCPP Seminar | |
| Abstract: Abstract: We study the N = 4 SYM stress tensor multiplet 4-point function for any value of the complexified coupling tau, and in principle any gauge group we focus on SU2 and SU3 for simplicity. By combining non-perturbative constraints from the numerical bootstrap with two exact constraints from supersymmetric localization, we are able to compute upper bounds on low-lying CFT data e.g. the Konishi for any value of tau. These upper bounds are very close to the 4-loop weak coupling predictions in the appropriate regime. We also give preliminary evidence that these upper bounds become small islands under reasonable assumptions, in which case our method would provide a numerical solution to N = 4 SYM for any gauge group and tau. | |
| Active Topology | |
| Cristina Marchetti, University of California Santa Barbara | |
| Event Type: Physics Dept Colloquium | |
| Time: 4:00 PM - | |
| Location: 726 Broadway, 940, CCPP Seminar | |
| Abstract: Topology plays a key role in condensed matter physics, underlying much of our understanding of equilibrium matter in terms of defects in ordered media and topologically protected states. In active systems – collections of entities that consume energy to generate their own motion and forces – topological phenomena can take on new and surprising roles. I will describe some of these behaviors focusing on liquid-crystalline active matter in two dimensions, specifically active nematic liquid crystals, where defects become motile particles, drive spatio-temporally chaotic flows, and can themselves organize in emergent ordered states. | |