Events Daily

Thursday, May 2, 2024

The Hidden Universe Odyssey: From Theoretical Foundations to Cosmological Detections
Xucheng Gan
Event Type: Oral Defense
Time: 9:00 AM - 10:45 AM
Location: 726 Broadway, 940, CCPP Seminar

Non-perturbative Explorations on Quantum Field Theories
Conghuan Luo
Event Type: Oral Defense
Time: 2:00 PM - 3:50 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: COMMITTEE: Professor Sergei Dubovsky (Thesis Advisor) Professor Matthew Kleban Professor Aditi Mitra Professor Massimo Porrati Professor Yifan Wang

Defect Propelled Swimming of Nematic Colloids
Kathleen Stebe, University of Pennsylvania
Event Type: Physics Dept Colloquium
Time: 4:00 PM - 5:30 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: We have been studying active colloids in nematic liquid crystals as microrobots for materials manipulation. Colloid shape and surface chemistry can generate long-ranged emergent interactions in quasi-static settings. Furthermore, the non-linear response of the nematic fluid host allows interactions that differ strikingly in range and form from their static counterparts. Colloid dynamic displacement can introduce defects whose dynamics generate new modalities of motion and interaction. These interactions provide a rich toolkit for assembly and open important fundamental questions regarding swimming at low Reynolds number in a nematic, and the roles of broken symmetry, elastic energy storage and far from equilibrium topological defects.