Title: Soliton and Vortex Patterns: From BECs to Quantum Droplets & Beyond 

Title: Vortices and vortex rings in quantum superfluids: a quasi-particle approach

Abstract: Motivated by recent experiments studying 2D vortex dynamics in Bose-Einstein condensates (BECs), we illustrate that, by considering these vortices as quasi-particles, such systems can be accurately described by reduced models of coupled ordinary differential equations. It is then possible to study in detail the dynamics, stability, and bifurcations of vortex configurations and match the ensuing results to experimental observations. We will also explore some extensions of the quasi-particle approach for 3D vortex rings which are formed when a vortex line (a "twister") is looped back onto itself creating a close ring that carries vorticity. We first showcase how vortex rings are commonplace in a wide range of fluids. We then focus on the occurrence of vortex rings in BECs and their mutual interactions, collisions, and scattering scenarios.

Title: Electronic properties of unconventional magnets

Abstract: In addition to conventional magnets such as ferromagnets and antiferromagnets, unconventional magnets, such as altermagnets and p-wave magnets, have recently received significant attention. These unconventional magnets have even- and odd-parity spin polarizations in their electronic band structures while maintaining zero net magnetization. These band structures allow for rich transport phenomena and interaction effects. In the first part of the talk, I will show that despite the absence of bulk magnetization, the itinerant electrons in altermagnets can generate local magnetization close to interfaces and impurities. The second part of my talk will focus on p-wave magnets. I will present the derivation of the effective model of these systems and discuss its implications for tunneling magnetoresistance, transport, and superconductivity. These results expand our understanding of magnetism and contribute to the development of spintronics and quantum material research.

Title: Probing Cosmic Acceleration with Galaxy Clusters

Abstract: Our understanding of the Universe is at a critical juncture.  For decades, the standard model of cosmology based on general relativity, dark matter, and constant dark energy (ɅCDM) has passed many experimental tests.  However, the recent hint of evolving dark energy — with the possibility of a phantom dark energy — has the potential to challenge ɅCDM.  In this talk, I will discuss how we use galaxy clusters to measure the evolution of structure and to probe the nature of gravity at cosmological scales.   I will talk about how we use observations across the electromagnetic spectrum to understand the astrophysics of clusters, which in turn makes clusters better cosmological probes.  I will also discuss how we plan to combine galaxy clusters with other cosmological probes to measure the nature of dark energy.