Microbial ecosystems and their metabolic activity play a fundamental but poorly understood role at multiple scales, from human health to biogeochemical cycles. In fact, metabolism, in addition to being the “engine” of every living cell, mediates competition and cross-feeding between different species, and dictates how cells interact with their…

One major open problem in quantum information theory is how to build a quantum hard drive, i.e. a quantum mechanical system that can store quantum information reliably for a very long time without active error correction. No completely satisfying solution to this problem has been found, but in the search for possibilities a whole new class of…

I will talk about recent experiments on the chiral anomaly in Dirac semimetals. In field theory, Dirac fermions of zero mass must segregate into left- and right-handed populations that do not ever mix. In this limit, chiral symmetry (handedness) is a global symmetry of the Lagrangian. However, quantum effects induced by coupling to a vector…

Quantum-critical strongly correlated systems feature universal collision-dominated collective transport. Viscous electronics is an emerging field dealing with systems in which strongly interacting electrons flow like a fluid. Such flows have some remarkable properties never seen before. I shall describe recent theoretical and experimental works…

**The talk will present some of the recent progress in mathematical studies of critical phenomena of classical statistical mechanical systems. Through the relation of quantum systems to classical systems in d+1 dimensions, some of these new results also yield new understanding of the ground states of a class of quantum spin chains with a…**

**1944 saw the height of the United States Manhattan Project efforts which was distributed between Los Alamos New Mexico, Oak Ridge Tennessee, and Hanford Washington. Since the Manhattan Project was spurred by the fear that Germany was building her own nuclear weapons, Allied anxiety continuously pondered the Nazi atomic progress. As…**

From critical phenomena to quantum gravity, conformal field theories describe the universal scale-invariant structures that lie at the heart of theoretical physics. The conformal bootstrap is the powerful idea, dating back to the 70’s, that one can use fundamental consistency conditions to constrain, solve, and map out the space of conformal…

**The Gaia mission is in the process of mapping nearly 1% of the Milky Way’s stars. This data set is unprecedented and provides a unique view into the formation history of our Galaxy and its associated dark matter halo. I will review results based on the most recent Gaia data release, which demonstrate that the inner Galaxy is dominated…**

Ultracold fermions in optical lattices provide a clean physical realization of the celebrated Fermi-Hubbard model of condensed matter, a minimal model believed to contain the essential ingredients for high-temperature superconductivity. Recent advances in the field of quantum gas microscopy have opened up the possibility to probe and manipulate…

The standard model of particle physics is approaching the half-century mark. I shall discuss what we have learned and where we might be headed.

David Gross is the Chancellor's Chair and Professor of Theoretical Physics at the Kavli Institute for Theoretical Physics at UC-Santa Barbara and a Nobel Laureate in Physics, 2004.

Why is the universe composed only of matter, with negligible anti-matter? Is the neutrino its own anti-particle? These two seemingly disparate questions may be linked through *leptogenesis*–a theory which postulates massive neutrinos that break matter-antimatter asymmetry and could yield the universe we observe, inhabit and explore today…

The celebrated Brascamp-Lieb (BL) inequalities, and their reverse form of Barthe, is a powerful framework which unifies and generalizes many important inequalities in analysis,

convex geometry and information theory.

I will exemplify BL inequalities, building to the general set-up. I will describe the structural theory that…

I will review key computational aspects of navigation and describe the brain’s circuits that underlie it. These circuits contain neurons with remarkable responses to spatial variables, including head direction cells, grid cells, and place cells. I’ll describe the likely unifying mechanism for memory and (vector) integration of velocity signals…

The understanding of strongly correlated quantum matter has challenged physicists for decades. Such difficulties have stimulated new research paradigms, such as ultra-cold atom lattices for simulating quantum materials. In this talk I will present a new platform to investigate strongly correlated physics, based on graphene moiré superlattices…

How is living matter organized in space and time during multicellular morphogenesis? A comparative view across animals and plants suggests that the answer may lie in reusing just a few geometric and topological organ-sculpting motifs. Using examples, I will discuss the qualitative and quantitative basis for three of these motifs: elongation,…

Einstein’s theory of general relativity tells us that gravity comes from curved space-time geometry. The space-time is like a plastic membrane which we can stretch with our energy and momentum. But what is this membrane made of? What glues the spacetime together? These questions are not philosophical, but have to be understood in order to…

I will discuss recent developments regarding new types of hadrons involving heavy quarks: hadronic molecules, doubly heavy baryons, stable tetraquarks and others. I will also explain how the discovery of the doubly heavy baryon leads to quark-level analogue of nuclear fusion, with energy release per reaction an order of magnitude greater than…

The Standard Model of particle physics has been a smashing success at the high energies newly tested at the Large Hadron Collider (LHC). The LHC's discovery of the Higgs boson completes the Standard Model and bears out one of its most puzzling predictions. I will explain why we know the Standard Model must be incomplete, and how the Higgs boson…

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