Topological states of matter are characterized by topological invariants, which are physical quantities whose values are quantized and do not depend on details of the measured system. Among them the electrical Hall conductance, which is expressed in units of e2/h (e the electron charge, h the Planck constant), is easiest to probe. In the…

The past decades have seen rapid advances in our ability to probe and control atoms. The ability to bring atoms into the ultracold regime has opened up many applications, ranging from creating the most precise clocks to quantum simulation of condensed matter systems. Compared to atoms, molecules have a much richer internal…

Abstract: Quantum fields living on cosmological spacetimes can experience particle production due to their interaction with the evolving background. This effect is particularly relevant for models of the very early Universe, when the energy density generated through this process may back-react on the cosmological expansion. I will review the…

Abstract: A fracton is an unusual new type of emergent quasiparticle, first proposed in the context of quantum phases of matter, which does not have the ability to move by itself. Rather, fractons can only move by forming certain bound states. In this talk, I will show that symmetric tensor gauge theories provide a…

Abstract: In this talk, I will trace the interplay of science and technology in the context of semiconductor heterostructures and the quantum-hall effect (QHE), culminating in the discovery of the fractional QHE, and unfolding of its complex, hierarchical structure. Following that, I will give an overview of the fascinating phenomena that QHE…

TITLE: Beyond Space and Time

Abstract: The Lecture will explore the evolving concepts of space and time in physics.

Today our concepts of spacetime are once again challenged as we struggle to understand quantum gravity, unify the forces of nature…

Here is a partial list of our performers for the evening:

Lauren McGough

Grace C. McKenzie-Smith

Steven S. Gubser

David Liao

Yinan Zhang

Bill Yan Huang

…The South Pole Telescope (SPT) is a 10 meter CMB telescope located at the Amundsen Scott South Pole Station. From 2012 to 2017 SPTpol, the 1st polarization sensitive camera on the SPT, took observations of the CMB. In 2017 SPT-3G, a new camera with 2,700 tri-chroic pixels and 16,200 transition edge sensor bolometers was installed on the SPT. I…

Precise control over quantum systems is the foundation of quantum technology that will shape our society in revolutionary ways—from computation and simulation to sensing and communication. Alongside technological advances, better and better quantum control will enable new tests of fundamental physics. I will discuss our efforts on both…

The technique of layer-by-layer van der Waals (vdW) heterostructure allows any 2D material exfoliated from a bulk crystal to be reassembled into a designer architecture, making it possible to study the coupling and interplay between different emergent quantum phenomena through engineering new meta-materials. An example of such meta-material is…

Spontaneous emergence of orders is a recurring theme in physics that occurs at many different length scales. These orders emerge not because of the characteristics of the individual constituents, but because of the interactions amongst the participants that result in fantastically interesting collective behaviors. As an experimental condensed…

The talk will start with an introduction to Nature journals, in particular *Nature Reviews Physics*, which will launch in 2019 and is now open for submissions. I will then delve into the editorial processes and the journey an article undergoes between submission and publication, discussing what editors look for and what makes a Nature…

Speaker: Will Cook, Department of Applied Mathematics and Theoretical Physics, University of Cambridge

Abstract: In four dimensional General Relativity the properties of gravitational waves emitted in BH-BH mergers have been extensively studied using numerical relativity, largely in astrophysical settings. Understanding higher…

Speaker: Jerome Quintin, McGill University

Abstract: I will review the idea behind the matter bounce scenario as an alternative to inflation and highlight two of its problems: its instability with respect to anisotropies and its large tensor-to-scalar ratio. I will present two tentative resolutions to the latter in which curvature…

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