We describe a general principle of completeness in QFT. It asserts that the physical observable algebras produced by local degrees of freedom are the maximal ones compatible with causality. We elaborate on equivalent statements to this principle such as the non-existence of generalized symmetries and the uniqueness of the net of algebras. For…

I will discuss string theory compactifications where a large number of moduli is stabilized by fluxes. I will present a conjecture which rules out the stabilization of all complex-structure moduli in F-theory at a generic point in moduli space by fluxes that satisfy the tadpole cancellation condition. Evidence for this conjecture comes from…

Moiré materials, stacked 2D atomic layers with a small twist angle or a slight lattice mismatch, have become emerging platforms to study the physics of correlation, topology, and the interplay between the two. In this talk, I will discuss our exploration of correlated and topological states in the twisted graphene multilayers,…

The most celebrated corners of machine learning over the past decades are those successful at predicting - e.g., spam classification, medical diagnoses, or cat faces. But machine learning as actually used in practice is commonly prescriptive rather than predictive: decisions must be made in order to maximize a reward. The…

Abstract: Supermassive black holes create powerful jets of radiation and plasma particles that move close to the speed of light. The answers to the questions “how exactly are jets powered by energy extraction from a black hole” and “what are the processes that energize plasma particles” are crucial to understanding the observed activity. Recent…

Tuesday, December 7, 2021, 2 pm - 3 pm

All working groups will present ~5-10 minutes of updates on their ongoing projects. We're looking forward to seeing you all then!

(Check emails or the EDI Slack channel for an update on location and/or Zoom link.)

Many innate behaviors are the result of multiple sensorimotor programs that are dynamically coordinated to produce higher-order behaviors such as courtship or architecture. Extended phenotypes such as architecture are especially useful for ethological study because the structure itself is a physical record of behavioral intent. A particularly…

What happens when two masses scatter? This deceptively simple question has produced a series of surprises that touch on deep issues in general relativity, such as the localizability of gravitational field energy, the notion of asymptotic flatness at timelike infinity, and observability of particle position. Most recently, we found that the…

One might expect high-temperature transport to be incoherent and diffusive. However, many experimentally relevant one-dimensional systems, such as the Heisenberg and Hubbard models, feature long-lived quasiparticles that give rise to anomalous transport. I will present a quantitative theory of high-temperature transport in such systems, in…

This workshop will focus on quantum gravity with the goal of unraveling the quantum mechanical structure of spacetime. The Scientific Program will be held in-person and also via Zoom and YouTube livestream.

This workshop is sponsored by the Simons Foundation It from Qubit collaboration and is followed by the collaboration Annual…

I will show that every three-dimensional N=4 superconformal field theory on the squashed sphere contains a set of protected operators whose correlation functions are governed by a one-dimensional theory. This one-dimensional theory arises from supersymmetric localization with respect to a special supercharge which is not contained in any N=2…

Like most physical systems, in active matter, the characteristics of interaction play an important role. For example, the extent of attraction can switch a collective of particles from a homogeneous mixture to phase-separated clusters. Further, particle concavity in shape-changing active systems can change…

Noble Liquid Time Projection Chambers are ubiquitously used in the field of rare events searches such neutrinoless double beta decay or dark matter. A detailed understanding of light and charge transport in liquid xenon or liquid argon is of the utmost importance when modeling the performance of these experiments. In this talk I will present…

The ability to control particles in the quantum regime at the individual particle level has been a long sought goal in the

realm of quantum science for the past few decades. Such individually controlled entities could then serve as building

blocks for quantum simulators and computers. Of the many quantum objects developed in pursuit…

**Special seminar with Dicke fellowship candidate: ****Giovanni Scuri, Harvard University**

Abstract: The twist degree of freedom provides a powerful tool for engineering the electrical and optical properties of van der Waals (vdW) heterostructures. In this talk, I will show how the twist angle between two…

**Special seminar with Dicke fellowship candidate: Cheng Zang****, Caltech University**

The inflationary theory has been added into the picture of the well-established lambda cold dark matter (ΛCDM) standard model to explain the initial conditions of our universe. The quantum fluctuations in the early…

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