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.

# Events Archive

## 2021

### University Closed

### University closed

### IAS HET SEMINAR | Javier Magan, University of Pennsylvania | "A New Look at Completeness and Generalized Symmetries" | Wolfensohn Hall (behind Bloomberg Hall) & Zoom

### HET Seminar | Severin Lust, Harvard | "The Tadpole Problem" | PCTS 407 & via Zoom

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...

### PQI seminar: "Correlated and Topological States in Twisted Graphene Multilayers"

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.

### Biophysics Seminar: Chris Wiggins, Columbia University|TBD|Zoom

### Biophysics Seminar: Chris Wiggins, Columbia University| Just do the best you can: statistical physics approaches to reinforcement learning

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.

### PGI Fall Seminar Series|Alexander (Sasha) Philippov|Flatiron Institute| "Dynamics of Collisionless Plasmas and Flares at the Event Horizon"

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.

### EDI initiative "All Hands" meeting

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.)

### Biophysics Seminar: Andrew Gordus, Johns Hopkins University| Untangling the web of behaviors used in spider orb-weaving

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.

### PGI Fall Seminar Series| Sam Gralla| University of Arizona|"Surprises in Gravitational Scattering"

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.

### Princeton Quantum Colloquium: Surprises in High-Temperature Transport

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.

### HET | It from Qubit Conference | Workshop on Quantum Information and Spacetime | Wolfensohn Hall

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 Meeting...

### HET Seminar | Pieter Bomans | "One-dimensional sectors from the squashed three-sphere" | PCTS 407 & Zoom

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.

### Special Seminar, Dicke Candidate Shengkai Li, Georgia Institute of Technology, "Field-mediated Interaction in Active Matter" December 3, 2021, Jadwin 481

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.

### Special Seminar, Dicke Candidate Ako Jamil, Yale University, "Light and Charge Transport in Liquid Xenon Detectors for Rare Event Searches" December 2, 2021 Jadwin 481

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.

### Assembling an optical tweezer array of fully quantum-state controlled polar molecules

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...

### Special Seminar w/Dicke candidate Giovanni Scuri (Harvard): “Engineering exciton properties in atomically thin semiconductors via the twist angle"

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

### Special Seminar w/Dicke candidate Cheng Zang (Caltech): “The development and deployment of the first BICEP Array receiver at 30/40 GHz"

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

### PRISM/PCCM Seminar "Dynamic Speckle Holography: Probing Strain Fields in Fractured Materials"

**Speaker: Prof. David Weitz, Harvard, **Department of Physics **Hosts: **Prof. Sujit Datta and Prof. Pierre-Thomas Brun, Princeton CBE