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The Fascinating, Weird World of Quantum Matter
In her December 2 Perimeter Public Lecture webcast, Hallberg will explore examples of emergent phenomena and demonstrate how we can tackle these problems using quantum information to filter the most...
Dec 02, 2020
QED-mediated plasma processes in compact objects: magnetic reconnection and beyond
In compact astrophysical objects, such as neutron star magnetospheres, black-hole accretion disk coronae and jets, the main energy reservoir is the magnetic field. The plasma processes such as magnetic reconnection...
Dec 03, 2020
Quantum black holes without strings
The quantum states of matter in the immediate vicinity of a black hole can be studied using no other information than Standard Model physics combined with perturbative gravity. The point...
Dec 03, 2020
q-Opers, QQ-Systems, and Bethe Ansatz
We introduce the notions of (G,q)-opers and Miura (G,q)-opers, where G is a simply-connected complex simple Lie group, and prove some general results about their structure. We then establish a...
Dec 03, 2020
Measurement phase transitions and statistical mechanics
A many-body quantum system that is continually monitored by an external observer may be in distinct dynamical phases, depending on whether or not the observer’s repeated local measurements prevent the...
Dec 07, 2020
Torsion cosmology and beyond
Torsion is a popular ingredient in gravity, yet fraught with quantum and classical pathologies. I develop a novel torsion theory, consistent with power-counting and unitarity. The Friedmann equations emerge (with...
Dec 08, 2020
New Pathways to the Relic Abundance of Vector-Portal Dark Matter
In the conventional weakly-interacting massive particle (WIMP) paradigm the late-time density of dark matter (DM) is set by the rate of two-body annihilations, but there has been considerable recent interest...
Dec 08, 2020
Lattice homotopy: the physics of moving things around and calling them the same
While the concept of topology is often introduced by contrasting oranges with bagels, the idea of topologically distinct quantum phases of matter is far more abstract. In this talk, we...
Feb 25, 2020
New Perspectives from Gravity's Extremes
Beginning with the landmark gravitational wave detections by LIGO/Virgo, we have been gaining an unprecedented view of the dynamics of strongly curved spacetime originally predicted by Einstein. Enabling and motivated...
Feb 26, 2020