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Two dimensional conformal field theories (CFTs) have a very powerful property called modular invariance, which relates the high and low temperature limits of the theory.  This can give nontrivial relations between the low-energy spectrum of the theory and the high-energy spectrum. By making very... more
Quantum gravity in anti de Sitter space in three spacetime dimensions is conjectured to be dual to two dimensional conformal field theories (CFTs) with sparse spectra. In this paper, we study "pure" quantum gravity in three dimensions, which is in some sense the simplest place to study quantum... more
One of the most powerful mathematical principles guiding our current understanding of quantum physics is symmetry. We encounter many symmetric objects in our daily life—a square can be rotated about its center in increments of 90 degrees and look the same, while a circle can be rotated any angle.... more
Dec 30 2015 | Posted In: Hard Problems
If a pebble is thrown into a black hole, an observer outside the black hole will see waves of energy diffuse outwards along the event horizon. The equations obeyed by this diffusion process turn out to be precisely those that describe the flow of energy in what are known as `strongly correlated... more
The Cosmic Axion Spin Precession Experiment (CASPEr) has received funding for phase 1 from the Heising-Simons and Simons Foundations.  CASPEr is designed to detect axion dark matter over a broad range of masses that are unreachable by other techniques. more