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Effective entropy of quantum fields coupled with gravity
Entanglement entropy quantifies the amount of uncertainty of a quantum state. For quantum fields in curved space, entanglement entropy of the quantum field theory degrees of freedom is well-defined for...
Sep 22, 2020
Can you make a magnet out of carbon?
In most materials, electrons fill bands, starting from the lowest kinetic energy states. The Fermi level is the boundary between filled states below and empty states above. This is the...
Sep 23, 2020
Sample-efficient learning of quantum many-body hamiltonians
We study the problem of learning the Hamiltonian of a quantum many-body system given samples from its Gibbs (thermal) state. The classical analog of this problem, known as learning graphical...
Sep 23, 2020
Diophantine approximation as Cosmic Censor for AdS black holes
The statement that general relativity is deterministic finds its mathematical formulation in the celebrated ‘Strong Cosmic Censorship Conjecture’ due to Roger Penrose. I will present my recent results on this...
Sep 24, 2020
Quantum Raychaudhuri Equation: Implications for spacetime singularities and the quantum origin of Lambda
The Raychaudhuri equation predicts the convergence of geodesics and gives rise to the singularity theorems. The quantum Raychaudhuri equation (QRE), on the other hand, shows that quantal trajectories, the quantum...
Sep 24, 2020
Composite fermi liquids and non-commutative field theory
The interplay between topology, strong correlations, and kinetic energy presents a new challenge for the theory of quantum matter. In this talk I will describe some recent progress on understanding...
Sep 28, 2020
Towards Microscopic Models of Big Bang Cosmology
In this talk, we review an approach to describing cosmological physics using ordinary AdS/CFT, where the cosmological physics is the effective description of an end-of-the-world brane which cuts off the...
Sep 29, 2020
Search for Lensed Gravitational Waves from LIGO/Virgo Binary Black Hole Mergers: Intriguing Candidates in O2
Current and forthcoming observing runs at ground-based laser interferometry detectors are starting to uncover gravitational waves from binary black hole (BBH) mergers at cosmological distances, and a fraction of them...
Sep 29, 2020
Topological Metals
One of the major themes of the modern condensed matter physics is the study of materials with nontrivial electronic structure topology. Particularly significant progress in this field has happened within...
Sep 30, 2020