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The formation and growth of supermassive black holes
Quasars are the most luminous objects in the universe powered by accretion onto supermassive black holes (SMBHs). They can be observed at the earliest cosmic epochs, providing unique insights into...
Sep 17, 2020
Protected spin characters, link invariants, and q-nonabelianization
In this talk I will describe a new link "invariant" (with certain wall-crossing properties) for links L in a three-manifold M, where M takes the form of a surface times...
Sep 17, 2020
Halo gas thermodynamics from the cosmic microwave background: implications for large-scale structure and galaxy formation
Understanding galaxy formation is an outstanding problem in Astrophysics. The feedback processes that drive it, exploding stars and accretion onto supermassive black holes, are poorly understood. This results in an...
Sep 22, 2020
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