Archive of IAS Physics Group Meetings

Abstract: Not much is known about what happens at the end of black hole evaporation. Pushing the semi-classical evolution well beyond its regime of validity suggests that the final Cauchy slice breaks into a piece that remains behind the event...

Abstract: This talk will discuss the simplest model of neural nets, the multilayer perceptron. We will prove the basic properties of this model, and discuss three particular areas where physicists, especially high energy theorists, can contribute to...

Abstract: I will review non-geometric string constructions, focusing on asymmetric orbifolds and in particular quasicrystalline orbifolds, which freeze moduli and yield isolated vacua (“string islands”). In the supersymmetric case (N=8,16), these...

Abstract: Understanding quantum gravity in a closed universe is a long standing problem, where it is challenging even to discuss what observables are meaningful, particularly when thinking about dynamics. Indeed, most discussions in de Sitter are in...

Abstract: The Navier–Stokes (NS) equations describe fluid dynamics through a high-dimensional, nonlinear partial differential equations (PDEs) system. Despite their fundamental importance, their behavior in turbulent regimes remains incompletely...

Abstract: We develop a non-perturbative definition of RMT2: a generalization of random matrix theory that is compatible with the symmetries of two-dimensional conformal field theory. Given any random matrix ensemble, its n-point spectral...

Abstract: The 1+1-dimensional adjoint QCD theory (namely SU(N) gauge theory coupled to a Majorana fermion in the adjoint representation of the gauge group) has two curious properties.  When the fermion is massless, the theory exhibits screening of...

Abstract: Can we regularize chiral global symmetries and their anomalies on a lattice with a finite dimensional Hilbert space? We discuss how the vector and axial U(1) symmetries of a massless Dirac fermion in 1+1d are realized in the conventional...

Abstract: Energy and information are deeply connected in quantum field theory and quantum gravity. I will describe an explicit protocol for an observer outside a black hole to send in quantum information at zero energy cost. This clarifies what sort...