• High Energy Theory Seminar: "Entanglement at a Scale and Recovery Maps"

    David Rittenhouse Laboratory, 2N36

    Nima Lashkari (MIT)

    I discuss the amount of information in quantum field theory states reduced to a region, that cannot be recovered from its subregion density matrices. One can reconstruct the density matrix from its subregions using recovery maps. The vacuum of a conformal field theory is a quantum Markov state and the fixed point of both transformations. I define the entanglement of scaling as a measure of entanglement at a scale, and mention connections with C-theorems proofs in 2, 3 and 4 dimensions.

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  • High Energy Theory Seminar: "BMS Invariant Fluids"

    David Rittenhouse Laboratory, 2N36

    Robert Penna (Columbia University)

    The Bondi-van der Burg-Metzner-Sachs (BMS) group is the asymptotic symmetry group of asymptotically flat spacetime.  It is related to flat gravity in the same way that the conformal group is related to anti de Sitter gravity.  However, while the conformal group is well known throughout field theory, the BMS group is rather mysterious.  We show that the BMS group is closely related to infinite dimensional symmetry groups governing fluid dynamics.  We use a relationship between gravitating systems and lower dimensional fluids on their boundaries to give a new derivation of

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  • Condensed Matter Seminar: "Striped Ground States in the Hubbard Model"

    David Rittenhouse Laboratory, A4

    Steven White (University of California, Irvine)

    Solving the 2D Hubbard model is one of the most well-known outstanding problems in theoretical condensed matter physics. Various simulation techniques, such has DMRG and quantum Monte Carlo, have made dramatic strides in recent years, but they have still not provided clearcut answers for the nature of the ground state of the strong-coupling doped model.

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  • High Energy Theory Seminar: (TBA)

    David Rittenhouse Laboratory, 2N36

    Matthew Reece (Harvard)

  • Rittenhouse Lecture: (TBA)

    David Rittenhouse Laboratory - A8

    Daniel Holz (Enrico Fermi Institute and Kavli Institute for Cosmology, U of Chicago) hosted by Bhuvnesh Jain

  • HET & HEE Joint Seminar: (TBA)

    Center for Particle Cosmology

    Josh Ruderman (NYU)