## Events - Weekly

**October 2013 >>**

Sunday,
October 27 |
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Monday,
October 28 |

High Energy Theory Seminar - IAS - Dam Thanh Son, University of Chicago - “The Geometry of the Quantum Hall Effect” We show how a diffeomorphism invariance of the quantum Hall systems, together with topological consideration, put strong constraints on the physics that goes beyond the Chern-Simons action. We show how the Hall conductivity at finite wavenumbers is constrained. We also derive new sum rules that govern the spectrum of low-energy excitations in a fractional quantum Hall system. We show how these sum rules can be saturated by a single quasiparticle which can be interpreted as a massive emergent graviton. We identify this massive graviton with the magneto-roton and discuss consequences for experiments. Bloomberg Lecture Hall - Institute for Advanced Study · 2:30 p.m.– 3:30 p.m. |

Tuesday,
October 29 |

HET Seminar-IAS-Amihay Hanany, Imperial College London, Hilbert Series for the Coulomb Branch of N=4 Supersymmetric Gauge Theories in 3 Dimensions This paper addresses a long standing problem - to identify the chiral ring and moduli space on the Coulomb branch of an N = 4 superconformal field theory in 2+1 dimensions. Previous techniques involved a computation of the metric on the moduli space and/or mirror symmetry. These methods are limited to sufficiently small moduli spaces, with enough symmetry or to Higgs branches of sufficiently small gauge theories. We introduce a simple formula for the Hilbert series of the Coulomb branch which applies to any good or ugly three-dimensional N = 4 gauge theory. The formula counts monopole operators which are dressed by classical operators -- the Casimir invariants of the residual gauge group that is left unbroken by the GNO magnetic charges. We apply our formula to several classes of gauge theories. Along the way we make various tests of mirror symmetry successfully comparing the Hilbert series of the Coulomb branch with the Hilbert series of the Higgs branch of the mirror theory. Bloomberg Lecture Hall - Institute for Advanced Study · 1:30 p.m.– 2:30 p.m. |

Wednesday,
October 30 |

Thursday,
October 31 |

Friday,
November 1 |

High Energy Theory Seminar - IAS - Daniel McKinsey, Yale University, “First Results from the LUX Dark Matter Experiment” Bloomberg Lecture Hall - Institute for Advanced Study · 11:00 a.m.–12:00 p.m. |

Saturday,
November 2 |