## Events - Daily

**October 28, 2013**>>

Monday,
October 28 |
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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. |