Speakers
Paul Romatschke
(FIAS Frankfurt)
Paul Romatschke
(University of Colorado, Boulder)
Description
Transport properties are hard to calculate from first
principles for any value of the coupling. At strong coupling, it's
generally considered impossible except for field theories with known
gravity duals. In this talk I will review large N approaches to simple
scalar and fermion field theories and show that they allow for the
determination of exact transport coefficients at strong coupling,
directly from the field theory. As an example, I calculate the (large
N exact) infinite coupling value of eta/s in the 3d O(N) model.
