Wednesday, January 16, 2013

1301.3449 (Aleksi Vuorinen et al.)

Bulk and shear spectral functions in weakly and strongly coupled
Yang-Mills theory

Aleksi Vuorinen, Martin Krssak, Yan Zhu
In this talk, we discuss a number of recent calculations aimed at determining the spectral functions corresponding to various components of the energy momentum tensor in high-temperature SU(N) Yang-Mills theory. The computations reviewed include applications of both weak coupling and gauge/gravity techniques, and thus enable one to access different limits of the quantities. The motivation for the work is twofold: On one hand, the results are hoped to aid the eventual nonperturbative extraction of the bulk and shear viscosities from lattice data, while on the other hand they also enable an immediate comparison of the lattice, perturbative and holographic predictions for certain Euclidean correlators.
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