# The 35th International Symposium on Lattice Field Theory

18-24 June 2017
Palacio de Congresos
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# Contribution Parallel

Auditorio Manuel de Falla
Nonzero Temperature and Density

# An improved estimate for the photon rate from lattice QCD - part 2

## Speakers

• Mr. Aman STEINBERG

## Content

In order to estimate the photon rate from the Euclidean vector current correlation functions, an inverse problem for the vector-channel spectral function must be solved. We use both a direct model for the spectral function and a model-independent estimate from the Backus-Gilbert method to give a robust estimate for the photon rate at momenta close to its maximum. At low photon momenta, the existence of a narrow diffusion pole in the retarded correlation -- a universal hydrodynamic prediction -- makes the extraction of the photon rate challenging. The results are compared with recent predictions from pure gauge theory and weak-coupling effective theory at two different temperatures.