PoS - Proceedings of Science
Volume 430 - The 39th International Symposium on Lattice Field Theory (LATTICE2022) - Non-zero Temperature
Estimation of the photon production rate using imaginary momentum correlators
C. Török*, M. Cè, T. Harris, A. Krasniqi, H. Meyer and S. Ruhl
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Pre-published on: January 27, 2023
Published on: April 06, 2023
Abstract
The thermal photon emission rate is determined by the spatially transverse, in-medium spectral
function of the electromagnetic current. Accessing the spectral function using Euclidean data
is, however, a challenging problem due to the ill-posed nature of inverting the Laplace trans-
form. In this contribution, we present the first results on implementing the proposal of directly
computing the analytic continuation of the retarded correlator at fixed, vanishing virtuality of the
photon via the calculation of the appropriate Euclidean correlator at imaginary spatial momen-
tum. We employ two dynamical O(𝑎)-improved Wilson fermions at a temperature of 250 MeV.
DOI: https://doi.org/10.22323/1.430.0193
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