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Estimation of the photon production rate using imaginary momentum correlators
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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 transform. 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 momentum. We employ two dynamical O(a)-improved Wilson fermions at a temperature of 250 MeV.
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Cited by 1 Pith paper
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Probing how bright the quark-gluon plasma glows in lattice QCD
At T≈254 MeV, lattice QCD gives -[HE(ω2)-HE(ω1)]/T^2 = 0.193(74), on the low side of the AMY weak-coupling prediction interval [0.25,0.30].
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