Next-to-leading order thermal spectral functions in the perturbative domain

Details Next-to-leading order thermal spectral functions in the perturbative domain Next-to-leading order thermal spectral functions in the perturbative domain

2011-08-05

arxiv.org/abs/1108.1259v2

JHEP 1109:084,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages plus detailed appendices. v2: minor improvements; published version

Scientific paper

Motivated by applications in thermal QCD and cosmology, we elaborate on a general method for computing next-to-leading order spectral functions for composite operators at vanishing spatial momentum, accounting for real, virtual as well as thermal corrections. As an example, we compute these functions (together with the corresponding imaginary-time correlators which can be compared with lattice simulations) for scalar and pseudoscalar densities in pure Yang-Mills theory. Our results may turn out to be helpful in non-perturbative estimates of the corresponding transport coefficients, which are the bulk viscosity in the scalar channel and the rate of anomalous chirality violation in the pseudoscalar channel. We also mention links to cosmology, although the most useful results in that context may come from a future generalization of our methods to other correlators.

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