Nexttoleading order thermal spectral functions in the perturbative domain
Abstract
Motivated by applications in thermal QCD and cosmology, we elaborate on a general method for computing nexttoleading 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 imaginarytime correlators which can be compared with lattice simulations) for scalar and pseudoscalar densities in pure YangMills theory. Our results may turn out to be helpful in nonperturbative 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.
 Publication:

Journal of High Energy Physics
 Pub Date:
 September 2011
 DOI:
 10.1007/JHEP09(2011)084
 arXiv:
 arXiv:1108.1259
 Bibcode:
 2011JHEP...09..084L
 Keywords:

 Thermal Field Theory;
 NLO Computations;
 Lattice Gauge Field Theories;
 High Energy Physics  Phenomenology;
 High Energy Physics  Lattice
 EPrint:
 24 pages plus detailed appendices. v2: minor improvements