Spectral function for overoccupied gluodynamics from real-time lattice simulations
Boguslavski, K., Kurkela, A., Lappi, T., & Peuron, J. (2018). Spectral function for overoccupied gluodynamics from real-time lattice simulations. Physical Review D, 98(1), 014006. https://doi.org/10.1103/PhysRevD.98.014006
Published inPhysical Review D
© the Authors, 2018. Published by the American Physical Society.
We study the spectral properties of a highly occupied non-Abelian nonequilibrium plasma appearing ubiquitously in weak coupling descriptions of QCD matter. The spectral function of this far-fromequilibrium plasma is measured by employing linear response theory in classical-statistical real-time lattice Yang-Mills simulations. We establish the existence of transversely and longitudinally polarized quasiparticles and obtain their dispersion relations, effective mass, plasmon frequency, damping rate and further structures in the spectral and statistical functions. Our new method can be interpreted as a nonperturbative generalization of hard thermal loop (HTL) effective theory. We see indications that our results approach leading order HTL in the appropriate limit. The method can also be employed beyond the range of validity of HTL.
PublisherAmerican Physical Society
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Related funder(s)Academy of Finland; European Commission
Funding program(s)Research post as Academy Research Fellow, AoF; Research costs of Academy Research Fellow, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingWe are grateful to Jürgen Berges, Jacopo Ghiglieri and Asier Piñeiro Orioli for valuable discussions and would like to thank Asier Piñeiro Orioli for sharing with us the method in Eq. (44) in a private communication. T. L. is supported by the Academy of Finland, Projects No. 267321 and No. 303756. This work is supported by the European Research Council, Grant No. ERC-2015-CoG-681707. J. P. is supported by the Jenny and Antti Wihuri Foundation. J. P. acknowledges support for travel from the Magnus Ehrnrooth Foundation. K. B. and J. P. would like to thank CERN and its Theory group for hospitality during part of this work. The authors wish to acknowledge CSC-IT Center for Science, Finland, for computational resources. ...
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