Spectral function for overoccupied gluodynamics from real-time lattice simulations - INSPIRE

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Spectral function for overoccupied gluodynamics from real-time lattice simulations

K. Boguslavski
(
- Jyvaskyla U.
)
,
A. Kurkela
(
- CERN and
- Stavanger U.
)
,
T. Lappi
(
- Jyvaskyla U. and
- Helsinki Inst. of Phys.
)
,
J. Peuron
(
- Jyvaskyla U.
)

Apr 5, 2018

20 pages

Published in:

Phys.Rev.D 98 (2018) 1, 014006

Published: Jul 7, 2018

e-Print:

1804.01966 [hep-ph]

DOI:

10.1103/PhysRevD.98.014006

Report number:

CERN-TH-2018-075

View in:

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Abstract: (APS)

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-from-equilibrium 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.

Note:

20 pages, 15 figures; v2: published version - references and footnotes added, minor revisions in the Abstract and Secs. III.E and IV

quantum chromodynamics: matter
higher-order: 0
spectral representation
spectral
lattice
plasma
hard thermal loop approximation
dispersion relation
quasiparticle
weak coupling

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