Method for comparing finite temperature field theory results with lattice data

Cvetic G, Kögerler R (2007)
PHYSICAL REVIEW D 75(5): 054016.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Abstract / Bemerkung
The values of the presently available truncated perturbative expressions for the pressure of the quark-gluon plasma at finite temperatures and finite chemical potential are trustworthy only at very large energies. When used down to temperatures close to the critical one (T-c), they suffer from large uncertainties due to the renormalization scale freedom. In order to reduce these uncertainties, we perform resummations of the pressure by applying two specific Pade-related approximants to the available perturbation series for the short-distance and for the long-distance contributions. In the two contributions, we use two different renormalization scales which reflect different energy regions contributing to the different parts. Application of the obtained expressions at low temperatures is made possible by replacing the usual four-loop (MS) over bar beta function for alpha(s) by its Borel-Pade resummation, thus eliminating the unphysical Landau singularities of alpha(s). The obtained results are remarkably insensitive to the chosen renormalization scale and can be compared with lattice results-for the pressure p, the chemical potential contribution Delta p to the pressure, and various susceptibilities. A good qualitative agreement with the lattice results is revealed down to temperatures close to T-c.
Erscheinungsjahr
Zeitschriftentitel
PHYSICAL REVIEW D
Band
75
Zeitschriftennummer
5
Artikelnummer
054016
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Cvetic G, Kögerler R. Method for comparing finite temperature field theory results with lattice data. PHYSICAL REVIEW D. 2007;75(5): 054016.
Cvetic, G., & Kögerler, R. (2007). Method for comparing finite temperature field theory results with lattice data. PHYSICAL REVIEW D, 75(5), 054016. doi:10.1103/PhysRevD.75.054016
Cvetic, G., and Kögerler, R. (2007). Method for comparing finite temperature field theory results with lattice data. PHYSICAL REVIEW D 75:054016.
Cvetic, G., & Kögerler, R., 2007. Method for comparing finite temperature field theory results with lattice data. PHYSICAL REVIEW D, 75(5): 054016.
G. Cvetic and R. Kögerler, “Method for comparing finite temperature field theory results with lattice data”, PHYSICAL REVIEW D, vol. 75, 2007, : 054016.
Cvetic, G., Kögerler, R.: Method for comparing finite temperature field theory results with lattice data. PHYSICAL REVIEW D. 75, : 054016 (2007).
Cvetic, G., and Kögerler, Reinhart. “Method for comparing finite temperature field theory results with lattice data”. PHYSICAL REVIEW D 75.5 (2007): 054016.

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arXiv: hep-ph/0612130

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