Importance of asymptotic freedom for the pseudocritical temperature in magnetized quark matter
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Data
2014-08-11
Autores
Farias, R. L. S.
Gomes, K. P.
Krein, G. [UNESP]
Pinto, M. B.
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Amer Physical Soc
Resumo
Although asymptotic freedom is an essential feature of QCD, it is absent in effective chiral quark models like the Nambu-Jona-Lasinio and linear sigma models. In this work we advocate that asymptotic freedom plays a key role in the recently observed discrepancies between results of lattice QCD simulations and quark models regarding the behavior of the pseudocritical temperature T-pc for chiral-symmetry restoration in the presence of a magnetic field B. We show that the lattice predictions that T-pc decreases with B can be reproduced within the Nambu-Jona-Lasinio model if the coupling constant G of the model decreases with B and the temperature. Without aiming at numerical precision, we support our claim by considering a simple ansatz for G that mimics the asymptotic-freedom behavior of the QCD coupling constant 1/alpha(s) similar to ln(eB/Lambda(2)(QCD)) for large values of B.
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Physical Review C. College Pk: Amer Physical Soc, v. 90, n. 2, 6 p., 2014.