Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-05-06
Phys.Rev.D80:034014,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 7 figures, RevTeX4. Published version, with enlarged abstract and minor changes in the main text
Scientific paper
10.1103/PhysRevD.80.034014
We study the response of the QCD vacuum to an external abelian chromomagnetic field in the framework of a non local Nambu-Jona Lasinio model with the Polyakov loop. We use the Lattice results on the deconfinement temperature of the pure gauge theory to compute the same quantity in the presence of dynamical quarks. We find a linear relationship between the deconfinement temperature with quarks and the squared root of the applied field strength, $gH$, in qualitative (and to some extent also quantitative) agreement with existing Lattice calculations. On the other hand, we find a discrepancy on the approximate chiral symmetry restoration: while Lattice results suggest the deconfinement and the chiral restoration remain linked even at non-zero value of $gH$, our results are consistent with a scenario in which the two transitions are separated as $gH$ is increased.
Campanelli Leonardo
Ruggieri Marco
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