Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-05-23
Nucl.Phys.B754:146-177,2006
Physics
High Energy Physics
High Energy Physics - Theory
28 pages, 37 figures. Matches published version in Nuclear Physics B
Scientific paper
10.1016/j.nuclphysb.2006.07.011
We compute higher order contributions to the free energy of noncommutative quantum electrodynamics at a nonzero temperature $T$. Our calculation includes up to three-loop contributions (fourth order in the coupling constant $e$). In the high temperature limit we sum all the {\it ring diagrams} and obtain a result which has a peculiar dependence on the coupling constant. For large values of $e\theta T^2$ ($\theta$ is the magnitude of the noncommutative parameters) this non-perturbative contribution exhibits a non-analytic behavior proportional to $e^3$. We show that above a certain critical temperature, there occurs a thermodynamic instability which may indicate a phase transition.
Brandt Fernando T.
Frenkel Josif
Muramoto C. M.
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