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Journal Articles Journal of High Energy Physics Year : 2013

The Chern-Simons Diffusion Rate in Improved Holographic QCD

Abstract

In (3 + 1)-dimensional SU(N (c)) Yang-Mills (YM) theory, the Chern-Simons diffusion rate, Γ(CS), is determined by the zero-momentum, zero-frequency limit of the retarded two-point function of the CP-odd operator tr [F ∧ F ], with F the YM field strength. The Chern-Simons diffusion rate is a crucial ingredient for many CP-odd phenomena, including the chiral magnetic effect in the quark-gluon plasma. We compute Γ(CS) in the high-temperature, deconfined phase of Improved Holographic QCD, a refined holographic model for large-N (c) YM theory. Our result for Γ(CS)/(sT ), where s is entropy density and T is temperature, varies slowly at high T and increases monotonically as T approaches the transition temperature from above. We also study the retarded two-point function of tr [F ∧ F ] with non-zero frequency and momentum. Our results suggest that the CP-odd phenomena that may potentially occur in heavy ion collisions could be controlled by an excitation with energy on the order of the lightest axial glueball mass.

Dates and versions

in2p3-00826113 , version 1 (26-05-2013)

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U. Gürsoy, I. Iatrakis, E. Kiritsis, F. Nitti, A. Obannon. The Chern-Simons Diffusion Rate in Improved Holographic QCD. Journal of High Energy Physics, 2013, 2013, pp.119. ⟨10.1007/JHEP02(2013)119⟩. ⟨in2p3-00826113⟩
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