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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.
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Contributor : E. Kiritsis <>
Submitted on : Sunday, May 26, 2013 - 8:23:03 PM
Last modification on : Saturday, September 19, 2020 - 4:48:59 AM

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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, Springer, 2013, 2013, pp.119. ⟨10.1007/JHEP02(2013)119⟩. ⟨in2p3-00826113⟩



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