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Langevin diffusion of heavy quarks in non-conformal holographic backgrounds

By U. Gursoy, E. Kiritsis, L. Mazzanti and F. Nitti


73 pages, 13 figuresInternational audienceThe Langevin diffusion process of a relativistic heavy quark in a non-conformal holographic setup is discussed. The bulk geometry is a general, five-dimensional asymptotically AdS black hole. The heavy quark is described by a trailing string attached to a flavor brane, moving at constant velocity. From the equations describing linearized fluctuations of the string world-sheet, the correlation functions defining a generalized Langevin process are constructed via the AdS/CFT prescription. In the local limit, analytic expressions for the Langevin diffusion and friction coefficients are obtained in terms of the bulk string metric. Modified Einstein relations between these quantities are also derived. The spectral densities associated to the Langevin correlators are analyzed, and simple analytic expressions are obtained in the small and large frequency limits. Finally, a numerical analysis of the jet-quenching parameter, and a comparison to RHIC phenomenology are performed in the case of Improved Holographic QCD

Topics: [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
Publisher: 'Springer Science and Business Media LLC'
Year: 2010
DOI identifier: 10.1007/JHEP12(2010)088
OAI identifier: oai:HAL:hal-00713167v1
Provided by: HAL-CEA
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