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Fluctuations of the initial color fields in high energy heavy ion collisions

Abstract : In the Color Glass Condensate approach to the description of high energy heavy ion collisions, one needs to superimpose small random Gaussian distributed fluctuations to the classical background field, in order to resum the leading secular terms that result from the Weibel instability, that would otherwise lead to pathological results beyond leading order. In practical numerical simulations, one needs to know this spectrum of fluctuations at a proper time $\tau \ll Q_s^{-1}$ shortly after the collision, in the Fock-Schwinger gauge $A^\tau=0$. In this paper, we derive these fluctuations from first principles, by solving the Yang-Mills equations linearized around the classical background, with plane wave initial conditions in the remote past. We perform the intermediate steps in light-cone gauge, and we convert the results to the Fock-Schwinger gauge at the end. We obtain simple and explicit formulas for the fluctuation modes.
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Contributor : Emmanuelle De Laborderie Connect in order to contact the contributor
Submitted on : Wednesday, June 11, 2014 - 3:27:19 PM
Last modification on : Monday, December 13, 2021 - 9:16:03 AM

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  • HAL Id : cea-01004666, version 1
  • ARXIV : 1307.1765



Thomas Epelbaum, François Gelis. Fluctuations of the initial color fields in high energy heavy ion collisions. 2013. ⟨cea-01004666⟩



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