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Gauge/gravity duality and thermalization of a boost-invariant perfect fluid

Romuald A. Janik·Robi Peschanski
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Abstract

We derive the equation for the quasi-normal modes corresponding to the scalar excitation of a black hole moving away in the fifth dimension. This geometry is the AdS/CFT dual of a boost-invariant expanding perfect fluid in N=4 SUSY Yang-Mills theory at large proper-time. On the gauge-theory side, the dominant solution of the equation describes the decay back to equilibrium of a scalar excitation of the perfect fluid. Its characteristic proper-time can be interpreted as a thermalization time of the perfect fluid, which is a universal (and numerically small) constant in units of the unique scale of the problem. This may provide a new insight on the short thermalization-time puzzle encountered in heavy-ion collision phenomenology. A nontrivial scaling behaviour in proper-time is obtained which can be interpreted in terms of a slowly varying adiabatic approximation.

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Romuald A. Janik, Robi Peschanski. 2006-07-11. Gauge/gravity duality and thermalization of a boost-invariant perfect fluid. https://doi.org/10.1103/physrevd.74.046007

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