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We study string theory duals of the expanding boost invariant conformal gaugetheory plasmas at strong coupling. The dual supergravity background isconstructed as an asymptotic late-time expansion, corresponding toequilibration of the gauge theory plasma. The absence of curvaturesingularities in the first few orders of the late-time expansion of the dualgravitational background unambiguously determines the equilibrium equation ofthe state, and the shear viscosity of the gauge theory plasma. While theabsence of the leading pole singularities in the gravitational curvatureinvariants at the third order in late-time expansion determines the relaxationtime of the plasma, the subleading logarithmic singularity can not be canceledwithin a supergravity approximation. We comment on the possible interpretationsof this singularity.

On SUGRA description of boost-invariant conformal plasma at strong coupling