Abstract
We study holographic isotropisation of homogeneous, strongly coupled, non-Abelian plasmas in Gauss-Bonnet gravity with a negative cosmological constant. We focus on small values of the Gauss-Bonnet coupling parameter λ GB and linearise the equations of motion around a time-dependent background solution with λ GB = 0. We numerically solve the linearised equations and show that the entire time evolution of the pressure anisotropy can be well approximated by the linear in λ GB corrections to the quasinormal mode expansion, even in the cases of high anisotropy. We finally show that, quite generally, the time evolution of the pressure anisotropy with the Gauss-Bonnet term is approximately shifted with respect to the evolution without it, with the sign of the shift being directly related to the sign of the λ GB parameter. Combined with the observation that negative λ GB captures qualitative features of positive gauge coupling corrections, this suggests that the latter generically increase the isotropisation time of strongly coupled plasmas.
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Andrade, T., Casalderrey-Solana, J. & Ficnar, A. Holographic isotropisation in Gauss-Bonnet gravity. J. High Energ. Phys. 2017, 16 (2017). https://doi.org/10.1007/JHEP02(2017)016
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DOI: https://doi.org/10.1007/JHEP02(2017)016