Holographic isotropisation in Gauss-Bonnet gravity

DOI10.1007/JHEP02(2017)016zbMATH Open1377.83070arXiv1610.08987OpenAlexW2546081160MaRDI QIDQ1692767

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Publication date: 10 January 2018

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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 $lambd{a}_{GB}$ and linearise the equations of motion around a time-dependent background solution with $lambd{a}_{GB}=0$. 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 $lambd{a}_{GB}$ 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 {it shifted} with respect to the evolution without it, with the sign of the shift being directly related to the sign of the $lambd{a}_{GB}$ parameter. This suggests that finite coupling corrections generically {it increase} the isotropisation time of strongly coupled plasmas.

Full work available at URL: https://arxiv.org/abs/1610.08987

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