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arXiv 1003.3636hep-thgr-qc
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黑膜粘度与Gregory-Laflamme不稳定性

Black Brane Viscosity and the Gregory-Laflamme Instability

Joan Camps, Roberto Emparan, Nidal Haddad

摘要:

我们研究了长波长扰动的中性黑p-膜在渐近平坦的空间,并表明,预期在blackfold方法,解决方案的相对论流体动力学方程的有效p+1维流体产生解决方案的真空爱因斯坦方程的导数展开。超越完美流体近似,我们计算的有效剪切和体积粘度的黑膜。我们得到的值饱和一般的界限。有效流体中的声波是不稳定的,并且先前已经与黑p膜的格雷戈里-拉弗拉姆不稳定性相关。通过在不稳定的声波中考虑粘性的阻尼效应,我们得到了一个非常好的和简单的近似的Gregory-Laflamme模式的色散关系,其精度随着横向维数的增加而增加。当维数趋于无穷大时,我们提出了一个精确的极限形式。

英文摘要:

We study long wavelength perturbations of neutral black p-branes in asymptotically flat space and show that, as anticipated in the blackfold approach, solutions of the relativistic hydrodynamic equations for an effective p+1-dimensional fluid yield solutions to the vacuum Einstein equations in a derivative expansion. Going beyond the perfect fluid approximation, we compute the effective shear and bulk viscosities of the black brane. The values we obtain saturate generic bounds. Sound waves in the effective fluid are unstable, and have been previously related to the Gregory-Laflamme instability of black p-branes. By including the damping effect of the viscosity in the unstable sound waves, we obtain a remarkably good and simple approximation to the dispersion relation of the Gregory-Laflamme modes, whose accuracy increases with the number of transverse dimensions. We propose an exact limiting form as the number of dimensions tends to infinity.

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