We study quantum corrections at one-loop order to the shear viscosity to entropy ratio by implementing the Vilkovisky-Barvinsky effective action in asymptotically Anti-de Sitter spacetimes. The shear viscosity is shown to receive no corrections at this order, but the entropy acquires a logarithmic correction. The coefficient of this logarithm turns out to depend on the spin of the particles running in the loop and it can be either positive or negative. On the basis of this result, we argue that the Kovtun–Son–Starinets bound cannot be seen as a fundamental property of nature beyond the classical regime.

中文翻译：

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对AdS ₄ / CFT _3中的η / s进行单环校正

我们通过在渐近的反德西特时空中实现Vilkovisky-Barvinsky有效作用，研究对剪切粘度与熵之比的一环级量子校正。剪切粘度显示为不按此顺序进行校正，但是熵获得对数校正。该对数的系数取决于循环中运行的粒子的自旋，它可以是正数或负数。根据这一结果，我们认为，科夫屯-儿子-Starinets界不能被视为超越古典政权的自然的基本属性。