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<p>We revisit the computation of the shear viscosity to entropy ratio <i>η</i>/<i>s</i> at finite chemical potential in a holographic model that takes into account the quantum fluctuations in the IR region of near-extremal black branes. Such quantum corrections can be computed from JT gravity and generate non-trivial temperature dependence for <i>η</i>/<i>s</i>, which deviates from the universal 1/4<i>π</i> result. In the semi-classical regime, <i>η</i>/<i>s</i> attains a minimum which is below the KSS bound, generated by the presence of the quantum effects. In the quantum regime at lower temperatures, <i>η</i>/<i>s</i> increases and is well above the KSS bound. We also compare the shear viscosity to the quantum-corrected absorption cross-section of near-extremal black holes, and find agreement.</p>

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Quantum corrections to η/s from JT gravity

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月18日

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  • Sera Cremonini,
  • Li Li,
  • Xiao-Long Liu,
  • Jun Nian

摘要

We revisit the computation of the shear viscosity to entropy ratio η/s at finite chemical potential in a holographic model that takes into account the quantum fluctuations in the IR region of near-extremal black branes. Such quantum corrections can be computed from JT gravity and generate non-trivial temperature dependence for η/s, which deviates from the universal 1/4π result. In the semi-classical regime, η/s attains a minimum which is below the KSS bound, generated by the presence of the quantum effects. In the quantum regime at lower temperatures, η/s increases and is well above the KSS bound. We also compare the shear viscosity to the quantum-corrected absorption cross-section of near-extremal black holes, and find agreement.