希腊帕特雷大学Dimitrios Zoakos团队研究了轴子全息二维各向异性流体的热力学和直流电导率。该项研究成果发表在2025年4月1日出版的《高能物理杂志》上。

课题组研究了2+1维中与渐近AdS黑膜对偶的强耦合有限密度各向异性流体，该膜是3+1维中爱因斯坦-麦克斯韦公理理论的解。尽管存在各向异性，但流体热力学性质与共形流体的热力学性质一致。此外，研究组证明了流体在各向异性参数增加的情况下是稳定的。

此外，他们还分析了各向异性流体的直流电导率，表明其与平移对称性破坏引起的动量耗散相容。在非常大的各向异性的极限下，研究组发现直流电导率由于维数降低而消失。他们还发现，金属-绝缘体转变是由各向异性驱动的。

附：英文原文

Title: Thermodynamics and DC conductivity of 2D anisotropic fluids from axion holography

Author: Ballon-Bayona, Alfonso, Shock, Jonathan P., Zoakos, Dimitrios

Issue&Volume: 2025-04-01

Abstract: We investigate a strongly coupled finite-density anisotropic fluid in 2 + 1 dimensions dual to an asymptotically AdS black brane that is a solution of Einstein-Maxwell-Axion theory in 3 + 1 dimensions. Despite the anisotropy, the fluid thermodynamic properties align with those of a conformal fluid. Moreover, we show that the fluid is stable under the increase of the anisotropy parameter. Additionally, we analyse the DC conductivity of the anisotropic fluid, showing its compatibility with momentum dissipation due to translational symmetry breaking. In the limit of very large anisotropy we find that the DC conductivity vanishes as a consequence of dimensionality reduction. We also find that a metal-insulator transition arises driven by the anisotropy.

DOI: 10.1007/JHEP04(2025)002

Source: https://link.springer.com/article/10.1007/JHEP04(2025)002