Universality of Dissipation across Holographic Interfaces

Andreas Karch; Mianqi Wang

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arXiv · 2601.16888

Universality of Dissipation across Holographic Interfaces

Andreas Karch·Mianqi Wang

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Abstract

Motivated by recent results in spin chains we study dissipation and relaxation in a two-dimensional \ak{holographic} interface conformal field theory (ICFT) in which degrees of freedom on one side of the interface are coupled to an external bath, while the other side remains isolated. In the bulk description this setup is realized by gluing a supersymmetric Janus geometry to a BTZ black hole region, with the coupling implemented through a double-trace deformation. We determine the quasinormal modes in the bulk by solving the double-trace matching conditions of the system and bath. Focusing on the fixed AdS$_2$ descendant channel at large frequency, we introduce the dimensionless ratio $c_{UV}$ as a projected measure of interface-induced suppression of dissipation rate. Analytically we find that in this limit, $c_{UV}$ is independent of coupling details to the bath. It is a strong candidate for a universal interface observable characterizing dissipation and relaxation across the interface, in additional to the $c_{\rm relax}$ raised in earlier work for lattice models.

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Andreas Karch, Mianqi Wang. 2026-09-05. Universality of Dissipation across Holographic Interfaces. https://arxiv.org/abs/2601.16888

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