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I will talk about two aspects of holography. The first part concerns the late-time dynamics of AdS black branes. I will explain why the usual picture of black hole ringdown as a linear superposition of quasinormal modes is incomplete. Due to the interplay between nonlinear effects and horizon dissipation, higher Fourier sectors at late times are dominated by harmonics driven by the fundamental mode. These harmonics exhibit a universal cascade relation, which can be derived from relativistic viscous fluid dynamics. This identifies an attractor solution governing the late-time relaxation of nonlinear dissipative systems.
The second part focuses on holography on non-manifold spacetimes. I will describe how such geometries can realize GHZ-type quantum states and provide another route for counting black hole microstates. I will also briefly discuss the properties of field theories defined on these non-manifold spaces, namely holographic junctions.
Biography：
Yan Liu did his undergraduate studies at USTC (2001-2005). After completing his Ph.D. at ITP, CAS in 2010, he conducted postdoctoral research at the Lorentz insitutute, Leiden University (2010-2013) and later at IFT-UAM/CSIC in Spain (2013-2016). In 2016, he joined Beihang University as a professor. His research focuses on holographic duality, black hole physics, and quantum gravity.
Shanming Ruan