Black holes, particularly after merging, exhibit “ringing” or quasinormal mode echoes – vibrations that decay over time.

The decay rate is also governed by the same constants and thought to represent the fastest possible relaxation time allowed by Quantum Mechanics.

The echoes in black holes and the sluggish, viscous conductivity in strange metals both reflect a deeply entangled quantum state – one where information spreads rapidly and irreversibly.

In both cases, the system’s response to perturbations is dictated not by Classical Mechanics, but by universal quantum bounds.

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