An elastic Klein-Gordon string in a run-and-tumble active bath develops negative total friction from a dominant frenetic term at sufficient persistence, triggering wave instability akin to inverse Landau damping, derived exactly in weak coupling and backed by simulations.
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Coupling an elastic string to an active bath: the emergence of inverse damping
An elastic Klein-Gordon string in a run-and-tumble active bath develops negative total friction from a dominant frenetic term at sufficient persistence, triggering wave instability akin to inverse Landau damping, derived exactly in weak coupling and backed by simulations.