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In this paper we construct particular solutions to the classicalVlasov-Poisson system near stable Penrose initial data on $\mathbb{T} \times\mathbb{R}$ that are a combination of elementary waves with arbitrarily highfrequencies. These waves mutually interact giving birth, eventually, to aninfinite cascade of echoes of smaller and smaller amplitude. The echo solutionsdo not belong to the analytic or Gevrey classes studied by Mouhot and Villani,but do, nonetheless, exhibit damping phenomena for large times.

Plasma echoes near stable Penrose data