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Temporal evolution of a comoving qubit coupled to a scalar field in de Sitterspace is studied with an emphasis on reliable extraction of late-timebehaviour. The phenomenon of critical slowing down is observed if the effectivemass is chosen to be sufficiently close to zero, which narrows the window ofparameter space in which the Markovian approximation is valid. The dynamics ofthe system in this case are solved in a more general setting by accounting fornon-Markovian effects in the evolution of the qubit state. Self-interactionsfor the scalar field are also incorporated, and reveal a breakdown of late-timeperturbative predictions due to the presence of secular growth.

Hot Cosmic Qubits: Late-Time de Sitter Evolution and Critical Slowing Down