  Hydrodynamics is a universal effective theory describing relaxation of
quantum field theories towards equilibrium. Massive QFTs in de Sitter spacetime
are never at equilibrium. We use holographic gauge theory/gravity
correspondence to describe relaxation of a QFT to its Bunch-Davies vacuum - an
attractor of its late-time dynamics. Specifically, we compute the analogue of
the quasinormal modes describing the relaxation of a holographic toy model QFT
in de Sitter.
