For small polytropic galaxies with a central point mass, the gravitational force from linear perturbations decays as (1+t)^{-b}, with decay order set by initial-data and steady-state regularity.
Y., On algebraic damping close to inhomogeneous Vlasov equilibria in multi- dimensional spaces
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On quantitative linear gravitational relaxation
For small polytropic galaxies with a central point mass, the gravitational force from linear perturbations decays as (1+t)^{-b}, with decay order set by initial-data and steady-state regularity.