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The evolution of planets, stars and even galaxies is driven, to a largeextent, by dynamical friction of gravitational origin. There is now a goodunderstanding of the friction produced by extended media, either collisionlessof fluid-like. However, the physics of accretion or protoplanetary disks, forinstance, is described by slab-like geometries instead, compact in one spatialdirection. Here, we find, for the first time, the gravitational wake due to amassive perturber moving through a slab-like medium, describing e.g. accretiondisks with sharp transitions. We show that dynamical friction in suchenvironments can be substantially reduced relatively to spatially extendedprofiles. Finally, we provide simple and accurate expressions for thegravitational drag force felt by the perturber, in both the subsonic andsupersonic regime.

Dynamical friction in slab geometries and accretion disks