Gravitational focusing of Imperfect Dark Matter

Understand

Motivated by the projectable Horava--Lifshitz model/mimetic matter scenario, we consider a particular modification of standard gravity, which manifests as an imperfect low pressure fluid.

• While practically indistinguishable from a collection of non-relativistic weakly interacting particles on cosmological scales, it leaves drastically different signatures in the Solar system.
• The main effect stems from gravitational focusing of the flow of Imperfect Dark Matter passing near the Sun.
• This entails strong amplification of Imperfect Dark Matter energy density compared to its average value in the surrounding halo.