Mass-Varying Dark Matter Induced Scalarization and Scalar Clouds around Black Holes

We consider a black hole solution embedded in a mass varying dark matter halo and study scalarization induced by dark matter. We derive the required conditions on the scalar dark matter coupling that allow for a regular bound state scalar cloud. We find that such configurations exist only for quantized coupling values in terms of the halo’s intrinsic parameters (for Hernquist, this reduces to the inverse of the compactness). This study provides a novel connection between dark matter phenomenology and scalarization around a black hole.