arXiv subjects

M. Navid Gasemi Zad

Publications and source records attributed to M. Navid Gasemi Zad.

2 recordsLinked to original sources

arXiv2026

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 (DM) halo and study scalarization induced by DM. We derive the required conditions on the scalar DM 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 DM phenomenology and scalarization around a black hole.

gr-qc↗

arXiv2026

Spontaneous scalarization around a black hole in a dark matter halo

We demonstrate that in a scalar-tensor theory where dark matter is conformally coupled to a scalar field, a black hole surrounded by a Hernquist dark matter halo can undergo spontaneous scalarization, acquiring a nontrivial scalar field configuration. The astrophysical properties of the dark matter halo directly dictate the quantum-like spectrum of scalar field configurations around the central black hole. Remarkably, the conformal coupling constant becomes discretized and is determined solely by the halo's compactness parameter.

gr-qc↗