Black Hole Hair from Scalar Dark Matter

by Suruj Jyoti Das

Thursday 27 Mar 2025, 15:00 → 16:00 Asia/Seoul

CTPU seminar room (IBS)

The classical no‐hair theorems tell us that, under standard assumptions, black holes (BH) cannot support nontrivial scalar “hair”. However, Jacobson earlier noted (arXiv: 9905303) that even with a minimally coupled scalar, i.e. staying within GR,  a BH can acquire scalar hair if the scalar field is time-dependent far from the BH. I will review the paper arXiv: 1904.12803 , where the authors systematically explore the scalar profile around the black hole for different scalar (dark matter) masses. While producing the 1/r profile in the small mass limit, consistent with Jacobson's result, the scalar field has a 1/r^{3/4} profile yielding a pile-up close to the horizon, while distinctive nodes occur for intermediate masses.

Related reference: arXiv:1904.12783