Constraining Self-interacting Scalar Field Dark Matter From the Black Hole Shadow of the Event Horizon Telescope

Understand

An exciting possibility to constrain dark matter (DM) scenarios is to search for their gravitational imprints on Black Hole (BH) observations.

• In this paper, we investigate the impact of self-interacting scalar field DM on the shadow radius of a Schwarzschild BH.
• We implement a self-consistent formulation, paying attention to the enhancement of the DM density due to the BH gravitational influence and the accretion flow onto the BH.
• First, we calculate the first-order correction to the shadow radius caused by a general DM environment.