Bounds on ultralight bosons from the Event Horizon Telescope observation of Sgr A$^*$

Understand

Recent observation of Sagittarius A$^*$ (Sgr A$^*$) by the Event Horizon Telescope (EHT) collaboration has uncovered various unanswered questions in black hole (BH) physics.

• Besides, it may also probe various beyond the Standard Model (BSM) scenarios.
• One of the most profound possibilities is the search for ultralight bosons (ULBs) using BH superradiance (SR).
• EHT observations imply that Sgr A$^*$ has a non-zero spin.