IAS Program on Particle Theory:- Survival of the Fittest- Testing Superradiance Termination with Simulated Binary Black Hole Statistics
The superradiance instability of rotating black holes leads to the formation of an ultralight boson cloud with distinctive observational signatures, making black holes an effective probe of ultralight dark matter. However, around black holes in a binary system, the superradiance effect of such clouds can be terminated by tidal perturbations from the companion, leading to cloud depletion. In this study, the speaker and her tem perform the first analysis of the impact of this termination effect on superradiant black hole binaries which are realistically modelled after their statistics in our Galaxy. Working with a dataset of approximately 10⁷ black hole binaries simulated using the Stellar EVolution for N-body(SEVN) population synthesis code, they identify the superradiant candidates and those that manage to survive the termination effect. They then calculate the cloud survival rate for various boson masses and black hole spin models. Their findings reveal that the l = m = 1 cloud modes are generally stable against termination, whereas the l = m = 2 modes can be significantly affected, with survival rates dropping below 10% for boson masses below approximately 0.5 × 10⁻¹² eV. In addition, their analysis indicates that clouds that overcome termination typically exhibit a higher superradiant growth rate and therefore a higher detectability.
時間：2025.01.02(三) 14:00~15:00
地點：香港科技大學 李兆基校園 盧家驄薈萃樓* 高研院4042室
講者：Dr. ZHU Hui-Yu 朱慧宇 博士 (韓國 基礎科學硏究院**)
語言：英語
免費講座。座位先到先得
【此屬轉載信息，以主事單位發布為準】
*Lo Ka Chung Building, Lee Shau Kee Campus
**Institute for Basic Science(IBS), South Korea 기초과학연구원
此活動由香港科技大學 賽馬會高等研究院主辦。
