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Internal Space Superradiance
05/10
2023
Seminar
- Title Internal Space Superradiance
- Speaker Shuang-Yong Zhou (USTC)
- Date 14:00 May 10, 2023
- Venue 6620, ITP South Building
Abstract
Superradiance, coined by Dicke originally for emission enhancement in a coherent medium, is a collection of phenomena where radiation is amplified during a physical process. Black hole superradiance has been extensively studied, thanks to its relevance to gravitational theories, astrophysics and particle physics. In this talk, I will show that Q-balls and boson stars can also superradiate. Q-balls are non-topological solitons which are rotating in the internal space, first proposed by T.D. Lee et al. They are dark matter candidates and may also play other roles in particle physics and cosmology. We show that Q-balls, although stable in isolation, can superradiantly enhance radiation impinging on them. We show that Q-ball superradiance is due to a new mechanism involving interplay of multiple modes and coherent rotation in internal field space. The same mechanism also works for boson stars, another candidate for dark matter of the astronomical sizes.
Invitor:
Shi Pi