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Cosmological standard timers in measuring the Universe
10/20
2022
Seminar
- Title Cosmological standard timers in measuring the Universe
- Speaker Qian-Hang Ding（HKUST）
- Date 10:30 Oct. 20, 2022
- Venue 6420,ITP South Building Join Zoom Meeting https://zoom.us/j/83908412509?pwd=OHhTWWFmRlZrZWtkRUFjZFZqNEkxdz09 Meeting ID: 839 0841 2509 Passcode: 622741
Abstract
We propose a formalism of standard timers in tracking the evolution of the Universe. By studying the evolution of the dynamic systems in the Universe, their physical evolution time can be extracted. Meanwhile, their observational signals encode the cosmological redshift. Accordingly the redshift-time relation can be obtained from the observable of the cosmological dynamic systems, which helps the understanding the evolution of the Universe. In a practical description of the cosmological standard timer, we use the Hawking radiation from the Primordial Black Holes (PBHs) clustering and the gravitational waves from PBH binaries as the examples to show how to extract the redshift-time relation from the observables, which also shows the great potential of standard timers in measuring the Universe.
Contact Wang Shaojiang