Fall 2024 Physics Colloquium:- Explore the Time Frontier- from Galileo to Cosmic Antennae
Human’s perception and philosophy of the cosmos depend on our collective sensors. Modern optical sky surveys in the 20th century gave rise to the concept of dynamic Universe, the forefront of which currently is situated in radio bands and manifests itself as Fast Radio Bursts(FRB). FRB researches have been awarded the 2023 Shaw prize and the 2024 Marcel Grossman Award. China built the largest radio telescope, namely, the Five-hundred-meter Aperture Spherical radio Telescope(FAST), which has been leading the field of characterizing repeating FRBs ever since the its inception in 2020. With close to 100 FAST-based papers on FRBs, including 5 on Nature and 2 on Science, the speaker and his team started to establish an evolutionary picture for FRBs. With compact objects being the leading candidate engine of FRBs, the utter lack of short-time-scale periodicity present a major mystery regarding FRBs’ origin. Recently, they invented the Pincus-Lyapunov(P-L) diagram to help ascertain the stochastic nature of FRBs. The P-L diagram quantify FRBs to be less chaotic than Earthquakes, but way more random, akin to a Brownian motion on the energy-time bi-variate space. This stochastic behavior presumably reflects the young ages of FRBs. To help systematically localize and discover multi-band counterparts, they are building a next generation FRB machine, namely Cosmic Antennae(CA), the aim of which is to increase the discovery rate by orders of magnitude over all current radio telescopes.
時間：2024.09.25(三) 17:00
地點：香港大學 本部校園 明華綜合大樓* MWT4 1/F
講者：Prof. LI Di 李菂 教授 (中国北京清华大学 及 中国科学院国家天文台)
語言：英語
免費會議，歡迎參加
【此屬轉載信息，以主事單位發布為準】
*MWT4, 1/F, Meng Wah Complex, Main Campus, HKU
** Tsinghua University and National Astronomical Observatories of China
此活動由香港大學物理系主辦。
