The Physics Colloquium has been arranged regularly since the fall semester of 2021. The detailed schedule and talk information of this semester are as follows.
For inquiries or suggestions of future speakers, please contact the colloquium working group (Prof. Jane Lixin Dai, Prof. Tran Trung Luu, Prof. Yanjun Tu, Prof. Chenjie Wang, and Prof. Shizhong Zhang).
Wave Dark Matter
Speaker: Prof. Lam HUI
Affiliation: Columbia University
Date: September 11, 2024 (Wednesday)
Time: 5:00 p.m.
Venue: MWT4, 1/F, Meng Wah Complex, Main Campus, HKU, The University of Hong Kong
Poster: Download
Abstract:
In this colloquium, Prof. Hui will discuss the possibility that dark matter is composed of sufficiently light particles that it effectively behaves as a collection of waves. He will review the particle physics motivations and the rich wave phenomenology, and discuss the implications for astronomical observations and experimental detection.
Key Reference:
Explore the Time Frontier: from Galileo to Cosmic Antennae
Speaker: Prof. Di LI
Affiliation: Tsinghua University and National Astronomical Observatories of China
Date: September 25, 2024 (Wednesday)
Time: 5:00 p.m.
Venue: MWT4, 1/F, Meng Wah Complex, Main Campus, HKU, The University of Hong Kong
Poster: Download
Abstract: 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. We 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, we 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, we invented the Pincus-Lyapunov 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, we 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.
Key Reference:
- https://ui.adsabs.harvard.edu/abs/2018IMMag..19..112L/abstract
- https://ui.adsabs.harvard.edu/abs/2022Natur.601...49C/abstract
- https://ui.adsabs.harvard.edu/abs/2021Natur.598..267L/abstract
- https://ui.adsabs.harvard.edu/abs/2024SciBu..69.1020Z/abstract
Topic to be announced
Speaker: Prof. Jianglai LIU
Affiliation: Shanghai Jiaotong University
Date: October 23, 2024 (Wednesday)
Time: 5:00 p.m.
Venue: MWT4, 1/F, Meng Wah Complex, Main Campus, HKU, The University of Hong Kong
Poster: TBC
Abstract: TBC
Key Reference: TBC
TBC
Speaker: TBC
Affiliation: TBC
Date: November 20, 2024 (Wednesday)
Time: 5:00 p.m.
Venue: MWT4, 1/F, Meng Wah Complex, Main Campus, HKU, The University of Hong Kong
Poster: TBC
Abstract: TBC
Key Reference: TBC
TBC
Speaker: TBC
Affiliation: TBC
Date: December 4, 2024 (Wednesday)
Time: 5:00 p.m.
Venue: CYCP1, LG1/F, Chong Yuet Ming Physics Building, Main Campus, The University of Hong Kong
Poster: TBC
Abstract: TBC
Key Reference: TBC