科学研究
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2025.04.17
Wave dark matter
We will discuss the possibility that dark matter is composed of sufficiently light particles (such as axions) that it effectively behaves as a collection of waves. We will review the particle physics motivations and the rich wave phenomenology, and discuss the implications for astronomical observations and experimental detection.BIOHui Lam got his PhD from Massachusetts Institute of Technology....
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2025.04.16
基于宇宙微波背景与射电观测的宇宙学研究
通过联合宇宙微波背景和射电波段的观测可以揭示宇宙从早期到晚期不同阶段的演化历史。未来对宇宙微波背景偏振信号的高精度测量，将有助于探测由主要扰动及次级效应产生的新偏振信号，为早期宇宙物理机制及大尺度结构的形成与演化提供重要观测依据。同时，中性氢21厘米线信号可在不同红移和空间尺度上追踪暗物质主导的大尺度结构，为暗物质和暗能量的研究提供重要线索。宇宙微波背景与21厘米线信号在时间和空间尺度上的互补性，...
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2025.04.10
拉索发现黑洞是PeV宇宙线加速器
拉索在银河系内发现了许多“拍电子伏加速器(PaVetron)”，其中的一部分以第一个黑洞PaVetron源表的形式发表，清楚显示出一个新的宇宙线源的“类”。最引人瞩目的是存在一个“超级-PaVetron”。还发现了一个近乎完美的黑洞+喷流的系统，让人类能够细致的研究黑洞吸积盘、喷流的产生等基本的物理问题。更重要的是我们发现，大约10个左右的源，将足以提供宇宙线“膝”及其以上的宇宙线的流量。拉索刚刚发表了质子在膝附近的能谱，...
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2025.04.03
Exploring the dark sector with gravitational lensing and wide field surveys in imaging and spectroscopy [EN]
Since the discovery of the accelerated expansion of the universe in the 2000, dark matter and dark energy have been the main drivers of research in observational cosmology. At the same time, gravitational lensing, boosted by the Hubble Space Telescope observations, has become a key probe of the dark sector. In this talk, I will review this topic and focus on my research in Euclid and in DESI. I...
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2025.03.28
Design, Testing, and Commissioning of the Sun Yat-sen University 80 cm Infrared Telescope [EN]
The Sun Yat-sen University (SYSU) 80cm infrared telescope is designed for near-infrared time-domain observations. It’s primary scientific objectives include follow-up of transients such as supernovae, gamma-ray burst afterglows, tidal disruption events, and monitoring of brown dwarfs, AGNs and variable stars. The telescope has an 80cm diameter with f/8, and is capable of observing in J and K b...
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