Research
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2025.04.24
Active galactic nuclei and mergers in IR-bright galaxies
The interaction of galaxies is known to regulate the star-formation activities in the merging systems, or galaxy pairs, however, whether and how such interactions affect the central supermassive black hole, often manifested as active galactic nuclei---AGNs, is still under debate. Controversies exist as to whether AGN activities are enhanced or suppressed during the different merging phases. The...
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2025.04.22
Shedding light on the particle nature of dark matter
Several astrophysical and cosmological phenomena are consistent with the existence of a non-luminous, non-interacting “Dark Matter.” In this talk I describe efforts to detect Cold Dark Matter with particle experiments and the current limits. I then give an overview of the astrophysical constraints on Warm, Self-Interacting, and Fuzzy Dark Matter and a future outlook on Dark Matter searches.BI...
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2025.04.21
Clustering analysis on 4MOST Cosmology Redshift survey
This presentation is divided into three main parts:Overview of Large-Scale Structure (LSS) Studies in CosmologyThis section introduces the theoretical framework behind the formation and evolution of large-scale structure, observations on LSS, statistical techniques used for LSS data analysis, and key phenomena (BAO, RSD and AP effect) associated with LSS.Introduction to 4MOST and the Cosmologic...
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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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