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2025.10.17
3D magnetic fields in the interstellar medium
Magnetic fields in the interstellar medium (ISM) play a fundamental role in regulating star formation, guiding cosmic rays transport and acceleration, and shaping the Galactic foregrounds that limit precision in cosmology. Yet their 3D structure has remained elusive: most traditional methods measure only partial 2D information. In this talk, I will present new progress toward directly recoverin...
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2025.10.22
Let COLIBRE Be Light: Luminosity Functions of the New State-of-the-Art COLIBRE Simulation
COLIBRE is a new set of state-of-the-art cosmological hydrodynamical simulations of galaxy formation that self-consistently model the cold interstellar medium (ISM) and the dust therein. Previous large-volume simulations are often calibrated against low-redshift observational constraints, particularly the stellar mass function (SMF), which relies on a number of uncertain assumptions such as sta...
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2025.10.11
Cosmology with galaxy surveys: from cosmic shear to 6x2pt
In 2000, cosmic shear, namely the gravitational lensing effect generated by the large-scale structure, was first measured by photometric galaxy surveys. Since then, it has been playing an increasingly important role in modern cosmology, providing tight constraints on the matter density parameter (Omega_m) and fluctuation amplitude parameter (S8). With the improvement in image quality, sky cover...
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2025.09.24
Full-shape Galaxy Clustering Analysis in the Era of Precision Cosmology: Lessons from DESI DR1 and Beyond
The Dark Energy Spectroscopic Instrument (DESI) enables precision cosmology by mapping the large-scale distribution of galaxies with unprecedented detail. A central component of this effort is the full-shape analysis of galaxy clustering, which extracts information beyond the baryon acoustic oscillation (BAO) feature. In this talk, I will present the main scientific results from the DESI DR1 fu...
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2025.09.17
Constraining halo properties of low-mass galaxies with large imaging and spectroscopic surveys
Dwarf galaxies serve as powerful probes of both the nature of dark matter and the effects of baryonic processes. Over the past two decades, observations of nearby dwarf galaxies have revealed tensions with predictions from simulations based on the standard ΛCDM cosmology. In this talk, I will present the Merian Survey, a medium-band imaging survey conducted with the Dark Energy Camera (DECam),...
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2025.09.11
Cosmic Dawn as a portal to New Physics
In this talk, I will summarize growing observational evidence from JWST that suggests accelerated structure formation in the early universe. Some are challenging canonical galaxy formation models in the standard LambdaCDM cosmology. I will begin by briefly reviewing potential resolutions to these tensions within the standard cosmological framework. Then I will focus on two extensions beyond the...
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2025.09.11
脉冲星自转减慢和高速中子星中子超流 ―涡旋体的中微子辐射及其效应
1）1982年我们把凝聚态物理学和粒子物理学相结合提出了中子星内中子超流涡旋运动发出的中微子回旋辐射作为长周期脉冲星自转减慢的一种新的可能机制。 2）我们利用中微子火箭喷流模型可以合理地解释天文观测发现的高匝速中子星现象。Host: Xinyu L
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2025.12.25
从高能暂现源的观测、研究到应用
近年来，多个历史性多波段成协事件的观测为高能暂现源的研究提供了重要突破。例如，GRB 170817A与引力波信号的成协，不仅证实了双致密星并合事件，还为引力波天文学的发展奠定了基础。XRB 200428与快速射电暴的成协揭示了磁星是部分FRB的起源。这些重要事件的成协证认及后续的数据分析和科学研究，首先依赖于对其准确定位，因此我们提出了改进的多卫星联合定位方法。我们还对这些爆发进行了准周期、谱延迟、最小光变时标、引力...
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2025.12.18
Coronagraphs: From Proving Einstein to Imaging Exoplanetary/Extragalactic Systems
Thirty years after the discovery of an exoplanet orbiting a Sun-like star, we have confirmed over 6,000 exoplanets. However, the existence of a Solar System analog – let alone an exo-Earth – remains elusive. This gap in our knowledge reflects not the uniqueness of our home, but the technical challenge of directly detecting habitable worlds around Sun-like stars. High-contrast imaging, enabled...
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2025.12.11
动力学暗能量与原初引力波探测新进展
本报告将介绍国际暗能量研究的最新进展，介绍暗能量理论模型，特别是描述状态方程越过 宇宙学常数线的Quintom 理论的发展历史和研究现状; 介绍我国阿里原初引力波探测实验（AliCPT）的现状和下一步规划及预期科学目标; 介绍AliCPT 探测暗能量动力学机制的可能性。报告人简介张新民 研究员，阿里原初引力波探测实验首席科学家/AliCPT国际合作组发言人。1991年美国洛杉矶加州大学（UCLA）研究生毕业获博士学位，1996年回国在高能...
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