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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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2025.09.11
Strong lensing studies with Euclid
Strong gravitational lensing is a powerful tool for astrophysics and cosmology. I will present the Euclid Collaboration's current lens-finding efforts, including the "lens-finding engine" in Euclid's Quick Release 1, and the project I lead on double-source-plane lenses (DSPLs). DSPLs—systems with two Einstein rings at different source redshifts—are uniquely valuable for both cosmological dist...
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2025.08.18
Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations using Lyman alpha forests from DESI and CSST
The Baryon Acoustic Oscillations (BAO) is a powerful large-scale structure probe that is used to constrain dark energy models, and is the main goal of the latest large cosmology survey, eBOSS and Dark Energy Spectroscopic Instrument (DESI). I will present DESI second Data Release (DR2) cosmological results with a particular focus on the measurement of BAO from Lyman-α forest. We measure the is...
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2025.08.15
DESI DR1 Full-Shape analysis: constraining cosmology and mitigating projection effects
Full-shape clustering measurements from DESI DR1 leverage information from the linear to quasi-nonlinear scales to deliver percent-level constraints on cosmological parameters. However, FS analyses relying on broad priors frequently suffer from projection effects, where marginalization over poorly constrained nuisance parameters can bias the inferred posteriors. To address this, we introduce ph...
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