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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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2025.08.20
NEXUS: A Spectroscopic Census of Broad-line AGNs and Little Red Dots at 3≲z≲6
In this talk, I will present analysis of a spectroscopic sample of 23 broad-line AGNs (BLAGNs) at 3≲z≲6 selected using F322W2+F444W NIRCam/WFSS grism spectroscopy of the central 100 arcmin2 area of the NEXUS survey. Among these BLAGNs, 15 are classified as Little Red Dots (LRDs) based on their rest-frame UV-optical spectral slopes and compact morphology. The number density of LRDs is ∼1e-5 c...
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2025.07.09
Galaxy growth from the early universe to cosmic noon
Over the past few years, JWST's exquisite sensitivity, wavelength coverage and resolution have dramatically advanced observational studies of distant galaxies. Ground-based facilities have added to this complementary views from wide-area imaging, integral-field spectroscopy and (sub)-mm probes. In this talk, I will share recent discoveries on rapidly maturing galaxies from the first billion yea...
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2025.07.09
The Population of LISA MBHBs: What we have learned from simulations
Massive black holes (MBHs) are found in the centres of most massive galaxies. When two galaxies merge, their respective MBHs are brought together, some of them will eventually coalesce and become powerful sources of gravitational waves (GWs). The detection of GWs from stellar-mass black hole binaries by the Laser Interferometer Gravitational-Wave Observatory (LIGO) marked the dawn of the GW ast...
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