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2025.10.30
Seeing the Missing Worlds Using CMB as a Backlight 宇宙微光中的隐匿世界
During the 14 billion year journey from the last scattering surface to the Earth, cosmic microwave background (CMB) photons were deflected (CMB lensing), stretched (the ISW effect) and scattered (the Sunyaev Zel’dovich effect and patchy screening). The induced secondary CMB anisotropies contain invaluable information on missing baryons, dark matter, dark energy, gravity, and the origin mechani...
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2025.10.23
Metal transport in the interstellar and circumgalactic medium
Observations over the past decade have revealed that galaxies lose many of the metals they produce to the circumgalactic medium, and that the metals they retain are arranged in complex patterns that go beyond simple radial gradients. Theoretical models for how metals move through and out of the interstellar medium to produce these distributions are still in their infancy. In this talk, I discus...
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2025.10.16
Introduction of Muztag-Ata 1.93meter Synergy Telescope and Time-Delay Cosmography
Muztag-Ata 1.93meter Synergy Telescope is general Optical telescope located at Pamir Plateau with Altitude of 4500m.It is constructed by Beijing Normal University, Xinjiang Observatory of CAS, Nanjing Institute of Astronomical Optics & Technology and Xinjiang University.Its instrumentation includes a three-color simultaneous photometer and a double spectrograph.It is a perfect telescope for tim...
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2025.10.09
Dark energy studies with massive galaxy surveys
Large-scale structure has become a precision laboratory for testing gravity and dark energy. I will present recent results from our multi-tracer analyses of SDSS-IV/eBOSS luminous red and emission-line galaxies, using both configuration- and Fourier-space approaches. A key element is a “chained” multipole estimator that suppresses angular systematics, enabling robust use of auto- and cross-co...
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2025.09.25
Observational Planet Formation
It is hard to see a plane cruising at 10 km, as the plane is tiny and faint in the sky. But, if we can see the contrail trailing behind the plane, we know where the plane is. Now, astronomers are applying the same principle to study how planets form by detecting and characterizing the structures that baby planets produce in their birth cradles — protoplanetary disks. This is a new field largel...
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2025.09.18
From cosmic web to molecular clouds: the multiple scales of galaxy evolution
The interstellar medium plays a central role in the galaxy evolution process; it is the reservoir that fuels galaxy growth via star formation, the repository of material formed by these stars, and a sensitive tracer of internal and external processes that affect entire galaxies (e.g. accretion and feedback). This overview talk will discuss how observations of the interstellar medium are sheddin...
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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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2025.08.21
What drove the lunar dynamo?
Although the Moon today has no global magnetic field, paleomagnetic measurements of Apollo samples indicate the existence of an ancient field from at least 4.25 to 1.92 billion years ago. It has been proposed that the paleofield was generated by a core dynamo. However, the paleofield’s apparent high intensity and longevity are major challenges to current theory. Three key difficulties have bee...
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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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