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2026.04.22
Metallicity as an Astrophysical Diagnostic
Metallicity is one of the most powerful diagnostics of galaxy formation and evolution, encoding the cumulative history of gas accretion, star formation, feedback, and assembly. In this talk, I will begin with two basic mass-continuity equations governing gas and metal evolution in galaxies, showing how their analytic behaviour naturally explains a wide range of observed scaling relations. I wil...
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2026.03.31
Dark Energy and Neutrino Mass – the Latest Hints from DESI Using Baryon Acoustic Oscillations
The DESI collaboration (Dark Energy Spectroscopic Instrument) confirmed its groundbreaking results on dynamical dark energy through the largest 3-dimensional Universe map it observed. This talk highlights how DESI’s Baryon Acoustic Oscillation (BAO) measurements from Data Release 2 further challenge the ΛCDM paradigm, the standard cosmology for the past 30 years. The second part of this talk ...
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2026.03.25
4MOST-Cosmology Redshift Survey: Overview
In this talk, I will present the 4-metre Multi-Object Spectroscopic telescope as well as the recent news related to the on-going Science Phase Verification which aims to make different tests for all 4MOST science cases. I will in a second time present in more details the Cosmology Redshift Survey, especially the Bright Galaxies and Luminous Red Galaxies samples, as well as the quality checks an...
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2026.03.11
Simulating Accretion and Early Light Curve in Tidal Disruption Event (TDE)
The tidal disruption of a star by a supermassive black hole and consequent accretion can lead to a transient electromagnetic flare in multiple bands. However, the origin of the detected emission from such tidal disruption events (TDEs) remains an open question. In this talk, I will discuss the potential emission mechanisms in TDEs during accretion disk formation, implied by series of 3D radiati...
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2026.06.04
Galaxy-dark matter connection星系-暗物质关联
Galaxies form within the cosmic web dominated by dark matter. Investigating and establishing the connection between galaxies and dark matter is crucial for research in cosmology, large-scale structure, and galaxy formation. In this talk, I will present our recent studies in this area. On large scales, we have developed a set of methods that can reconstruct the initial conditions of the dark mat...
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2026.05.28
Orbital Architecture of Planetary Systems Formed by Gravitational Scattering and Collisions
In the standard formation models of terrestrial planets in the solar system and close-in super-Earths recently discovered by exoplanet observations, planets are formed by giant impacts of protoplanets or planetary embryos after the dispersal of protoplanetary disk gas in the final stage. This study aims to clarify a fundamental scaling law for the orbital architecture of planetary systems forme...
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2026.05.21
From Flares to Feedback: The Multi-Scale Lives of Supermassive Black Holes
This talk will first briefly introduce active galactic nuclei (AGNs), followed by a presentation of seven recent studies on tidal disruption events (TDEs), AGN quasi-periodic oscillations (QPOs), and AGN feedback: (1) Identification of a candidate intermediate-mass black hole TDE through comprehensive multi-wavelength observational analysis; (2) Discovery of a possible supermassive black hole b...
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2026.05.14
AGN Feedback Across Scales using MACER: From Cooling Flows to X-ray Profiles
AGN feedback is widely invoked to regulate hot gas in galaxies and clusters, yet most existing models remain phenomenological and lack predictive power. I will present results from the MACER framework, a physically grounded model that self-consistently links black hole accretion to radiative and mechanical feedback. Across both cluster and galactic scales, MACER achieves predictive, parameter-f...
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2026.05.07
Searching for Wandering Worlds -- Discovering Isolated Black Holes and Free-Floating Planets with Microlensing
Galactic microlensing is the only known method for detecting dark objects ranging from isolated stellar-mass black holes (BHs) to low-mass free-floating planets (FFPs). Our success in the interferometric resolution of microlensed images with the VLTI has opened a new avenue for identifying isolated stellar remnants. I will discuss how VLTI-GRAVITY+ can potentially discover a large sample of BHs...
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2026.04.23
Closeby Habitable Exoplanet Survey (CHES): An Astrometry Mission to Explore Nearby Habitable Worlds
The detection and study of potentially habitable exoplanets is a cutting-edge topic in contemporary astronomy. The National Medium- and Long-Term Development Plan for Space Science (2024–2050) has been officially released, identifying “Nearby Habitable Exoplanets” as one of its key scientific frontiers. The Closeby Habitable Exoplanet Survey (CHES) (http://www.ps.pmo.cas.cn/CHES/)) aims to s...
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