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2025.12.19
主流极低温制冷技术及其典型应用
随着量子技术的兴起以及天文观测等前沿研究的进一步深入，对于极低温技术的需求愈加旺盛。目前主要应用集中在20mK-300mK制冷温区，冷量大小在数μW至数百μW量级。主流的极低温制冷机包括吸附制冷机（250mK-1K）、绝热去磁制冷机(>30mK)以及稀释制冷机（>5mK）。本报告主要介绍三种极低温制冷技术以及近年来相关领域的代表性进展，同时介绍极低温技术的典型应用，并对未来技术发展趋势做一些初步探讨。报告人简介：戴巍，中国科...
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2025.12.19
Disk Population Synthesis of structured disks with external photoevaporation
With the ever-increasing census of protoplanetary disks observed in mm emission, disk population synthesis studies have become an important tool to constrain expected disk properties and the occurrence of sub-structures. Previous studies have revealed that the observed spectral indices are consistent with ubiquitous substructures emerging at early times. However, it still remains challenging to...
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2025.12.19
The 60 years of cosmic microwave background radiation (1965-2025): where new physics may emerge?
The measurements of the cosmic microwave background radiation is the pillar of modern precision cosmology. In this talk, I will give a brief overview of the experimental evolution of the cosmic microwave background radiation and highlight its phenomenal success and distinctive challenges. I will also discuss the current outstanding questions in modern cosmology and the prospects of the emergenc...
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2025.12.15
Connecting the Dots: From Electrons to Planets
Most exoplanets likely begin life wrapped in hydrogen–helium envelopes that interact intensely with their molten or supercritical interiors for millions to billions of years. Yet, despite their pivotal role in shaping planetary formation, evolution, and atmospheric composition, our fundamental physical and chemical understanding of these interactions remains limited, in large part because they...
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2025.12.08
Particle acceleration and emission in jets of microquasars and active galactic nuclei
The origin of cosmic rays (CRs) remains an open question. The CR spectrum is characterized by two significant breaks: the knee at ~3 PeV (PeV=1e15 eV) and the ankle at ~3 EeV (EeV=1e18 eV). It is widely accepted that ultra-high-energy cosmic rays (UHECRs) above the ankle originate from extragalactic sources, with the transition energy between galactic and extragalactic components lying between ...
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2025.12.03
The use of the quasar dataset on Cosmology: consequences and prospects
We try to find an optimized methodology to constrain the cosmological parameters using the quasar dataset. Quasars can be the potential cosmic probe that can fill up the gap between the farthest observed Type Ia Supernovae and the Cosmic Microwave Background CMB. Quasars can be observed to the highest redshift of z ≈ 7.1. It can give valuable insight into the tensions of the cosmological param...
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2025.12.08
Tracing Cosmic Evolution: From the CMB to the Web, the CGM, and Galactic Disks
This is the abstract: Understanding how galaxies form and evolve remains one of the central challenges in modern astrophysics. In this talk, I will present my research over the past decade on the multi-scale processes that govern galaxy formation, from the initial conditions imprinted in the cosmic microwave background to the assembly of galactic disks.I will show that the effect of the cosmic ...
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2025.12.03
Hunting for strong gravitational lenses with Euclid
Euclid is a class-M space mission by ESA launched in July 2023. In the course of its six years lifetime, it will observ ~14,000 sq. degrees of the extragalactic sky with the aim of understanding the nature of dark matter and dark energy combining multiple cosmological probes such as weak lensing and galaxy clusters. Being designed for accurate shape measurements from space and having a space re...
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2025.12.23
A new multiprobe analysis of modified gravity and evolving dark energy
Dark energy has attracted renewed attention since DESI reported a possible dynamical behavior crossing the cosmological constant boundary, favoring the (w0,wa) parametrization over a cosmological constant at more than 3\sigma. This apparent evolution is a manifestation of some discrepancies between DESI BAO, Planck CMB and supernovae measurements. An independent probe from DESI and SN is theref...
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2025.11.27
OJ 287: The Rosetta Stone of Supermassive Black-Hole Binaries
Recent observational campaigns and theoretical investigations strongly indicate the presence ofa spinning supermassive black hole binary that spirals in due to the emission ofnano-Hertz gravitational waves in bright blazar OJ 287.I will briefly describe these efforts while focusingon our August 2019 observations and their implications.Additionally, I will touch upon our ongoing efforts, relev...
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