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2025.10.28
A puzzle solved: the world is flat
I will report the solution to a puzzle of more than 40 years' standing: Why is the lower limit on the mass of the Local Group of galaxies inferred from the Timing Argument of Kahn & Woltjer (1959), larger than the upper limit implied by the almost unperturbed Hubble flow which Sandage (1986) measured for nearby galaxies.BIOProf. Simon D. M. White is the Emeritus Director at the Max-Planck-Insti...
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2025.10.27
57 Years of Pulsar Research
This talk outlines the personal story of my long career in pulsar research. It began shortly before publication of the first pulsar discovery by Antony Hewish, Jocelyn Bell, et al. In 1968, and is still continuing. I have been involved in many aspects of pulsar research over the years. This talk emphasizes my role in the development of new receiver systems for the Parkes 64m radio telescope in ...
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2025.10.27
Connecting protoplanetary disk observations with planet formation modeling
Structures such as gaps and rings in ALMA observations of protoplanetary disks have long been hailed as signposts of planet formation. However, it is still not clear how common such substructures are, when they become apparent in disks and how they are linked to the formation of planets. In this talk I will describe the latest insights on the commonality and evolution of substructures in disks,...
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2025.10.21
LOFAR Surveys: A New Window on the Universe
The Low-Frequency Array (LOFAR) is a pan-European radio telescope with immense data collection and processing capabilities, making it an unprecedented and powerful instrument for conducting the deepest and widest radio surveys at the lowest frequencies accessible from the ground. Over recent years, we have addressed key issues related to the analysis and calibration of radio data, allowing us t...
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2025.10.23
稀释制冷机及其关键技术研究进展
稀释制冷机是一种能够连续产生10 mK极低温度的制冷系统，广泛应用于凝聚态物理、天文探测和量子计算等领域。本报告将介绍团队在全国产化10 mK脉冲管预冷稀释制冷机的最新进展。首先将介绍全国产化的4 K脉冲管制冷机，其制冷功率为1.4 W @4.2 K，40 W @45 K，最低温度可降至2.15 K，非常适合用于液化3He，并介绍其在1K制冷机中的应用。其次将介绍团队研发的新型同轴对流热开关、以及新型气隙热开关，最大开关比可达1000。最后针...
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2025.10.17
Galactic magnetized halo related to the eROSITA Bubbles
The large-scale structures such as Fermi Bubbles and eROSITA Bubbles provide a unique opportunity to study our Milky Way. However, the nature and origin of these large structures are still under debate. In this talk, I will present the identification of several kpc-scale magnetized structures based on their polarized radio emission and their gamma-ray counterparts, which can be interpreted as t...
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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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