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2026.09.28
Understanding the inner structure of galaxy clusters with strong lensing: from detailed modeling to statistical lensing
The inner regions of galaxy clusters provide critical testing grounds for the predictions of the CDM paradigm, particularly in light of results from high-resolution numerical simulations. At the same time, they offer a unique laboratory for investigating how dense environments influence the formation and evolution of galaxies.Strong gravitational lensing provides a powerful probe of the cluster...
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2026.09.08
Why Dark Matter May Have Self-Interactions
Dark matter makes up most of the matter in the Universe, yet its fundamental nature remains unknown. In this talk, I will present recent high-resolution N-body simulations of self-interacting dark matter and discuss their implications for a wide range of astrophysical observations. I will highlight new signatures associated with gravothermal collapse in dark matter halos and show how they may b...
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2026.09.07
中子超流涡旋的脉冲星效应
1)研究了中子星内部超流涡旋运动中子的中微子辐射，给出了长周期脉冲星的自转周期规律(2017年被天文观测证实);2)通过中子星的中微子辐射解释了高速中子星这种特殊的宇观现象。个人简介：彭秋和，南京大学天文与空间科学学院教授、博士生导师。1960年毕业于南京大学；1960年至1978年任教于北京大学，1978年调回南京大学。曾任多届中国天文学会及全国引力和相对论天体物理学会理事。主要从事核天体物理、高能天体物理及星系天文学...
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2026.08.26
No Cluster Left Behind: Multiwavelength Cluster Analysis with All the Data
Cluster abundance is among the most powerful cosmological probes, but its constraining power is currently limited by systematic uncertainties in mass calibration. Optically selected samples in particular suffer from line-of-sight projection effects that bias both richness and lensing measurements. Jointly modeling clusters observed across multiple wavelengths offers a path to self-calibrating t...
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2026.08.26
Nebular_AGN: A CIGALE module for fitting active galactic nucleus emission lines
Active galactic nuclei (AGN) play a crucial role in regulating star formation and galaxy evolution. With the upcoming next-generation high-redshift, wide-field, multi-object spectroscopic surveys, it is increasingly important to efficiently identify AGN candidates from massive survey data and infer their physical properties via spectral and emission-line characteristics. To address this, we hav...
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2026.08.25
The Hubble tension and other astrophysical issues in the context of scale invariance
Cosmological models require a gage. One of them, considered already by Dirac is to consider that gravity is scale invariant in the vacuum (SIV). This was abandoned as the Universe is not completely empty, but as always in science everything is a matter of approximation. Assuming the universe is sufficiently empty, Maeder re-considered SIV and showed that it can easily explain phenomenon over a ...
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2026.08.18
复杂演化的新统计拓扑理论
在二十世纪对人类世界观重塑的科学进展中，以湍流与混沌学为代表的复杂系统甚至难以用传统的理论范式研究。湍流是物理学最具有挑战性的问题之一，作为一种宇宙中极为广泛存在的现象，是具有代表性的复杂系统问题。一般而言，复杂系统因为具有混沌效应与群体涌现行为，可积系统与作用量等传统分析预测手段是局限的。本次报告中，我将介绍一种新的统计拓扑理论，可以普适性刻画研究复杂系统的结构与演化。在新理论框架中，无论是...
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2026.08.12
Strong lensing meets stellar dynamics: from cosmology to galaxy evolution
Time-delay cosmography with strongly lensed quasars measures the Hubble constant independently of the distance ladder and the CMB, but its accuracy is limited by the mass-sheet degeneracy (MSD), which lensing data alone cannot break. Stellar dynamics of the lens galaxy provides the missing information. I will present GLaD, a GPU-accelerated framework for self-consistent joint modeling of strong...
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2026.07.21
A Semi-Analytical Loss Cone Theory for Tidal Disruption Event Rates Around Kerr Black Holes
I discuss how strong gravity shapes tidal disruption event rates around spinning Kerr black holes. Spin makes the disruption and direct-capture boundaries depend on orbital inclination, turning the classical loss-cone problem into a two-dimensional diffusion problem in angular-momentum magnitude and orientation. I show a metric-to-rate calculation that connects relativistic orbital and tidal dy...
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2026.07.15
杨晓峰报告
2025年DESI观测结果明显支持动态暗能量；DESI和JWST等观测挑战了ΛCDM模型，我们尝试探索其它非标准模型如Kolb滑行宇宙，即匀速膨胀宇宙模型。这个模型也需要暗能量，但其底层动力学框架仍然空白。我们提出熵起源的滑行宇宙暗能量模型，发现非广延统计物理中的Tsallis熵恰好满足该暗能量的熵起源。另一方面，宇宙学原理和广义相对论都精确成立是ΛCDM模型的两大基石，也是暗能量存在的逻辑前提。近年有Ia超新星、星系四点关联函...
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