报告讲座
-
格物致理讲坛 第105期：Diffuse interstellar bands in Gaia RVS spectra
Diffuse interstellar bands (DIBs) comprise more than 600 broad absorption features observed between 0.4 and 2.4 microns, widely thought to originate from electronic transitions in complex molecules such as polycyclic aromatic hydrocarbons (PAHs) and fullerenes. As such, DIBs serve as powerful diagnostics for exploring the lifecycle and properties of complex organic material in diverse interstellar environments. The Gaia Radial Velocity Spectrometer (RVS) records two prominent DIBs at 862.1 nm (strong) and 864.8 nm (broad). In this talk, I will present our measurements of these two features in Gaia RVS spectra, along with the released products in Gaia DR3 and FPR. I will further discuss an analysis of the carrier properties of the 862.1 nm DIB, including its spatial distribution, kinematics, and evidence for its cationic nature as revealed by its environmental behavior relative to interstellar dust.
发布者： 发布时间：2025-12-05 11:55:56 -
格物致理讲坛 第104期：LHC和未来高能对撞机：探索中性三规范玻色子耦合的新物理
中性三规范玻色子耦合(nTGC)只能由满足完整电弱对称性的标准模型有效理论(SMEFT)8维以上的算符产生。因此nTGC提供了一个探测超标准模型新物理的独特窗口。我们研究了对nTGC有贡献的纯规范玻色子算符和含Higgs的算符。我们推导了由8维算符产生的中性三规范玻色子顶点(nTGV)并将其与新的形状因子表示对应。通过这对应关系，我们推导出真正自洽的nTGV的形状因子表示并去掉了非物理的高能量依赖项。我们先后研究了高能电子对撞机中e+e−→Zγ，LHC和100TeV pp对撞机中pp(qq)→Zγ过程对CP守恒和CP破缺的nTGC的探测灵敏度并与目前LHC的探测结果进行比较。我们发现在对撞能量不超过1TeV的CEPC, FCC-ee和ILC中对新物理尺度的探测能到(1−5) TeV的范围，LHC能达到的探测灵敏度与它们相当。对于对撞能量在(3−5) TeV的CLIC 可以对新物理尺度探测到(10−16)TeV，而100TeV pp对撞机具备对nTGC更高的探测灵敏度。ATLAS和CMS已经采取我们的方案对LHC Run 2的数据进行分析。我们按现在CEPC的设计参数对nTGC的测量做了探测器模拟分析。
发布者： 发布时间：2025-11-09 12:08:11 -
格物致理讲坛 第102期：太阳磁活动周的时空演化规律
太阳磁活动周的时空演化规律
发布者： 发布时间：2025-11-03 10:14:20 -
The Chang-Yun Fan cosmic ray series 第8期
Cosmic ray studies started more than a hundred years ago, with countless articles and numerous textbooks published. Advanced numerical codes have been developed to describe cosmic ray propagation and acceleration, and, at first glance, the field reached not only its maturity, but even its old age. Thus, it is shocking to find out the fundamental processes that were missed by the generations of earlier researchers or were incorrectly described.To support my point, I will discuss a few topics that I have worked on. Those include perpendicular super diffusion, mirror diffusion,acceleration, and the Levi flights of cosmic rays.
发布者： 发布时间：2025-09-25 09:53:10 -
格物致理讲坛 第101期：关于空间站望远镜在星系中探测相对论效应的思考
暗晕引力领域
发布者： 发布时间：2025-09-22 17:11:36 -
格物致理讲坛 第100期：类星体巡天与超大质量黑洞
类星体巡天与超大质量黑洞
发布者： 发布时间：2025-09-19 15:49:32