学术报告—Cosmic Emulator for China Space Station Telescope

报告摘要：

Many cosmological prediction tools were designed for Stage-III galaxy surveys, and the prediction accuracy does not match the low statistical fluctuations from the powerful on-going and up-coming Stage-IV surveys. Emulator is a straightforward but a high-cost way to push the accurate prediction towards small scales. With the recently finished 129 high resolution N-body simulations within 8D cosmological parameter space, including dynamic dark energy and massive neutrinos, we construct the emulator for the basic statistics CSST survey cares about, including the matter and lensing power spectra and correlation functions. The emulator can provide 1% accuracy for these statistics within several milliseconds.

报告人简介：

报告人余瑜来自上海交通大学天文系，是长聘教轨副教授。余瑜于2013年毕业于中国科学院上海天文台，后在上海天文台从事宇宙学与大尺度结构研究。于2017年加入上海交通大学天文系。余瑜的研究方向面向宇宙的非线性演化，主要围绕宇宙学信息的优化提取和克服巡天的系统误差，研究工作涉及重子声学振荡信号的优化测量方法、弱引力透镜的系统误差去除、近似模拟样本的快速产生等。