直播时间：2024年6月7日（周五）20:00-21:30

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https://rmtzx.sciencenet.cn/app/kexuewang/liveShare/#/cathay?broadcastId=61000e84-1871-43ce-90a4-ecb9e1fc48a6（科学网APP直播间链接）

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北京时间2024年6月7日晚八点，iCANX Talks 第189期邀请到了FAST首席科学家Di Li进行分享！此外，美国西北大学Wen Xu，之江实验室 Yi Feng等教授担任嘉宾，北京大学Haixia Zhang教授担任主持人。

这将是一场汇聚顶尖学者的盛会，共同探讨前沿科技与学术挑战！更多精彩，敬请期待！

【嘉宾介绍】

Di Li

FAST首席科学家

Dynamic Universe: A FAST Perspective

【Abstract】

Humans perception and philosophy of the cosmos depend on our collective sensors. Modern optical sky surveys in the 20th century gave rise to the concept of dynamic Universe, the forefront of which currently situated in the radio bands and manifest itself as fast radio bursts (FRB). The discovery of FRBs was awarded the 2023 Shaws prize in astronomy. We built the largest radio telescope, namely, the Five-hundred-meter Aperture Spherical radio Telescope (FAST), which has been leading the field of characterizing repeating FRBs ever since the inception of FASTs operation in 2020. With close to 100 FAST-based papers, including 5 on Nature and 2 on Science, we started to construct an evolutionary picture FRBs. Recently, we invented the Pincus-Lyapunov diagram, which help ascertain the stochastic nature of FRBs, namely, they are less chaotic than Earthquakes, but way more random, akin to a Brownian motion on the energy-time phase space. This stochastic phase represent the presumably young ages of FRBs. We are also working on a next generation FRB machine, namely Cosmic Antennae (CA), the aim of which is to increase the discovery rate by orders of magnitude over all current radio telescopes.

人类的宇宙感知和哲学依赖于我们集体的传感器。20世纪的现代光学天空调查促成了动态宇宙的概念，目前这一概念的前沿位于射电波段，并表现为快速射电暴（FRB）。FRB的发现被授予了2023年的邵逸夫天文学奖。我们建造了最大的射电望远镜，即五百米口径球面射电望远镜（FAST），自2020年FAST开始运行以来，它一直在表征重复FRB领域中处于领先地位。凭借接近100篇基于FAST的论文，包括5篇《自然》杂志和2篇《科学》杂志上的文章，我们开始构建FRB的演化图景。最近，我们发明了Pincus-Lyapunov图，这有助于确定FRB的随机性质，即它们比地震的混沌程度要低，但随机性要大得多，类似于能量-时间相空间中的布朗运动。这种随机阶段代表了FRB可能的年轻年龄。我们还正在开发下一代FRB机器，即宇宙天线（CA），其目的是将发现率提高数个数量级，超过所有当前的射电望远镜。

【BIOGRAPHY】

Dr. Di Li is an outstanding observational astronomer who has served as a project scientist for the FAST (Five-hundred-meter Aperture Spherical radio Telescope) since 2008 and has been the Chief Scientist of FAST since 2018. He has been involved in the construction of FAST from the beginning and has made significant contributions in the field of astron

Dr. Li has achieved remarkable success in radio astronomy research, including proposing a new algorithm using Fourier transformation to solve the dust temperature distribution, discovering interstellar oxygen molecules and various new molecules in space, and naming the Hydrogen Narrow Self-Absorption (HINSA) method. Based on the HINSA method, he has accurately measured the interstellar magnetic field and published his research findings as a cover article in the journal Nature.

Under Dr. Lis leadership, the FAST telescope has made a series of important discoveries, including the first new pulsar and the first new Fast Radio Burst (FRB). His team has also obtained the largest collection of Fast Radio Burst events, which was selected as one of the top ten scientific advancements in China.

Dr. Li has received the Outstanding Science and Technology Achievement Award from the Chinese Academy of Sciences twice and has published over 100 journal articles as the first author or corresponding author, including six in top academic journals such as Nature and Science.

In addition to his research achievements, Dr. Li has also been actively involved in academic organizations, serving as an international member of the Australian National Telescope Steering Committee, Chairman of the Square Kilometre Array (SKA) "Cradle of Life" Science Working Group, and a consultant for the Breakthrough Foundations Listen Initiative.

Dr. Li Dis outstanding contributions have established him as a recognized leader and innovator in the international astronomy community. His research has not only advanced the field of astronomy but also made significant contributions to humanitys exploration of the mysteries of the universe.

李菂博士是一位杰出的观测天文学家，自2008年起担任FAST（五百米口径球面射电望远镜）项目科学家，并从2018年至今担任FAST首席科学家。他全程参与了FAST的建设，并在天文学领域做出了多项重要贡献。

李博士在射电天文学的研究中取得了显著成就，包括提出利用傅立叶变换求解尘埃温度分布的新算法，发现星际氧气分子及多种空间新分子，并命名了氢气窄线自吸收（HINSA）方法。他基于HINSA方法精确测量了星际磁场，并以《自然》杂志封面文章的形式发表了研究成果。

在李博士的领导下，FAST望远镜取得了一系列重要发现，包括首个新脉冲星和首个新快速射电暴（FRB）。他领导的团队还获取了最大的快速射电暴事件集合，该成果入选了中国科学十大进展。

李博士曾两次获得中国科学院杰出科技成就奖，并以第一作者或通讯作者身份发表了100余篇期刊论文，其中包括6篇发表在《自然》和《科学》等顶级学术期刊上。

除了在科研领域的成就，李博士还积极参与学术组织工作，曾担任澳大利亚国家望远镜指导委员会国际委员、平方公里阵（SKA）生命摇篮科学工作组组长、突破基金会聆听计划（Breakthrough Listen）咨询委员等职务。

李菂博士的卓越贡献使他成为国际天文学界公认的领导者和创新者，他的研究成果不仅推动了天文学的发展，也为人类探索宇宙的奥秘做出了重要贡献。