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直播二维码
10月28日晚9点，著名天文学家、芝加哥大学Wendy Freedman教授在“哥白尼线上论坛”上的演讲直播，题目是“Tension in the Hubble Constant: Is There a Crisis in Cosmology?”。由蔻享学术和墨子沙龙进行网络直播。![]()
本次直播为Colloquium（学术讨论会）形式，需要一定的物理基础。演讲语言为英文。
题目：
Tension in the Hubble Constant: Is There a Crisis in Cosmology?
时间：
2021年10月28日（本周四）晚9点
主讲：
Wendy Freedman
John & Marion Sullivan University Professor of Astronomy and Astrophysics, The University of Chicago
An important and unresolved question in cosmology today is whether there is new physics that is missing from our current standard Lambda Cold Dark Matter (LCDM) model. Recent measurements of the Hubble constant, H0 -- based on Cepheids and Type Ia supernovae (SNe) -- are discrepant at the 4-5-sigma level with values of H0 inferred from measurements of fluctuations in the cosmic microwave background (CMB). The latter assumes LCDM, and the former assumes that systematics have been fully accounted for. If real, the current discrepancy could be signaling a new physical property of the universe. I will present new results based on an independent calibration of SNe Ho based on measurements of the Tip of the Red Giant Branch (TRGB). The TRGB marks the luminosity at which the core helium flash in low-mass stars occurs and provides an excellent standard candle. Moreover, the TRGB method is less susceptible to extinction by dust, to metallicity effects, and to crowding/blending effects than Cepheid variable stars. I will address the current uncertainties in both the TRGB and Cepheid distance scales, as well as discuss the current tension in H0 and whether there is need for additional physics beyond the standard LCDM model.
Wendy Freedman：天文学家，因对哈勃常数的测量而闻名。她的主要研究方向是观测宇宙学，特别是对现在和过去宇宙膨胀率的测量，以及对暗能量性质的观测研究。曾获得麦哲伦奖（2002年）、格鲁伯宇宙学奖（2009年）、丹尼·海涅曼天体物理学奖（2016年）等。
墨子沙龙是以中国先贤“墨子”命名的大型公益性科普论坛，由中国科学技术大学上海研究院主办，中国科大新创校友基金会、中国科学技术大学教育基金会、浦东新区科学技术协会、中国科学技术协会及浦东新区科技和经济委员会等协办。
墨子是我国古代著名的思想家、科学家，其思想和成就是我国早期科学萌芽的体现，“墨子沙龙”的建立，旨在传承、发扬科学传统，建设崇尚科学的社会氛围，提升公民科学素养，倡导、弘扬科学精神。科普对象为热爱科学、有探索精神和好奇心的普通公众，我们希望能让具有中学同等学力及以上的公众了解、欣赏到当下全球最尖端的科学进展、科学
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