The quest to understand the universe’s expansion and its underlying mechanisms, such as dark energy, has driven astronomers to seek reliable standard candles for measuring cosmological distances in high-redshift environments. While Type Ia supernovae(SNe Ia) have traditionally served this purpose, recent research suggests that Active Galactic Nuclei(AGNs) may also play a crucial role as standard candles. This talk explores the potential of AGNs in cosmological measurements, examining their unique properties, such as luminosity and variability, that could enable precise distance calculations. By investigating AGNs as standard candles, the research team aims to uncover new pathways in measuring cosmological parameters and refining our cosmic models. Following the five-year report from the Dark Energy Survey(DES) and the Australian Dark Energy Survey(OzDES), we will also discuss why the dark energy equations of state might need some revisions.
時間：2025.08.14(四) 19:00~20:30
地點：香港理工大學 R602室
講者：Alan Chan (astronomer, Mount Stromlo Observatory & Centre for Gravitational Astrophysics, Australian National University(ANU))
語言：英語
免費會議，惟參加者需要報名，2025.08.11截止
此活動由香港天文學會 理論天文組主辦。