對於不少天文愛好者來說，「黑洞」這個名詞並不陌生。由最初的純理論，到至今能觀測的的黑洞，你又了解幾多少呢？12月9日夏原吉教授 (Prof. Y.K. Ha)會在他的《廿一世紀洞察黑洞》講座中，將帶領大家穿越時空，深入淺出探討黑洞的新發現與最新理論，揭開宇宙的深層秘密。對黑洞有興趣的朋友，歡迎到以下網址報名參加。
報名網址: https://forms.gle/egA4fGt7AipopDzcA
題目：廿一世紀 洞察黑洞 （Black Holes in the 21st Century）
講者：夏原吉 教授 （Prof. Y.K. HA , Temple University, USA)
日期：2025年12月9日(星期二)
時間：19:00-20:30
地點：香港理工大學 HJ302 室 /ZOOM 線上同步進行
語言：英文, 廣東話
費用：免費
名額：現場 100人 (場地有人數限制，收到確認回覆才可現場出席。香港天文學會會員優先。)
截止報名日期: 2025年12月4日 10:00 .a.m.前
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查詢電郵：tag@hkas.org.hk ，主旨請註明〔20251209tag_talk 〕
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香港天文學會
會務部
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題目：廿一世紀 洞察黑洞 （Black Holes in the 21st Century）
講者：夏原吉 教授 （Prof. Y.K. HA , Temple University, USA)
Summary (內容提要)：
New black hole discoveries in the 21st Century have been found by a Hong Kong native. Dr. Ha will first give an introduction to spacetime and its connection to the black hole. He will review the various theorems previously discovered about black holes in the Hawking era and then introduce a new theorem discovered by him – the Horizon Mass Theorem. He will discuss the powerful gravitational energy and other irreducible energies associated with different black holes.
The most important black hole in astrophysics is the rotating black hole also known as the Kerr black hole. New properties of these black holes have been found by Dr. Ha, including rotational inertia, extended structure and the possible removal of singularity. These results will deepen our understanding of what a black hole really is. Black holes are now real astrophysical bodies, and their secrets are to be explored.
Speaker (講者)：Prof. Y.K. HA (夏原吉教授 )
Prof. Ha is a native of Hong Kong, a theoretical physicist with a Ph. D. from Yale University. In the 1980s, he worked in the field of particle physics at New York University and Rockefeller University. Since then, he has been teaching and doing research at Temple University for the last 40 years. His field is general relativity and black hole physics. Currently he is a retired professor of physics.
He was an invited Plenary Speaker at the Sixteenth Marcel Grossmann Meeting on General Relativity and Relativistic Astrophysics in 2021. He has won several awards from the Gravity Research Foundation in U. S. for his work on black holes in the last 20 years.
(ref: 20251209tag_talk)