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發表於 2017-9-20 00:15:10
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物理定律會在強重力場下改變嗎？ @香港中文大學物理系
Seminar:- Do the Laws of Physics Vary in the Presence of Strong Gravitational Fields?
Searches for variations in fundamental constants provide important tests of new theoretical work that predicts variations of fundamental constants. Spectroscopy of white dwarf photospheres allow us to probe regions where the gravitational potential is over 10,000 times greater than on Earth. Recent UV spectra from the Hubble Space Telescope revealed hundreds of narrow absorption lines that permit a direct probe for new physics in these strong gravitational fields. The speaker will present new results, based on comparing laboratory measurements with Hubble Space Telescope spectra that hint at a possible dependence.
時間：2017.09.21(四) 13:30 ~ 14:15
地點：香港中文大學 科學館北座G25室
講者：Prof. John Webb (School of Physics, University of New South Wales, Australia)
語言：英語
免費講座，歡迎參加
星際塵粒的組成和走向 @香港中文大學物理系
Seminar:- Composition and Alignment of Interstellar Dust Grains
Astronomers have known about interstellar dust particles for almost a century, and for most of this time we have also known that these spinning grains somehow become aligned with respect to the ambient galactic magnetic field. However, our knowledge of the grains’ composition is very incomplete, as is our understanding of the grain alignment mechanism. Such information is needed if we are to (a) efficiently exploit polarimetry of aligned grains to study the role of magnetic fields in star/planet formation, and (b) remove the contaminating dust signal from cosmological observations of gravity waves from the inflationary epoch. The speaker will review established facts and knowledge gaps in these areas, and show how measurements of the polarization spectrum of dust emission are allowing us to make progress in filling in the gaps. As an example, the speaker will discuss the first measurement of the submillimeter polarization spectrum of a translucent molecular cloud, made using BLASTPol, a balloon-borne telescope flown over Antarctica in 2012.
時間：2017.09.26(二) 14:30 ~ 15:30
地點：香港中文大學 潤昌堂101室
講者：Professor Giles NOVAK (Department of Physics and Astronomy Northwestern University, USA)
語言：英語
免費講座，歡迎參加
中秋迎月晚會 @崇基學院 鄧雁玲科學普及教育中心
中心將舉辦迎月晚會，除講座外，參加者亦可以使用中心設置的望遠鏡賞月觀星。 活動舉行期間，將有專人向參加者介紹當晚星空及指導觀星技巧，而每位參加者更可獲贈中心印製的精美旋轉星圖乙個。
◎每季星空巡禮 講座
時間：2017.09.27(三) 18:30
地點：香港中文大學 崇基學院謝昭杰室
講者：王永雄 博士 (大學通識教育部)
語言：粵語
◎觀星活動
時間：講座結束後 ~ 20:30
地點：鄧雁玲科學普及教育中心 崇基圖書館頂層
若遇天氣欠佳，觀星活動可能取消
免費活動，歡迎任何有興趣人士參加
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