Colloquium:- First Galaxies in Cold, Warm, and Fuzzy Dark Matter Cosmologies
The near-century-old dark matter(DM) problem is one of the most intriguing mysteries in modern physics. The speaker will discuss how the first galaxies that form in the Universe are a unique probe for the nature of dark matter. These first objects form in low-mass DM potential wells, probing the behavior of DM on kiloparsec(kpc) scales. He will present pioneering simulations of what the young Universe would look like if DM were ultra-light, in the so-called ‘fuzzy dark matter’(FDM) limit where DM is a ~10^-22eV boson, and contrast this against Warm and Cold DM models. The simulations highlight the interplay between baryonic physics and unique wavelike features inherent to FDM, including a new nonlinear formation channel for solitons. Future telescopes like the James Webb will soon offer an observational window into this emergent world. The speaker will further discuss a variety of other small-scale astrophysical consequences of FDM due to its unique substructure, which place independent constraints on the FDM particle mass. He will present prospects to validate or rule out FDM.
時間：2020.11.03(二) 10:30~11:30
頻道：Zoom:947-4493-7941
講者：Dr. Philip MOCZ(Department of Astrophysical Sciences Princeton University, USA)
語言：英語
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【此屬轉載訊息，以主事單位發佈為準】
此活動由香港中文大學物理系主辦。
