【直播】【李政道研究所】Entropy in a Coherent Universe…

学术   2024-11-03 00:01   安徽  



李政道研究所

Entropy in a Coherent Universe: Quantum Information in the Action of the Cosmic SuperWeb


2024年11月4日 13:00


2024年11月4日,由Prof. J. Richard Bond为大家作题为“Entropy in a Coherent Universe: Quantum Information in the Action of the Cosmic SuperWeb”学术报告,由李政道研究所主办,详情如下。

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报告人介绍






Prof. J. Richard Bond

J. Richard Bond is a cosmologist whose theoretical work ranges from the ultra-early to the ultra-late universe, with influential works on the nature and behaviour of dark matter and energy, on inflation in the early and late universe, and on the ‘cosmic web’ paradigm for the dynamics of structure formation from random density fields and the distribution and state of gas in the universe that this engenders. He is best known for developing the theory and analysis of cosmic microwave background radiation fluctuations into a high precision tool for exploring the cosmos. A University Professor (University of Toronto’s Highest Honour for Professors), he is a founding member and former director of the Canadian Institute for theoretical Astrophysics. Among his many honors, he received the 2006 Herzberg Gold Medal (the highest Canadian Research Award) and the 2008 Gruber Prize in Cosmology.



报告摘要


von Neumann of (thermal) quantum entropy fame purportedly responded to Shannon asking what his novel classical information content measure should be called: paraphrasing, entropy, nobody understands it anyway. Nowadays thermal entropy, gravitational entropy and information entropy have merged as ideas, at least for me, and expanded to encompass phase info as well as counting info, into quantum information aka quantum cosmology. Its development and transport through all of the great cosmic epochs of instability accompanying transitions of phase is a unifying story of the Universe. It's a big topic which I will meander through, from the speculative emergence of coherence, through an inflation era, its preheating end in the matter-entropy burst, with attention to cosmic neutrino decoupling, the two phases of cosmic photon decoupling, and entropy generation and transport in the gravitationally-unstable nonlinear cosmic web. With applications to observable entropic relics and the cosmic parameters we derive from them, such as the CnuB, CMB, the cosmic infrared background, line intensity mapping, and the thermal state of clusters, groups and the IGM. Whew, and that's not all: one quest is for information-laden Planck-epoch intermittent non-Gaussianities, scalar and gravity-wave, beyond Planck the satellite.



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