linkedin post 2021-06-24 04:24:21

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DOWNSIZING. “Observational studies have revealed a ‘downsizing’ trend in black hole (BH) growth: the number densities of luminous active galactic nuclei (AGN) peak at higher redshifts than those of faint AGN. This would seem to imply that massive BHs formed before low-mass BHs, in apparent contradiction to hierarchical clustering scenarios.” https://lnkd.in/d9JV8md View in LinkedIn
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linkedin post 2021-06-24 04:22:36

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WE START a new paper on the Origin of the antihierarchical growth of black holes, by an international group of collaborators. These important observations about black holes will conclude this lengthy section of black holes and we will transition into how black hokes make white holes, and their properties. https://lnkd.in/d9JV8md View in LinkedIn
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linkedin post 2021-06-24 04:21:05

linkedin post 2021-06-24 04:21:05

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SO ENDS this series of papers on the pioneering black hole studies by the late Professor Jacob Bekenstein, a formed student of the great physicist John Wheeler. His work on black hole entropy, connected to Wheeler’s ideas of ‘It from Bit’ have been groundbreaking, and we have largely covered them in these last series of posts. https://en.m.wikipedia.org/wiki/Jacob_Bekenstein View in LinkedIn
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linkedin post 2021-06-24 04:18:27

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JACOB D. BEKENSTEIN has contributed to the foundation of black hole thermodynamics and to other aspects of the connections between information and gravitation. He is Polak Professor of Theoretical Physics at the Hebrew University of Jerusalem, a member of the Israel Academy of Sciences and Humanities, and a recipient of the Rothschild and the Israel prizes. Bekenstein dedicates this article to John Archibald Wheeler (his Ph.D. supervisor 30 years ago). https://lnkd.in/draqjTW View in LinkedIn
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linkedin post 2021-06-23 04:28:24

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GOD IS A GEOMETER. “Tool-use, with its Subject (the tool), Verb (movement of the tool), and Object (the workpiece), and manipulation of mental images, is an extension of the sentence. The sense of truth and falsity shares a common source with the right and wrong answers of arithmetic.” (The human mind’s origins in geometry, an unusual viewpoint) https://lnkd.in/drepKdh View in LinkedIn
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linkedin post 2021-06-25 03:44:44

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CORRELATIONS. “All of these studies in the hard and soft X-ray range find that the cosmic evolution of AGN is strongly dependent on the AGN luminosity: the number density of successively less luminous AGN peaks at lower redshifts, with the lowest luminosity AGN showing a basically constant number density.” (AGN = active galactic nuclei). https://lnkd.in/d9JV8md View in LinkedIn
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