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5D VS 4D SPACETIME. “The correspondence works the other way, too. Witten has shown that a black hole in antide Sitter spacetime corresponds to hot radiation in the alternative physics operating on the bounding spacetime. The entropy of the hole--a deeply mysterious concept--equals the radiation's entropy, which is quite mundane.” https://lnkd.in/draqjTW View in LinkedIn

5D VS 4D PARTICLES. “The holographic equivalence can allow a difficult calculation in the 4-D boundary spacetime, such as the behavior of quarks and gluons, to be traded for another, easier calculation in the highly symmetric, 5-D antide Sitter spacetime.” https://lnkd.in/draqjTW View in LinkedIn

5D VS 4D UNIVERSE CREATURES. “Of course, the structures of their brains might give them an overwhelming commonsense prejudice in favor of one description or another, in just the way that our brains construct an innate perception that our universe has three spatial dimensions.” https://lnkd.in/draqjTW View in LinkedIn

Early summer is also a time when dead flowers and seeds accumulate like autumn leaves. View in LinkedIn

PRE-EXISTING KNOWN TRUTHS. “The mind itself comprehends all ideas and mathematical forms; experience only reminds it of what it knew before” (Johannes Kepler, letter to Hohenburg, 1606) https://lnkd.in/da7dRTF View in LinkedIn

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

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

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

Hazy days of summer with high contrasts of light and shadow, blazing heat and relief. View in LinkedIn