Month: September 2022

THE PROBLEM. “In fact, the problem may be considered to run deeper: information, arguably, is an inadmissible concept in fundamental physics. For there to be information in the first place, there must be a communication system in place, a physical set-up such that the concept of information is applicable.” https://lnkd.in/dHGT8xw View in LinkedIn

THE QUALIFICATION. “The recently popular metaphor of the universe ‘being’ a quantum computer can only remain a claim of physics if it is interpreted to mean that the universe is a physical system with a nature that is ultimately best described by a quantum theory, perhaps with a quantum dynamics that produces the ‘steps’ of the computing. A physical system is qualitatively distinct from an abstract object or structure.” https://lnkd.in/dHGT8xw View in LinkedIn

THE ASSUMPTION. “As attempts to formulate a quantum theory of gravity are bedevilled by a frustrating lack of empirical data to guide theoretical work, black hole thermodynamics in general, and the Bekenstein-Hawking formula for the black hole entropy in particular, are widely accepted as physical fact.” https://lnkd.in/dHGT8xw View in LinkedIn

THE FLAW. “This is so even though there is so far no empirical confirmation of any of the thermodynamic aspects of black holes.” https://lnkd.in/dHGT8xw View in LinkedIn

THE MISSING DATA. “Ultimately, as with any substantive claim in empirical science, only the usual kind of experimental and observational work can establish that black holes are thermodynamic objects.” (A great paper). https://lnkd.in/dHGT8xw View in LinkedIn

TIME LAPSE video of space debris. There are some 26,000 items of space junk circulating planet Earth, 200 of which could break into thousands of additional dangerous pieces. We have fouled our nest yet again, imperiling future space activities in our cycle of self-destructive behavior. A must-watch video. https://lnkd.in/dsq8WBF View in LinkedIn

One is made of thin rubber sheets. View in LinkedIn

THE PARADOX. “The black hole information loss problem is one of the most interesting paradoxes. The topic that large amount of information will eventually fall inside the black hole is mainstream. But does a black hole have enough space to accommodate it? How big is a black hole?” https://lnkd.in/dBXZwun View in LinkedIn

ENTROPY. “The increasing entropy of a black hole that evaporates by emitting Hawking radiation is at odds with the predictions of quantum mechanics. Juan Maldacena discusses the latest advances in solving this puzzle, known as the black hole information paradox.” https://lnkd.in/dWkwDQ9 View in LinkedIn