linkedin post 2021-04-25 05:17:37
A veritable tome by a veritable genius. View in LinkedIn
linkedin post 2021-04-26 04:38:32
CLUELESS. “For all the evidence we have, black holes may well exhibit unusual and unexpected thermodynamic behaviour—or none at all. It is certainly not automatic that the Generalized Second Law holds.” https://lnkd.in/dHGT8xw View in LinkedIn
linkedin post 2021-04-26 04:39:26
THE ARGUMENT. “Bekenstein’s argument can be broken down as follows:" "The universe as a whole has an entropy. (ii) The Second Law is a universal law, i.e., applies to the universe as a whole; in particular (a generalization of) it still obtains in the presence of black holes.” https://lnkd.in/dHGT8xw View in LinkedIn
linkedin post 2021-04-26 04:41:29
THE ARGUMENT. “(iii) The Second Law can only hold in the presence of black holes if the black holes present have an entropy contributing to the total entropy of the universe.“ https://lnkd.in/dHGT8xw View in LinkedIn
linkedin post 2021-04-26 04:42:27
THE ARGUMENT. “(iv) The area of the event horizon of a black hole is the only property of a black hole which is formally similar to ordinary thermodynamic entropy in that they both tend to increase over time. (Etc).” https://lnkd.in/dHGT8xw View in LinkedIn
linkedin post 2021-04-26 04:43:21
THE CONDITION. “We can only be certain that the Second Law continues to hold in the presence of black holes if the black holes present have an entropy contributing to the total entropy of the universe.” https://lnkd.in/dHGT8xw View in LinkedIn
linkedin post 2021-04-26 04:44:18
THE CONTEXT. “One of the founding fathers of the physics-is-information school was of course John Archibald Wheeler—Bekenstein’s PhD advisor! Wheeler (1990) is arguably his most pronounced articulation of the idea that physical objects depend in their very existence on information, as captured in the slogan ‘It from bit’.” https://lnkd.in/dHGT8xw View in LinkedIn
linkedin post 2021-04-26 04:45:54
THE END OF KNOWN PHYSICS. “The reader may well worry how the mass-energy of a single black hole could be converted into that for an entire universe, which might well be more than 10(22) times more massive. Indeed, but since some unknown physics is needed in order to circumvent the singularity and alter the fundamental constants, ‘all bets are off’ with regard to the standard conservation laws of conventional physics.” (The Road to Reality, Roger Penrose). https://en.m.wikipedia.org/wiki/The_Road_to_Reality View in LinkedIn
linkedin post 2021-04-26 04:48:01
Large scale building art in Girona, easily visible by the train. View in LinkedIn
linkedin post 2021-04-27 04:54:31
THE MISCONCEPTION. “Black holes in equilibrium having the same set of three parameters may still have different ‘internal configurations’...”These quotes betray the same misconception: fundamental physics is about the objective structure of our world, not about our beliefs or our information.” https://lnkd.in/dHGT8xw View in LinkedIn