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Quantum Gravity 240.5: Quantum Gravity "Demolished" At Universityof Oregon USA
On Apr 1, 9:12*am, OsherD wrote in sci.physics:
From Osher Doctorow D. H. Hsu and David Reeb of the University of Oregon USA, in "Unitarity and the Hilbert space of quantum gravity," 6 pages, arXiv: 0803.4212 v1 [hep-th] 28 Mar 2008, certainly did not plan to "demolish" Quantum Gravity, and indeed suggest way of explaining their results via extra principles, but in fact their paper appears to demolish Quantum Gravity in the following sense. Under assumptions: 1) Physics is unitary, and 2) Black hole evaporation is complete (no topological change, no remnants), then almost the whole volume of semiclassical phase space would not correspond to allowed states in a Quantum theory of Gravity. *It should be noted that the above volume corresponds to highest entropy configurations. "Unitarity" Principle means that knowledge about the state of a system at one time or instant is equivalent to the same at any other time or instant, and seems to allow prediction of the future. *This seems to be obtained from evolution equations between states at two different times. One of the difficulties with Quantum Theory appears to go back to Entropy, while another goes back to Hilbert Space. *I should remind Readers, by the way, that black hole evaporation has been basically the result of Stephen Hawking, whose thermodynamic-Entropy methods are well known, so that if something is wrong with Entropy for example, Hsu and Reeb's results may lead to further (unrestricted?) "demolitions". Some day Einstein zombie world (in the present context "Clausius zombie world" would be more appropriate) will realize in horror that everything is wrong with Entropy: http://philsci-archive.pitt.edu/archive/00000313/ Jos Uffink: "The historian of science and mathematician Truesdell made a detailed study of the historical development of thermodynamics in the period 1822-1854. He characterises the theory, even in its present state, as 'a dismal swamp of obscurity' (1980, p. 6) and 'a prime example to show that physicists are not exempt from the madness of crowds' (ibid. p. 8)...Clausius' verbal statement of the second law makes no sense...All that remains is a Mosaic prohibition; a century of philosophers and journalists have acclaimed this commandment; a century of mathematicians have shuddered and averted their eyes from the unclean...Seven times in the past thirty years have I tried to follow the argument Clausius offers... and seven times has it blanked and gravelled me... I cannot explain what I cannot understand....This summary leads to the question whether it is fruitful to see irreversibility or time-asymmetry as the essence of the second law. Is it not more straightforward, in view of the unargued statements of Kelvin, the bold claims of Clausius and the strained attempts of Planck, to give up this idea? I believe that Ehrenfest-Afanassjewa was right in her verdict that the discussion about the arrow of time as expressed in the second law of the thermodynamics is actually a RED HERRING." Pentcho Valev |
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Quantum Gravity 240.5: Quantum Gravity "Demolished" At Universityof Oregon USA
On Apr 1, 2:54*am, Pentcho Valev wrote:
madness of crowds' (ibid. p. 8)...Clausius' verbal statement of the second law makes no sense...All that remains is a Mosaic prohibition; a century of philosophers and journalists have acclaimed this commandment; a century of mathematicians have shuddered and averted their eyes from the unclean...Seven times in the past thirty years have I tried to follow the argument Clausius offers... and seven times has it blanked and gravelled me... I cannot explain what I cannot understand....This summary leads to the question whether it is fruitful to see irreversibility or time-asymmetry as the essence of the second law. Is it not more straightforward, in view of the unargued statements of Kelvin, the bold claims of Clausius and the strained attempts of Planck, to give up this idea? I believe that Ehrenfest-Afanassjewa was right in her verdict that the discussion about the arrow of time as expressed in the second law of the thermodynamics is actually a RED HERRING." Pentcho Valev From Osher Doctorow: Well said, Pentcho Valev! Osher Doctorow - Hide quoted text - - Show quoted text - |
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