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Commentaire de Pentcho Valev

sur 2 La gravité quantique élaborée comme une physique de l'information


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Pentcho Valev 8 mars 2016 12:12

@Bernard Dugué « Vous noterez que votre remarque sur le temps n’a aucun sens » 


Au contraire, c’est le problème fondamental (au moins dans le monde anglophone) :

https://edge.org/response-detail/25477 
 What scientific idea is ready for retirement ? Steve Giddings : « Spacetime. Physics has always been regarded as playing out on an underlying stage of space and time. Special relativity joined these into spacetime... (...) The apparent need to retire classical spacetime as a fundamental concept is profound... » 

https://www.youtube.com/watch?v=U47kyV4TMnE 
 Nima Arkani-Hamed (06:11) : « Almost all of us believe that space-time doesn’t really exist, space-time is doomed and has to be replaced by some more primitive building blocks. » 

http://www.newscientist.com/article/mg22029410.900 
 New Scientist : « Saving time : Physics killed it. Do we need it back ? (...) Einstein landed the fatal blow at the turn of the 20th century. » 

https://www.newscientist.com/article/mg22730370-600-why-do-we-move-forwards-in-time/ 
 « [George] Ellis is up against one of the most successful theories in physics : special relativity. It revealed that there’s no such thing as objective simultaneity. Although you might have seen three things happen in a particular order – 
A, then B, then C – someone moving 
at a different velocity could have seen 
it a different way – C, then B, then A. 
In other words, without simultaneity there is no way of specifying what things happened »now« . And if not »now« , what is moving through time ? Rescuing an objective »now« is a daunting task. » 

http://www.guardian.co.uk/books/2013/jun/10/time-reborn-farewell-reality-review 
 « And by making the clock’s tick relative - what happens simultaneously for one observer might seem sequential to another - Einstein’s theory of special relativity not only destroyed any notion of absolute time but made time equivalent to a dimension in space : the future is already out there waiting for us ; we just can’t see it until we get there. This view is a logical and metaphysical dead end, says Smolin. » 

http://www.bookdepository.com/Time-Reborn-Professor-Physics-Lee-Smolin/9780547511726 
 « Was Einstein wrong ? At least in his understanding of time, Smolin argues, the great theorist of relativity was dead wrong. What is worse, by firmly enshrining his error in scientific orthodoxy, Einstein trapped his successors in insoluble dilemmas... » 

http://www.newscientist.com/article/mg20727721.200-rethinking-einstein-the-end-of-spacetime.html 
 « Rethinking Einstein : The end of space-time (...) The stumbling block lies with their conflicting views of space and time. As seen by quantum theory, space and time are a static backdrop against which particles move. In Einstein’s theories, by contrast, not only are space and time inextricably linked, but the resulting space-time is moulded by the bodies within it. (...) Something has to give in this tussle between general relativity and quantum mechanics, and the smart money says that it’s relativity that will be the loser. » 

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