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While non-relativistic time is the observable quantity measured (or approximated) by physical clocks, in general relativity clocks measure s along th… - Carlo Rovelli
" "While non-relativistic time is the observable quantity measured (or approximated) by physical clocks, in general relativity clocks measure s along their worldline, not t. The relativistic... t is a freely chosen label with no direct physical interpretation. ...The physical content of a solution of Einstein's equations is not in its dependence on t, but ...in what remains once the dependence on t (and x) has been factored away.
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About Carlo Rovelli
Carlo Rovelli (born May 3, 1956) is an Italian physicist and cosmologist working in the field of quantum gravity. In 1988, Carlo Rovelli, Lee Smolin and Abhay Ashtekar introduced a theory of quantum gravity denoted loop quantum gravity.
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The new coherent picture is not yet available. With all their immense empirical success, G(eneral)R(elativity) and Q(uantum)M(echanics) have left us with an understanding of the physical world which is unclear and badly fragmented. At the foundations of physics there is today confusion and incoherence.
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