What is then the physical content of a solution of Einstein's equations..? ...[C]onsider what is actually measured in general relativistic experiment… - Carlo Rovelli

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What is then the physical content of a solution of Einstein's equations..? ...[C]onsider what is actually measured in general relativistic experiments. ...Consider a clock at rest on ...Earth and a clock on a satellite in orbit around the Earth. ...Call T<sub>1</sub> and T<sub>2</sub> the readings... Each measures the along its own worldline, in the Earth gravitational field. ...the theory predicts the value of T<sub>2</sub> that will be associated to each value of T<sub>1</sub>. Or vice versa.

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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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General relativity has changed our understanding of space and time. ...The spacetime of general relativity ...is likely to be just a classical approximation that loses its meaning in the quantum theory, for the same reason the trajectory of a particle does.

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I am aware that ...[this] answer ...is only one among many possibilities. Other authors have argued that the notion of time is irreducible... Until our theoretical and experimental investigations tell us otherwise... what is important is to put the alternatives clearly on the table...

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