The thermal time hypothesis. In nature, there is no preferred physical time variable t. There are no equilibrium states ρ<sub>0</sub> preferred a pri… - Carlo Rovelli

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The thermal time hypothesis. In nature, there is no preferred physical time variable t. There are no equilibrium states ρ<sub>0</sub> preferred a priori. Rather, all variables are equivalent; we can find the system in an arbitrary state ρ; if the system is in a state ρ, then a preferred variable is singled out by the state of the system. This variable is what we call time.

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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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What makes the difference is the mass. ...[T]he earth is a big mass and it slows down time. If you go to a bigger mass, like Jupiter, it's stronger. If you go near a big star it's stronger. If you're near a black hole... it's even more strong, so strong that if you go very near... time essentially stops down. It goes very, very, very slowly.

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