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" "Time is... the expression of our ignorance of the full microstate.
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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[I]n general relativistic observations there is no preferred independent time variable. What we measure are a number of variables, all on equal footing, and their relative evolution. ...[I]t can be equally read it as the evolution of the variable T<sub>1</sub> as a function of the variable T<sub>2</sub>, or viceversa. Which of the two is the independent variable here?
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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.