Zoom: https://stockholmuniversity.zoom.us/j/65092053191
"Thermal time and Tolman–Ehrenfest effect: 'temperature as the speed of time'”. Smerlak & Rovelli. Class. Quantum Grav. 28 075007 (2011) https://doi.org/10.1088/0264-9381/28/7/075007
Time in GR defined in terms of changes in statistical properties of a system, applied to the redshift of temperature.