Physics
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Cosmic time
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Cosmic time
The cosmic time is a criterium of definition and measurement of time adopted by cosmologists, which takes as reference the local conditions of some parameters such as the rate of expansion of the chronotope, the local density of galaxies, the temperature of the microwave background radiation, the gravitational red shift etc. in order to establish a time scale marked by the progressive evolution (local) of the parameters themselves.
An observer will note identical cosmic times if the measurement of cosmological parameters related to two different points of the Universe gives identical results.
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