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cianfa72
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Therefore in this case the proper time ##\tau## along each of the comoving observer paths is equal to the coordinate time ##t##. That means clocks carried by comoving observers are synchronized on a specific spacelike hypersurace (the ##t=\tau=0## hypersurface).Orodruin said:However, in RW coordinates that factor is one and so ##\tau = t##, ie, the coordinate time is the proper time of the comoving observers. This is by construction.
From a physical point of view what does it mean ?