Cosmic time
= Cosmic time
Cosmic time is the <proper time> measured by observers comoving with the homogeneous cosmological fluid. Constant-cosmic-time hypersurfaces are the homogeneous spatial slices of an FLRW spacetime.
= Cosmic time
Cosmic time is the <proper time> measured by observers comoving with the homogeneous cosmological fluid. Constant-cosmic-time hypersurfaces are the homogeneous spatial slices of an FLRW spacetime.