The discussion centers on the definition of "space" in cosmology, specifically addressing the inadequacy of 3-D Cartesian space for describing cosmological distributions. Participants highlight that a spacelike slice of constant time in standard cosmological coordinates is a more appropriate framework. Furthermore, it is established that if the universe is spatially flat, then 3-D Cartesian space can be a valid description according to current cosmological models.
PREREQUISITESAstronomers, cosmologists, and physics students interested in the spatial frameworks used in cosmological studies and the distribution of matter in the universe.
Stephen Tashi said:What definition of "space" is used when defining spatial distributions of things in cosmology?
Stephen Tashi said:I assume 3-D cartesian space is not an adequate description for things at the cosmological scale.