Dr. Ganna Ivashchenko

Real space

by Ganna Ivashchenko

Also available as: PDF, LaTeX.
Conceptions of real space and redshift space were introduces in observational cosmology due to the fact that observed redshifts of extragalactic objects are not ``pure'' cosmological redshifts (caused by expansion of the Universe), but are contaminated by gravitationally-induced peculiar velocities of the objects. Speaking about the distances in real space one means that these distances are not contaminated by peculiar velocities (in contrast to redshift-space distances). In fact, only the parallel (to the line-of-sight) components, , of the real- and redshift-space distances, and , differ, while the transversal (perpendicular to the line-of-sight) components, , are assumed to be equivalent.
Alternative definitions:
Ontology information:
Real space
Related papers: