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Space expansion is a cosmological phenomenon wherein the proper distance between two spatial points for a given inertial reference frame increases from one moment of time to another. That is, space itself expands; the added distance is not due to relative motion of points or objects.

4
votes
1answer
My books on General Relativity do not tell anything about the following and I would like to clarify this thing. Consider only the open FLRW universe ; $k = -1$ (also called hyperbolic universe), of t …
asked Sep 6 '16 by Cham
7
votes
2answers
I'm looking for references on Lemaître's "hesitating" universe models, defined by a long period of stagnation of the cosmological scale factor. These models are using a cosmological constant $\Lambda …
asked Dec 16 '16 by Cham
8
votes
0answers
While writing my notes on cosmology in general relativity and the Olber's paradox, I was wondering about the color of the deep background of space. Our universe is mostly black because light didn't h …
asked Oct 17 '16 by Cham
12
votes
1answer
I'm studying a Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmology model with a simple scalar field as source (no dust-like matter, no radiation, no cosmological constant). For the moment, the field …
asked Dec 19 '16 by Cham