Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-12-29
Phys.Rev.Lett.100:191303,2008
Astronomy and Astrophysics
Astrophysics
4 pages. Version matching the published text in PRL
Scientific paper
10.1103/PhysRevLett.100.191303
We present the time drift of the cosmological redshift in a general spherically symmetric spacetime. We demonstrate that its observation would allow us to test the Copernican principle and so determine if our universe is radially inhomogeneous, an important issue in our understanding of dark energy. In particular, when combined with distance data, this extra observable allows one to fully reconstruct the geometry of a spacetime describing a spherically symmetric under-dense region around us, purely from background observations.
Clarkson Chris
Ellis George F. R.
Uzan Jean-Philippe
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