Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-07-29
JCAP09(2011)035
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Accepted for publication in JCAP. Matches published version. Minor changes: ref. added and longer discussion on performing the
Scientific paper
The standard Friedmann model of cosmology is based on the Copernican Principle, i.e. the assumption of a homogeneous background on which structure forms via perturbations. Homogeneity underpins both general relativistic and modified gravity models and is central to the way in which we interpret observations of the CMB and the galaxy distribution. It is therefore important to probe homogeneity via observations. We describe a test based on the fossil record of distant galaxies: if we can reconstruct key intrinsic properties of galaxies as functions of proper time along their worldlines, we can compare such properties at the same proper time for our galaxy and others. We achieve this by computing the lookback time using radial Baryon Acoustic Oscillations, and the time along galaxy world line using stellar physics, allowing us to probe homogeneity, in principle anywhere inside the past light cone. Agreement in the results would be an important consistency test -- although it would not in itself prove homogeneity. Any significant deviation in the results however would signal a breakdown of homogeneity.
Heavens Alan F.
Jimenez Raul
Maartens Roy
No associations
LandOfFree
Testing homogeneity with the fossil record of galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Testing homogeneity with the fossil record of galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Testing homogeneity with the fossil record of galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-318573