Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-28
In Proceedings of the 22nd Texas Symposium on Relativistic Astrophysics at Stanford University, Dec. 13-17, 2004; paper #1301,
Astronomy and Astrophysics
Astrophysics
6 pages, 8 figures. (Adapted from Poster presented at the 22nd Texas Symposium. Includes minor fixes from the originally publi
Scientific paper
Several problematical epochs in cosmology, including the recent period of structure formation (and acceleration), require us to understand cosmic evolution during times when the basis of FRW expansion, the cosmological principle, does not completely hold true. We consider that the breakdown of isotropy and homogeneity at such times may be an important key towards understanding cosmic evolution. To study this, we examine fluctuations in the high-z supernova data to search for signs of large-scale anisotropy in the Hubble expansion. Using a cosmological-model-independent statistical analysis, we find mild evidence of real anisotropy in various circumstances. We consider the significance of these results, and the importance of further searches for violations of the cosmological principle.
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