Thoughts on the cosmological principle

Details Thoughts on the cosmological principle Thoughts on the cosmological principle

2009-05-04

arxiv.org/abs/0905.0384v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

10 pages; contribution to "Fundamental Interactions - A Memorial Volume for Wolfgang Kummer", eds. D. Grumiller, A. Rebhan and

Scientific paper

The cosmological principle says that the Universe is spatially homogeneous and isotropic. It predicts, among other phenomena, the cosmic redshift of light and the Hubble law. Nevertheless, the existence of structure in the Universe violates the (exact) cosmological principle. A more precise formulation of the cosmological principle must allow for the formation of structure and must therefore incorporate probability distributions. In this contribution to the Memorial Volume for Wolfgang Kummer, a great teacher and mentor to me, I discuss how we could formulate a new version of the cosmological principle, how to test it, and how to possibly justify it by fundamental physics. My contribution starts with some of my memories of Wolfgang.

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