Testing the Copernican Principle via Cosmological Observations

Details Testing the Copernican Principle via Cosmological Observations Testing the Copernican Principle via Cosmological Observations

2008-07-18

arxiv.org/abs/0807.2891v2

JCAP 0902:020,2009

Astronomy and Astrophysics

Astrophysics

16 pages, 9 figures; accepted for publication in JCAP

Scientific paper

10.1088/1475-7516/2009/02/020

Observations of distances to Type-Ia supernovae can be explained by cosmological models that include either a gigaparsec-scale void, or a cosmic flow, without the need for Dark Energy. Instead of invoking dark energy, these inhomogeneous models instead violate the Copernican Principle. we show that current cosmological observations (Supernovae, Baryon Acoustic Oscillations and estimates of the Hubble parameters based on the age of the oldest stars) are not able to rule out inhomogeneous anti-Copernican models. The next generation of surveys for baryonic acoustic oscillations will be sufficiently precise to either validate the Copernican Principle or determine the existence of a local Gpc scale inhomogeneity.

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