Dark energy and inhomogeneity

Details Dark energy and inhomogeneity Dark energy and inhomogeneity

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jphcs.189a2011e&link_type=abstract

Journal of Physics: Conference Series, Volume 189, Issue 1, pp. 012011 (2009).

Physics

4

Scientific paper

The standard understanding that distant supernova data implies existence of either dark energy or a cosmological constant Λ relies on the assumption of spatial homogeneity of the universe. A large-scale smoothed-out model of the universe ignores small-scale inhomogeneities, but the averaged effects of those inhomogeneities may alter both observational and dynamical relations at the larger scale, mimicking the effect of a cosmological constant. Alternatively large scale spatial inhomogeneity with zero Λ might mimic the effect of a positive cosmological constant. Whether this is the case or not is open to direct observational testing.

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