Voids as Alternatives to Dark Energy and the Propagation of Gamma Rays through the Universe

Details Voids as Alternatives to Dark Energy and the Propagation of Gamma Rays through the Universe Voids as Alternatives to Dark Energy and the Propagation of Gamma Rays through the Universe

2011-11-19

arxiv.org/abs/1111.4577v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages 4 figures

Scientific paper

We test the opacity of a void Universe to TeV energy gamma rays having obtained the extra-galactic background light in that Universe using a simple model and the observed constraints on the star formation rate history. We find that the void Universe has significantly more opacity than a Lambda-CDM Universe, putting it at odds with observations of BL-Lac objects. We argue that while this method of distinguishing between the two cosmologies contains uncertainties, it circumvents any debates over fine-tuning.

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