2011/11/19 by Arnaud De Lavallaz, Arnaud DeLavallaz, Malcolm Fairbairn
Physics and Astronomy · #Age of the universe #Astrophysics #Cold dark matter #Computer science #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Galaxies: Formation, Evolution, Phenomena #Logistic regression #Machine learning #Odds #Opacity #Optics #Physics #Theoretical physics #Universe #Void (composites) #astro-ph.CO #astro-ph.HE
paper · pdf · doi:10.1103/physrevlett.108.171301
4 pages 4 figures
arxiv created 2011/11/19 · openalex publication_date 2012/04/27 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We test the opacity of a void universe to TeV energy γ rays having obtained the extragalactic 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 Λ cold dark matter 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.