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

Дата и время публикации : 2011-11-19T19:25:44Z

Авторы публикации и институты :
Arnaud De Lavallaz
Malcolm Fairbairn

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 4 pages 4 figures
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO, astro-ph.HE

Краткий обзор статьи: 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.

Category: Physics