کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1851524 1528807 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dark matter self-interactions via collisionless shocks in cluster mergers
ترجمه فارسی عنوان
خود-تعاملات ماده تاریک به وسیله شوک های بی وقفه در ادغام خوشه ها
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
چکیده انگلیسی

While dark matter self-interactions may solve several problems with structure formation, so far only the effects of two-body scatterings of dark matter particles have been considered. We show that, if a subdominant component of dark matter is charged under an unbroken U(1)U(1) gauge group, collective dark plasma effects need to be taken into account to understand its dynamics. Plasma instabilities can lead to collisionless dark matter shocks in galaxy cluster mergers which might have been already observed in the Abell 3827 and 520 clusters. As a concrete model we propose a thermally produced dark pair plasma of vector-like fermions. In this scenario the interacting dark matter component is expected to be separated from the stars and the non-interacting dark matter halos in cluster collisions. In addition, the missing satellite problem is softened, while constraints from all other astrophysical and cosmological observations are avoided.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 749, 7 October 2015, Pages 236–241
نویسندگان
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