Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-09-30
JHEP 1103:042,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
32 pages, 19 figures; v2: references added, published version
Scientific paper
10.1007/JHEP03(2011)042
We present a systematic cosmological study of a universe in which the visible sector is coupled, albeit very weakly, to a hidden sector comprised of its own set of particles and interactions. Assuming that dark matter (DM) resides in the hidden sector and is charged under a stabilizing symmetry shared by both sectors, we determine all possible origins of weak-scale DM allowed within this broad framework. We show that DM can arise only through a handful of mechanisms, lending particular focus to Freeze-Out and Decay and Freeze-In, as well as their variations involving late time re-annihilations of DM and DM particle anti-particle asymmetries. Much like standard Freeze-Out, where the abundance of DM depends only on the annihilation cross-section of the DM particle, these mechanisms depend only on a very small subset of physical parameters, many of which may be measured directly at the LHC. In particular, we show that each DM production mechanism is associated with a distinctive window in lifetimes and cross-sections for particles which may be produced in the near future. We evaluate prospects for employing the LHC to definitively reconstruct the origin of DM in a companion paper.
Cheung Clifford
Elor Gilly
Hall Lawrence J.
Kumar Piyush
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