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- W2034677706 abstract "We study supersymmetric scenarios where the dark matter is the gaugino of an unbroken hidden U(1) which interacts with the visible world only via a small kinetic mixing with the hypercharge. Strong constraints on the parameter space can be derived from avoiding overclosure of the Universe and from requiring successful Big Bang Nucleosynthesis and structure formation. We find that for typical values of the mixing parameter, scenarios with neutralino NLSP are excluded, while scenarios with slepton NLSP are allowed when the mixing parameter lies in the range χ ∼ (10−13−10−10). We also show that if the gravitino is the LSP and the hidden U(1) gaugino the NLSP, the bounds on the reheating temperature from long lived charged MSSM relics can be considerably relaxed and we comment on the signatures of these scenarios at future colliders. Finally, we discuss the case of an anomalously small mixing, χ << 10−16, where the neutralino becomes a decaying dark matter candidate, and derive constraints from gamma ray experiments." @default.
- W2034677706 created "2016-06-24" @default.
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- W2034677706 date "2009-01-07" @default.
- W2034677706 modified "2023-10-17" @default.
- W2034677706 title "Hidden gauginos of an unbroken U(1): cosmological constraints and phenomenological prospects" @default.
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- W2034677706 doi "https://doi.org/10.1088/1475-7516/2009/01/003" @default.
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