FIMP dark matter freeze-in gauge mediation and hidden sector
FIMP dark matter freeze-in gauge mediation and hidden sector
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DOI：
10.1088/1361-6471/aac3b9
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发表时间：
2017-10
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影响因子：
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通讯作者：
Kuo-Hsing Tsao
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作者：
Kuo-Hsing Tsao
我们在规范中介框架下探索了暗物质冻结机制，它包括一个隐藏的弱相互作用质量粒子(FIMP)，当信使仍在热浴中时，它与信使场弱耦合。FIMP是一般亚稳态超对称(SUSY)破缺模型中赝模的费米子分量，位于隐藏区。FIMP的遗迹丰度和质量由超对称破裂标度和弱耦合决定。引力子是规范调解框架中的典型暗物质候选者，它伴随着FIMP的冻结而贡献了暗物质遗迹的丰度。隐藏的扇区因此成为双分量，FIMP和Gravitino都位于SUSY打破的隐藏扇区。我们指出，FIMP和Gravitino之间的比率取决于SUSY破缺如何传递给信使。特别是，当FIMP主导隐藏扇区时，引力成为隐藏扇区中的次要贡献者。同时，假设中性微子既是冻结机制中的弱相互作用质量粒子(WIMP)候选暗物质，又是最轻的可观测超对称粒子(LOSP)。我们进一步发现，在我们的冻结规范调解(FIGM)模型的参数空间中，中性微诺对当前暗物质遗迹密度的贡献是次要的。我们的结果将规范调解框架中的SUSY破缺标度与FIMP冻结产生率联系起来，从而为研究隐藏部分的暗物质提供了一个自然和可预测的场景。
We explore the dark matter freeze-in mechanism within the gauge mediation framework, which involves a hidden Feebly Interacting Massive Particle (FIMP) coupling feebly with the messenger fields while the messengers are still in the thermal bath. The FIMP is the fermionic component of the pseudo-moduli in a generic metastable supersymmetry (SUSY) breaking model and resides in the hidden sector. The relic abundance and the mass of the FIMP are determined by the SUSY breaking scale and the feeble coupling. The gravitino, which is the canonical dark matter candidate in the gauge mediation framework, contributes to the dark matter relic abundance along with the freeze-in of the FIMP. The hidden sector thus becomes two- component with both the FIMP and gravitino lodging in the SUSY breaking hidden sector. We point out that the ratio between the FIMP and the gravitino is determined by how SUSY breaking is communicated to the messengers. In particular when the FIMP dominates the hidden sector, the gravitino becomes the minor contributor in the hidden sector. Meanwhile, the neutralino is assumed to be both the Weakly Interacting Massive Particle (WIMP) dark matter candidate in the freeze-out mechanism and the Lightest Observable SUSY Particle (LOSP). We further find out the neutralino has the sub-leading contribution to the current dark matter relic density in the parameter space of our freeze-in gauge mediation (FIGM) model. Our result links the SUSY breaking scale in the gauge mediation framework with the FIMP freeze-in production rate leading to a natural and predicting scenario for the studies of the dark matter in the hidden sector.