天空中的幻影：非热暗物质、引力子问题和Cosmic Ray异常
Mirage in the Sky: Non-thermal Dark Matter, Gravitino Problem, and Cosmic Ray Anomalies
摘要：
最近宇宙射线的异常现象可能是由于银河系中的暗物质湮灭造成的。为了获得所需的大截面来解释数据，同时仍然获得正确的遗迹密度，我们依赖于暗物质冻结和大爆炸核合成（BBN）之间的非标准热历史。我们表明，通过重模量甚至引力子衰变的再加热阶段，如果暗物质的自湮灭截面足够大，我们可以产生正确的遗迹密度。除了拟合最近的数据，这个方案解决了宇宙学模量和引力子问题。我们以U（1）_{B-L}扩展的MSSM为例说明了这种机制，其中超对称性通过海市蜃楼中介被破缺。这些由弦激发的模型自然包含了重模量衰变到引力子，随后衰变到LSP可以在低温下重新加热宇宙。右旋超中微子和B-L高真中微子都可以成为具有大截面的暗物质候选者。它们是亲轻子的，因为B-L电荷。我们还表明，它是可以区分的非热的热的情况下（使用索末菲增强）在直接检测实验的某些区域的参数空间。
英文摘要：
Recent anomalies in cosmic rays could be due to dark matter annihilation in our galaxy. In order to get the required large cross-section to explain the data while still obtaining the right relic density, we rely on a non standard thermal history between dark matter freeze-out and Big-Bang Nucleosynthesis (BBN). We show that through a reheating phase from the decay of a heavy moduli or even the gravitino, we can produce the right relic density of dark matter if its self-annihilation cross-section is large enough. In addition to fitting the recent data, this scenario solves the cosmological moduli and gravitino problems. We illustrate this mechanism with a specific example in the context of U(1)_{B-L} extended MSSM where supersymmetry is broken via mirage mediation. These string motivated models naturally contain heavy moduli decaying to the gravitino, whose subsequent decay to the LSP can reheat the universe at a low temperature. The right-handed sneutrino and the B-L gaugino can both be viable dark matter candidates with large cross-section. They are leptophilic because of B-L charges. We also show that it is possible to distinguish the non-thermal from the thermal scenario (using Sommerfeld enhancement) in direct detection experiments for certain regions of parameter space.
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