超冷WIMP：非标准前BBN宇宙学的遗迹
Ultra-cold WIMPs: relics of non-standard pre-BBN cosmologies
摘要：
弱相互作用大质量粒子（WIMP）是大爆炸核合成（BBN）之前极少数的宇宙学探测器之一。我们指出，在WIMP动力学退耦期间和之后，宇宙以非标准方式演化的场景中，退耦时的视界质量尺度可以更小，暗物质可以比标准宇宙学中更冷。这将导致在分层结构形成中的第一对象小得多。在低再热温度的情况下，该效应可能足够大，以显著地增强GLAST和其他探测器中的间接探测信号，最高达两个数量级。
英文摘要：
Weakly interacting massive particles (WIMPs) are one of very few probes of cosmology before Big Bang nucleosynthesis (BBN). We point out that in scenarios in which the Universe evolves in a non-standard manner during and after WIMP kinetic decoupling, the horizon mass scale at decoupling can be smaller and the dark matter WIMPs can be colder than in standard cosmology. This would lead to much smaller first objects in hierarchical structure formation. In low reheating temperature scenarios the effect may be large enough as to noticeably enhance indirect detection signals in GLAST and other detectors, by up to two orders of magnitude.
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