标题： 中性子暗物质来自重引力子衰变 显示英文标题

标题： Neutralino Dark Matter from Heavy Gravitino Decay

摘要： 我们提出了一种新的中性子冷暗物质非热产生场景，在这一场景中，标准热历史中轻est超对称粒子（LSP）的过多产生问题得到了自然解决。 该机制需要一个主要衰变为普通粒子的重模标场，从而释放大量熵来稀释暴胀后产生的引力子和LSP的热遗迹。 在衰变过程中还会显著地成对产生大量的引力子，这些引力子随后会衰变为中性子。 我们确定了参数空间的区域，在这些区域内可以通过这种机制获得所需的中性子暗物质丰度，而不会因注入由引力子衰变产生的强子喷流而破坏大爆炸核合成。 与标准热丰度不同，这种机制下得到的中性子丰度对超粒子质量谱的细节不敏感。 我们还简要讨论了该场景在未来实验中的可检验性。 显示英文摘要

摘要： We propose a new scenario of non-thermal production of neutralino cold dark matter, in which the overproduction problem of lightest supersymmetric particles (LSPs) in the standard thermal history is naturally solved. The mechanism requires a heavy modulus field which decays mainly to ordinary particles releasing large entropy to dilute gravitinos produced just after inflation and thermal relics of LSPs. Significant amount of gravitinos are also pair-produced at the decay, which subsequently decay into the neutralinos. We identify the regions of the parameter space in which the requisite abundance of the neutralino dark matter is obtained without spoiling the big-bang nucleosynthesis by injection of hadronic showers from gravitino decay. The neutralino abundance obtained in this mechanism is insensitive to the details of the superparticle mass spectrum, unlike the standard thermal abundance. We also briefly mention the testability of the scenario in future experiments.