标题： 来自重引力子衰变的中性粒子暗物质 显示英文标题

标题： Neutralino Dark Matter from Heavy Gravitino Decay

摘要： 我们提出了一种中性微子冷暗物质非热产生的新情景，在这种情景中，标准热历史中轻的超对称粒子（LSPs）的过量产生问题被自然解决。 该机制需要一个重模场，它主要衰变为普通粒子，释放大量熵以稀释大爆炸后立即产生的引力子以及LSPs的热遗迹。 在衰变过程中也会产生大量引力子，这些引力子随后衰变为中性微子。 我们确定了参数空间中的区域，在这些区域中，通过引力子衰变产生的强子喷注不会破坏大爆炸核合成，从而获得所需的中性微子暗物质丰度。 在这种机制中获得的中性微子丰度不依赖于超粒子质量谱的细节，这与标准热丰度不同。 我们还简要提及了该情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.