Superweakly interacting massive particle dark matter signals from the early Universe
Superweakly interacting massive particle dark matter signals from the early Universe
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DOI：
10.1103/physrevd.68.063504
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发表时间：
2003-09-15
影响因子：
5
通讯作者：
Takayama, F
中科院分区：
文献类型：
--
作者：
Feng, JL;Rajaraman, A;Takayama, F
冷暗物质可能是由超弱相互作用的大质量粒子--超WIMP粒子组成的，这些粒子自然地继承了亚稳态WIMP粒子晚期衰变所需的遗迹密度。动机良好的例子是超引力中的弱尺度引力子和来自额外维度的Kaluza-Klein引力子。这些粒子在所有暗物质实验中都是不可能被探测到的。然而，我们发现，超WIMP暗物质可能是通过早期宇宙的宇宙学特征来发现的。特别是，超WIMP暗物质对大爆炸核合成和宇宙微波背景(CMB)具有可观察到的后果，并可能解释观测到的Li-7丰度不足，而不会扰乱氘和CMB重力计之间的一致性。我们讨论了CMB黑体扭曲和对撞机寻找新粒子的未来探测的意义。在本研究过程中，我们还结合Wilkinson微波各向异性探测数据，对晚衰粒子的熵产生进行了独立于模型的分析。
Cold dark matter may be made of superweakly interacting massive particles, super-WIMP's, that naturally inherit the desired relic density from late decays of metastable WIMP's. Well-motivated examples are weak-scale gravitinos in supergravity and Kaluza-Klein gravitons from extra dimensions. These particles are impossible to detect in all dark matter experiments. We find, however, that super-WIMP dark matter may be discovered through cosmological signatures from the early Universe. In particular, super-WIMP dark matter has observable consequences for big bang nucleosynthesis and the cosmic microwave background (CMB), and may explain the observed underabundance of Li-7 without upsetting the concordance between deuterium and CMB baryometers. We discuss the implications for future probes of CMB blackbody distortions and collider searches for new particles. In the course of this study, we also present a model-independent analysis of entropy production from late-decaying particles in light of Wilkinson microwave anisotropy probe data.