Gravitino, axino, and Kaluza–Klein graviton warm and mixed dark matter and reionization
Gravitino, axino, and Kaluza–Klein graviton warm and mixed dark matter and reionization
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DOI：
10.1088/1475-7516/2006/07/010
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发表时间：
2005-08
影响因子：
6.4
通讯作者：
K. Jedamzik;M. Lemoine;G. Moultaka
中科院分区：
文献类型：
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作者：
K. Jedamzik;M. Lemoine;G. Moultaka
稳定粒子暗物质很可能起源于长寿命的遗迹粒子的衰变过程，最近在axino，gravitino和更高维的Kaluza-Klein（KK）引力子的情况下进行了广泛的研究。结果表明，在大部分可行的参数空间，这样的暗物质出现自然温暖/热或混合。特别是，衰变产生的引力子（KK引力子）只有在衰变粒子的质量在几TeV范围内时才被认为是冷的，除非衰变粒子和暗物质粒子几乎简并。这样的暗物质候选者因此受到许多宇宙学对温暖和混合暗物质的限制，例如来自宇宙适当再电离的限制，莱曼-α森林，以及星系团的丰度。结果表明，从早期的再电离时代的约束，如最近的观测表明，可能会限制这样的温暖/热的组件只贡献很小的一部分的暗物质。
Stable particle dark matter may well originate during the decay of long-lived relic particles, as recently extensively examined in the cases of the axino, gravitino, and higher dimensional Kaluza–Klein (KK) graviton. It is shown that in much of the viable parameter space such dark matter emerges naturally warm/hot or mixed. In particular, decay produced gravitinos (KK gravitons) may only be considered cold for the mass of the decaying particle in the several TeV range, unless the decaying particle and the dark matter particle are almost degenerate. Such dark matter candidates are thus subject to a host of cosmological constraints on warm and mixed dark matter, such as limits from a proper reionization of the Universe, the Lyman-α forest, and the abundance of clusters of galaxies. It is shown that constraints from an early reionization epoch, such as are indicated by recent observations, may potentially limit such warm/hot components to contributing only a very small fraction to the dark matter.