Graviton cosmology in universal extra dimensions
Graviton cosmology in universal extra dimensions
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通用额外维度中的引力子宇宙学
DOI：
10.1103/physrevd.68.085018
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发表时间：
2003
影响因子：
5
通讯作者：
F. Takayama
中科院分区：
文献类型：
--
作者：
Jonathan L. Feng;A. Rajaraman;F. Takayama
在普遍额外维度的模型中，引力和所有标准模型场都在额外维度中传播。先前对这类模型的研究主要集中在标准模型粒子的Kaluza-Klein （KK）伴子上。在这里，我们确定了KK引力子的性质，并探索了它们的宇宙学意义。我们发现了KK引力子衰变的寿命，与KK引力子作为暗物质的生存能力有关。然后我们讨论了再加热后KK引力子的原始产生。KK重子态塔的存在使得这种生产非常有效：对于再热温度T_RH和d个额外维度，重子尺度中存储的能量密度为T_RH^{2+3d/2}。因此，在所有普遍的额外维度情况下，过闭和大爆炸核合成严格限制T_RH。与此同时，存在一个足够低的再加热温度窗口，以避免这些限制，并足够高，以产生所需的KK WIMP和超级WIMP暗物质的热遗迹密度。
In models of universal extra dimensions, gravity and all standard model fields propagate in the extra dimensions. Previous studies of such models have concentrated on the Kaluza-Klein (KK) partners of standard model particles. Here we determine the properties of the KK gravitons and explore their cosmological implications. We find the lifetimes of decays to KK gravitons, of relevance for the viability of KK gravitons as dark matter. We then discuss the primordial production of KK gravitons after reheating. The existence of a tower of KK graviton states makes such production extremely efficient: for reheat temperature T_RH and d extra dimensions, the energy density stored in gravitons scales as T_RH^{2+3d/2}. Overclosure and Big Bang nucleosynthesis therefore stringently constrain T_RH in all universal extra dimension scenarios. At the same time, there is a window of reheat temperatures low enough to avoid these constraints and high enough to generate the desired thermal relic density for KK WIMP and superWIMP dark matter.
DOI：
10.1098/rspa.1939.0140
发表时间：
1939-11-01
影响因子：
--
作者：
Fierz, M;Pauli, W
通讯作者：
Pauli, W