Gauss-Bonnet braneworld cosmological effect on relic density of dark matter
Gauss-Bonnet braneworld cosmological effect on relic density of dark matter
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DOI：
10.1103/physrevd.79.103528
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发表时间：
2009-03
影响因子：
5
通讯作者：
N. Okada;S. Okada
中科院分区：
文献类型：
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作者：
N. Okada;S. Okada
在Gauss-Bonnet膜世界宇宙学中，我们在3-膜上的四维宇宙的弗里德曼方程在高能区（Gauss-Bonnet区）被修改，而标准膨胀定律在低能区（标准区）被再现。我们研究了在Gauss-Bonnet区发生暗物质冻结时，Gauss-Bonnet膜世界宇宙学效应对冷暗物质热遗迹密度的影响。我们发现，所得到的遗物密度显着降低时的转变温度，连接高斯-博内制度与标准制度，是足够低的。这一结果与先前在兰德尔-桑德拉姆膜世界宇宙学中得到的结果形成鲜明对比，在膜世界宇宙学中，遗迹密度被增强了。
In Gauss-Bonnet braneworld cosmology, the Friedmann equation of our four-dimensional Universe on 3-brane is modified in a high energy regime (Gauss-Bonnet regime), while the standard expansion law is reproduced in low energies (standard regime). We investigate the Gauss-Bonnet braneworld cosmological effect on the thermal relic density of cold dark matter when the freeze-out of the dark matter occurs in the Gauss-Bonnet regime. We find that the resultant relic density is considerably reduced when the transition temperature, which connects the Gauss-Bonnet regime with the standard regime, is low enough. This result is in sharp contrast with the result previously obtained in the Randall-Sundrum braneworld cosmology, where the relic density is enhanced.