Production of purely gravitational dark matter
Production of purely gravitational dark matter
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DOI：
10.1007/jhep09(2018)135
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发表时间：
2018-04
影响因子：
5.4
通讯作者：
Yohei Ema;K. Nakayama;Yong Tang
中科院分区：
文献类型：
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作者：
Yohei Ema;K. Nakayama;Yong Tang
在纯引力暗物质的情况下，暗物质粒子没有任何相互作用，除了引力。我们研究了暗物质粒子在这样一个最小设置中的引力粒子产生，并表明可以根据膨胀模型和暗物质质量产生正确数量的暗物质。特别地，我们仔细评估了从过渡时期到暴胀子振荡时期的粒子生产率在一个现实的暴胀模型，并指出，引力粒子的生产是有效的，即使暗物质的质量远远大于哈勃尺度在暴胀期间，只要它小于暴胀子质量。
In the purely gravitational dark matter scenario, the dark matter particle does not have any interaction except for gravitational one. We study the gravitational particle production of dark matter particle in such a minimal setup and show that correct amount of dark matter can be produced depending on the inflation model and the dark matter mass. In particular, we carefully evaluate the particle production rate from the transition epoch to the inflaton oscillation epoch in a realistic inflation model and point out that the gravitational particle production is efficient even if dark matter mass is much larger than the Hubble scale during inflation as long as it is smaller than the inflaton mass.