Starobinsky暴胀期间量子涨落产生的暗光子暗物质
Dark Photon Dark Matter from Quantum Fluctuations during Starobinsky Inflation
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中文总结 AI 辅助
本研究针对Starobinsky暴胀模型，计算暴胀期间量子涨落产生的暗光子暗物质的残留丰度，结合观测约束得出其质量需在5.6至7.4 μeV范围内。
中文摘要 AI 辅助
我们详细研究了暴胀期间量子涨落产生暗光子暗物质的场景，特别关注那些需要依赖暴胀子振幅的Weyl变换才能转换到爱因斯坦框架的暴胀模型。在这类模型中，暗光子纵模的动能函数在暴胀期间及之后都会发生变化，我们发现这种变化对暗光子的残留丰度有显著影响。作为代表性且具有重要现象学意义的例子，我们分析了Starobinsky暴胀模型，并对该模型中的暗光子残留丰度进行了精确计算。通过施加相关观测约束，我们发现，在本研究考虑的框架内，为了重现当前宇宙中观测到的暗物质密度，暗光子的质量必须处于5.6 < m < 7.4 μeV的范围内。
英文摘要
We present a detailed investigation of scenarios in which dark-photon dark matter is produced from quantum fluctuations during inflation. In particular, we focus on inflationary models that necessarily involve a Weyl transformation, dependent on the inflaton amplitude, in order to move to the Einstein frame. In such models, the kinetic function of the longitudinal mode of the dark photon varies throughout, and even after, the inflationary period. We show that this variation of the kinetic function has a substantial impact on the resulting relic abundance of dark photons. As a representative and phenomenologically important example, we analyze the Starobinsky inflation model, for which we perform an accurate computation of the relic dark-photon abundance. By imposing the relevant observational constraints, we find that, in order to reproduce the observed dark-matter density in the present Universe, the dark-photon mass must lie in the range $5.6 < m < 7.4\,μ\mathrm{eV}$ within the framework considered in this work.
发表机构
- The University of Tokyo（东京大学）
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