arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.12145hep-ph
收藏

滚动暴胀子产生的暗光子暗物质

Dark photon dark matter from a rolling inflaton

Universidad de Granada(格拉纳达大学);SISSA(的里雅斯特高等研究学校);INFN Sezione di Trieste(意大利国家核物理研究所的里雅斯特分部);Institute for Fundamental Physics of the Universe(宇宙基础物理研究所)

Mar Bastero-Gil, Jose Santiago, Lorenzo Ubaldi, Roberto Vega-Morales

AI总结:

该研究提出滚动暴胀子的快子不稳定性可产生非热暗光子暗物质,其功率谱峰值对应当前厘米至百公里尺度,具有团块状性质,还探讨了相关现象学与未来方向。

摘要:

我们详细研究了一种近期提出的机制,该机制用于在暴胀结束时产生质量范围为μ eV ≤ m ≤ 10 TeV的非热暗光子暗物质。滚动暴胀子诱导的快子不稳定性导致暗阿贝尔规范玻色子的相干产生,其功率谱的峰值对应暴胀结束时的哈勃尺度。暴胀后宇宙膨胀过程中,暗光子发生红移,在其宇宙演化的某个时刻获得质量。我们特别关注暗光子质量产生时仍处于相对论性的情况,研究相关宇宙演化以计算其当前的残余丰度,同时研究后期功率谱,明确证明其保留了暴胀结束时产生的峰值。我们表明,该峰值对应当前的物理小尺度,ℓ_today ~ cm - 100 km,ℓ_today处的大密度波动使暗光子暗物质具有团块状性质。我们还讨论了潜在的现象学和未来方向,并简要评述了非相对论性情况。

英文摘要:

We study in detail a recently proposed mechanism for producing non-thermal dark photon dark matter at the end of inflation in the mass range $μ\,{\rm eV} \lesssim m \lesssim 10\,{\rm TeV}$. A tachyonic instability induced by a rolling inflaton leads to the coherent production of dark (abelian) gauge bosons with a peak in the power spectrum corresponding to the Hubble scale at the end of inflation. As the Universe expands after inflation the dark photons redshift and, at some point in their cosmic evolution, they obtain a mass. We focus in particular on the case where the dark photons are relativistic at the time their mass is generated and examine the associated cosmic evolution to compute the relic abundance today. We also examine the late time power spectrum demonstrating explicitly that it preserves the peak generated at the end of inflation. We show that the peak corresponds to small physical scales today, $\ell_{\rm today} \sim {\rm cm} - 100\,{\rm km}$, with large density fluctuations at $\ell_{\rm today}$ leading to a clumpy nature for the dark photon dark matter. We also discuss potential phenomenology and future directions, briefly commenting on the non-relativistic case.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑