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arXiv 2501.03444astro-ph.COgr-qchep-th
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源自暴胀量子涨落的暗物质

Dark matter from inflationary quantum fluctuations

Mohammad Ali Gorji, Misao Sasaki, Teruaki Suyama

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23+9 pages, 3 figures, matches published version
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AI总结：

研究暗物质仅源于暴胀量子涨落的情景，推导辐射主导期场扰动的精确转移函数，确定可行参数空间，并预测高红移处大量形成亚太阳质量暗物质晕。

摘要：

我们探讨了一种暗物质是质量玻色子场的情景，其仅产生于暴胀期间生成的量子涨落。在此框架下，暗物质在小尺度上展现出幅度为 ${\cal O}(1)$ 的原初等曲率扰动，这超出了当前观测（如 CMB 和大尺度结构观测）的探测范围。我们推导了辐射主导时期暗物质场扰动的精确转移函数。基于此结果，我们还在某些极限情况下推导了转移函数的近似表达式，并确认精确转移函数能够复现已知行为。假设初始功率谱为单色，我们利用转移函数确定了由暗物质质量和扰动长度尺度定义的可行参数空间。该情景的一个关键预测是，在高红移处会大量形成亚太阳质量暗物质晕。对大量此类低质量晕的观测确认，将支持暗物质纯粹源于暴胀量子涨落的假说。

英文摘要：

We explore a scenario in which dark matter is a massive bosonic field, arising solely from quantum fluctuations generated during inflation. In this framework, dark matter exhibits primordial isocurvature perturbations with an amplitude of ${\cal O}(1)$ at small scales that are beyond the reach of current observations such as those from the CMB and large-scale structure. We derive an exact transfer function for the dark matter field perturbations during the radiation dominated era. Based on this result, we also derive approximate expressions of the transfer function in some limiting cases where we confirm that the exact transfer function reproduces known behaviors. Assuming a monochromatic initial power spectrum, we use the transfer function to identify the viable parameter space defined by the dark matter mass and the length scale of perturbations. A key prediction of this scenario is copious formation of subsolar mass dark matter halos at high redshifts. Observational confirmation of a large population of such low-mass halos will support for the hypothesis that dark matter originated purely from inflationary quantum fluctuations.

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。

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