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arXiv 2307.00537hep-phastro-ph.CO
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暴胀引力波与WIMP暗物质在脉冲星计时阵列数据中的印记

Imprint of inflationary gravitational waves and WIMP dark matter in pulsar timing array data

Debasish Borah, Suruj Jyoti Das, Rome Samanta

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10 pages, 5 captioned figures, matches version accepted in JCAP
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AI总结：

本研究探讨在“无奇迹WIMP”暗物质情景下，利用暴胀蓝移引力波解释脉冲星计时阵列信号，通过晚期熵稀释解决暗物质过度产生与宇宙学观测冲突，并拟合NANOGrav数据。

摘要：

受最近五个不同的脉冲星计时阵列（PTA）实验发布的新结果所激励，这些实验声称发现了纳赫兹频率原初引力波（GW）的令人信服的证据，我们考虑了在一种名为“无奇迹WIMP”（Miracle-less WIMP）的特定暗物质（DM）情景中，从暴胀蓝移张量功率谱产生这种信号的前景。由于与标准模型（SM）热浴的相互作用率不足，“无奇迹WIMP”在热力学上被过度产生；而符合PTA数据的暴胀蓝移引力波（BGW），如果暴胀后的再加热温度足够高，则会与宇宙学观测相冲突。这两个问题都通过晚期熵稀释得到解决，使暗物质丰度进入观测限制范围内，并在BGW谱中产生一个双峰特征，与宇宙学观测一致。低频峰值的蓝移尾部可以拟合NANOGrav 15年数据，而谱的其他部分则在当前和未来引力波实验的可及范围内。

英文摘要：

Motivated by the recent release of new results from five different pulsar timing array (PTA) experiments claiming to have found compelling evidence for primordial gravitational waves (GW) at nano-Hz frequencies, we consider the prospects of generating such a signal from inflationary blue-tilted tensor power spectrum in a specific dark matter (DM) scenario dubbed as $\textit{Miracle-less WIMP}$. While $\textit{Miracle-less WIMP}$, due to insufficient interaction rate with the Standard Model (SM) bath gets thermally overproduced, inflationary blue-tilted gravitational waves (BGW) in compliance with PTA data, conflict cosmological observations if reheat temperature after inflation is sufficiently high. Both these issues are circumvented with late entropy dilution, bringing DM abundance within observational limits and creating a doubly-peaked feature in the BGW spectrum consistent with cosmological observations. The blue-tilted tail of the low-frequency peak can fit NANOGrav 15 yr data, while other parts of the spectrum are within reach of present and future GW experiments.

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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