arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1404.0680astro-ph.COhep-exhep-ph
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宇宙遗迹中微子的周年调制

Annual Modulation of Cosmic Relic Neutrinos

Benjamin R. Safdi, Mariangela Lisanti, Joshua Spitz, Joseph A. Formaggio

摘要:

宇宙中微子背景(CvB)在大爆炸后约一秒产生,渗透到今天的宇宙中。新的技术进步使得中微子在β衰变核(NCB)上的捕获成为探测CvB的明确途径。我们表明,太阳引力聚焦导致预期的中微子捕获率每年调制。调制的幅度和相位依赖于局部中微子背景的相空间分布,这是由结构形成扰动。这些结果也适用于在NCB实验中寻找不育中微子。引力聚焦是中微子捕获实验的唯一调制源,与暗物质直接探测搜索相反,在暗物质直接探测搜索中,地球相对于太阳的随时间变化的速度也起着作用。

英文摘要:

The cosmic neutrino background (CvB), produced about one second after the Big Bang, permeates the Universe today. New technological advancements make neutrino capture on beta-decaying nuclei (NCB) a clear path forward towards the detection of the CvB. We show that gravitational focusing by the Sun causes the expected neutrino capture rate to modulate annually. The amplitude and phase of the modulation depend on the phase-space distribution of the local neutrino background, which is perturbed by structure formation. These results also apply to searches for sterile neutrinos at NCB experiments. Gravitational focusing is the only source of modulation for neutrino capture experiments, in contrast to dark-matter direct-detection searches where the Earth's time-dependent velocity relative to the Sun also plays a role.

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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