arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2107.13337hep-phastro-ph.HE
收藏

大额外维中的太阳轴子

Solar axions in large extra dimensions

Mar Bastero-Gil, Cyprien Beaufort, Daniel Santos

摘要:

轴子可以作为额外维度的探测器。在大的额外维中,除了QCD轴子之外,人们还得到了一个无限大的卡鲁扎-克莱因(KK)态。我们描述了通过轴子-光子耦合$g_{aγγ}$在太阳中产生KK轴子的过程,并推导出被捕获到太阳引力场中然后在宇宙时间内积累的KK轴子的数密度。态的大量多样性,以及它们在keV范围内的质量,深刻地改变了轴子的现象学。这种情况下,我们提出存在的KK轴子作为解释的非热分布的太阳X射线。在这项工作中,我们特别关注的天体物理学和宇宙学的界限,适用于该模型。特别是,我们展示了如何KK轴子可能逃脱EBL限制,限制标准的ALP在相同的质量范围。目前的搜索KK轴子利用衰变通道,$a\rightarrowγγ$,我们修改的事件率,我们的价值在于数量级低于通常引用的文献中的速率。这一重大结论源于最近对安静太阳亮度的测量,太阳的亮度充当了不可约的极限。修订后的模型仍然是一个可行的和有吸引力的解释多天体物理观测,我们提出了几种方法来寻找太阳KK轴子在不久的将来。

英文摘要:

The axion could be used as a probe for extra dimensions. In large extra dimensions, besides the QCD axion one obtains an infinite tower of massive Kaluza-Klein (KK) states. We describe the processes of KK axions production in the Sun via the axion-photon coupling, $g_{aγγ}$, and we derive the number density of KK axions that get trapped into the solar gravitational field and then accumulate over cosmic times. The large multiplicity of states, as well as their masses in the keV-range, deeply alter the phenomenology of the axion. This scenario leads us to propose the presence of KK axions as an interpretation of the non-thermal distribution of the solar X-rays. In this work, we dedicate special attention on the astrophysical and cosmological bounds that apply on the model. In particular, we show how the KK axions may escape the EBL limit that constrains standard ALPs in the same mass range. Present searches for KK axions make use of the decay channel, $a\rightarrowγγ$, for which we revise the event rate; our value lies orders of magnitude below the rate usually quoted in the literature. This major conclusion stems from recent measurements of the luminosity of the quiet Sun which acts as an irreducible limit. The revised model remains a viable and an attractive explanation for multiple astrophysical observations, and we propose several approaches to search for solar KK axions in the near future.

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。

↑