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arXiv 2602.13384astro-ph.COhep-ph
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原子暗物质领域的共振转换对宇宙微波背景谱畸变的影响

CMB Spectral Distortions from Resonant Conversions in Atomic Dark Sectors

C.N. Yang Institute for Theoretical Physics, Stony Brook University(杨振宁理论物理研究所,石溪大学);Center for Theoretical Physics - A Leinweber Institute, Massachusetts Institute of Technology(麻省理工学院莱因韦伯理论物理中心);Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology(麻省理工学院卡夫利天体物理学与空间研究研究所)

Duncan K. Adams, Jared Barron, Bryce Cyr, Xiuyuan Zhang

AI总结:

研究通过共振转换分析原子暗物质对宇宙微波背景谱畸变的影响,发现其能排除参数空间中的新区域,并为探测超低暗电荷区域提供新途径。

摘要:

由原子构成的暗物质领域为标准模型提供了有说服力的扩展,同时为现象学研究提供了多种途径。在本工作中,我们探讨了在原初宇宙微波背景谱畸变时期(10^3 ≲ z ≲ 10^6)暗物质与标准模型光子之间的转换影响。当两种光子物种的诱导热质量相等时,这些转换会因共振增强,从而导致可能产生显著的畸变。为此,我们通过在早期时间求解玻尔兹曼方程来确定暗光子的(不可约)冻结进或冻结出丰度。这一过程也使我们能够利用ACT DR6对通用毫电荷暗物质领域的限制进行更新,使用有效辐射自由度(N_eff)的数量限制。随后,通过建模两个领域中热质量的演变,我们利用兰道-泽纳尔正式主义计算了原初宇宙微波背景畸变。我们发现,当暗电子和质子质量大致相似(正电子对极限)时,COBE/FIRAS仪器的当前谱畸变数据能够排除参数空间中的新区域。我们还预测了由提议的FOSSIL卫星得出的限制,发现谱畸变也可以用于探测难以通过其他方法研究的超低暗电荷参数空间区域。

英文摘要:

Dark sectors consisting of atomic constituents (electrons, protons, and photons) offer a well-motivated extension to the Standard Model while providing multiple avenues for phenomenological study. In this work, we explore the impact of conversions between the dark and Standard Model photons in the primordial CMB spectral distortion epoch ($10^3 \lesssim z \lesssim 10^6$). These conversions are resonantly enhanced when the induced thermal masses of both photonic species are equal, thus leading to the possibility that sizeable distortions can be produced. To this end, we solve the Boltzmann equation at early times to determine the (irreducible) freeze-in or freeze-out abundance of dark photons. This procedure also allows us to update the limits on generic milli-charged dark sectors using the ACT DR6 bound on the number of effective radiative degrees of freedom ($N_{\rm eff}$). By then modeling the evolution of the thermal masses in both sectors, we compute the primordial CMB distortion using the Landau-Zener formalism. We find that when the dark electron and proton are roughly similar in mass (the positronium limit), current spectral distortion data from the COBE/FIRAS instrument is able to rule out novel regions of parameter space. We also forecast bounds from the proposed FOSSIL satellite, finding that spectral distortions can also be used to probe the ultra-low dark electric charge regions of parameter space, which are difficult to investigate by other means.

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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