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Signatures of a Hidden Cosmic Microwave Background

机译:隐藏的宇宙微波背景的签名

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摘要

If there is a light Abelian gauge boson γ' in the hidden sector its kinetic mixing with the photon can produce a hidden cosmic microwave background (HCMB). For meV masses, resonant oscillations γ reversible γ' happen after big bang nucleosynthesis (BBN) but before CMB decoupling, increasing the effective number of neutrinos N_v~(eff) and the baryon to photon ratio, and distorting the CMB blackbody spectrum. The agreement between BBN and CMB data provides new constraints. However, including Lyman-α data, N_v~(eff) > 3 is preferred. It is tempting to attribute this effect to the HCMB. The interesting parameter range will be tested in upcoming laboratory experiments.
机译:如果在隐藏区域中存在浅的阿贝尔规玻色子γ',则其与光子的动态混合会产生隐藏的宇宙微波背景(HCMB)。对于meV质量而言,大爆炸核合成(BBN)之后但CMB解耦之前发生共振振荡γ可逆γ',从而增加了中微子的有效数量N_v〜(eff)和重子与光子的比率,并使CMB黑体光谱失真。 BBN和CMB数据之间的协议提供了新的约束。然而,包括Lyman-α数据,N_v_(eff)> 3是优选的。试图将这种影响归因于HCMB。有趣的参数范围将在即将进行的实验室实验中进行测试。

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