Abstract Although both early and late-time modifications of the ΛCDM model have been proposed to address the Hubble tension, compelling arguments suggest that for a solution to be successful it needs to modify the expansion history of the universe prior to recombination. This greatly increases the importance of precise CMB observations, and in this letter we make the argument for CMB spectral distortions, highlighting their potential role in constraining models that introduce significant shifts in the standard ΛCDM parameters, such as the scalar spectral index, in attempt to solve the Hubble tension.

中文翻译：

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CMB 光谱畸变在哈勃张力中的作用：原理证明

摘要 虽然 ΛCDM 模型的早期和晚期修改都被提出来解决哈勃张力，但令人信服的论点表明，要使解决方案成功，它需要在重组之前修改宇宙的膨胀历史。这大大增加了精确 CMB 观测的重要性，在这封信中，我们提出了 CMB 光谱失真的论点，强调了它们在约束模型中的潜在作用，这些模型引入了标准 ΛCDM 参数（例如标量光谱指数）的显着变化，试图解决哈勃张力。