CMB constraints on late-universe decaying dark matter as a solution to the H0 tension
CMB constraints on late-universe decaying dark matter as a solution to the H0 tension
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发表时间：
2020
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通讯作者：
Steven J. Clark;Kyriakos Vattis;S. Koushiappas
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作者：
Steven J. Clark;Kyriakos Vattis;S. Koushiappas
有人认为，宇宙后期暗物质的衰变可以缓解局部宇宙中H0的测量值与从宇宙微波背景波动推断的H0值之间的紧张关系。衰变的暗物质可以潜在地解释这种差异，因为它重新调整了物质和辐射之间的能量密度，从而使暗能量在更早的时候成为主导。我们发现，宇宙微波背景各向异性功率谱的低多极振幅严重限制了后期衰变作为H0张力的解决方案的可行性。
It has been suggested that late-universe dark matter decays can alleviate the tension between measurements of H0 in the local universe and its value inferred from cosmic microwave background fluctuations. Decaying dark matter can potentially account for this discrepancy as it reshuffles the energy density between matter and radiation and as a result allows dark energy to become dominant at earlier times. We show that the low multipoles amplitude of the cosmic microwave background anisotropy power spectrum severely constrains the feasibility of late-time decays as a solution to the H0 tension.