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arXiv 1808.02532astro-ph.COhep-ph
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高红移宇宙中无非重子冷暗物质宇宙中21厘米吸收信号天空平均深度的预测

Predictions for the sky-averaged depth of the 21cm absorption signal at high redshift in cosmologies with and without non-baryonic cold dark matter

Case Western Reserve University(凯斯西储大学)

Stacy McGaugh

AI总结:

研究预测高红移宇宙中无非重子冷暗物质时21厘米吸收信号比有暗物质时大约2倍,提示可能需要扩展引力理论替代暗物质解释。

摘要:

我们考虑了在有无非重子冷暗物质的宇宙中,高红移时期预期的21厘米吸收信号。早期宇宙的膨胀在存在暗物质时强烈减速,但没有暗物质时则近似保持恒定。这导致了吸收预期时期路径长度的不同,结果是吸收信号在没有暗物质时预测比有暗物质时大约2倍。观测到这样的信号将促使考虑替代暗物质的广义相对论扩展理论。

英文摘要:

We consider the 21cm absorption signal expected at high redshift in cosmologies with and without non-baryonic cold dark matter. The expansion of the early universe decelerates strongly with dark matter, but approximately coasts without it. This results in a different path length across the epochs when absorption is expected, with the consequence that the absorption is predicted to be a factor of $\sim 2$ greater without dark matter than with it. Observation of such a signal would motivate consideration of extended theories of gravity in lieu of dark matter.

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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