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arXiv 2310.03092astro-ph.COgr-qchep-th
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理论先验与暗能量状态方程

Theoretical Priors and the Dark Energy Equation of State

Ido Ben-Dayan, Utkarsh Kumar

AI总结:

本文重新审视了用于推断暗能量参数的理论先验,构建了一个考虑 tracker 机制的模型无关参数化,允许辐射/物质到暗能量行为的突然过渡,发现优选过渡红移为 $1+z\simeq 29-30$,并减弱了 Hubble 和 Large Scale Structure 张力。

摘要:

我们重新审视了用于推断 Dark Energy (DE) 参数的理论先验。任何 DE 模型都必须具有某种形式的 tracker 机制,使其在过去表现为物质或辐射。否则,该模型就是微调的。我们构建了一个考虑该先验的模型无关参数化,并允许在辐射/物质到 DE 行为之间发生相对突然的过渡。我们将该参数化与当前数据进行匹配,并推断出 DE 的绝热声速和有效声速在推断宇宙学参数中起着重要作用。我们发现存在一个优选的过渡红移 $1+z\simeq 29-30$,并且 Hubble 和 Large Scale Structure 张力有所减弱。

英文摘要:

We revisit the theoretical priors used for inferring Dark Energy (DE) parameters. Any DE model must have some form of a tracker mechanism such that it behaved as matter or radiation in the past. Otherwise, the model is fine-tuned. We construct a model-independent parametrization that takes this prior into account and allows for a relatively sudden transition between radiation/matter to DE behavior. We match the parametrization with current data, and deduce that the adiabatic and effective sound speeds of DE play an important role in inferring the cosmological parameters. We find that there is a preferred transition redshift of $1+z\simeq 29-30$, and some reduction in the Hubble and Large Scale Structure tensions.

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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