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arXiv 2406.07533astro-ph.COhep-ph
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解读DESI 2024 BAO:晚期动态暗能量还是局部效应?

Interpreting DESI 2024 BAO: late-time dynamical dark energy or a local effect?

Ioannis D. Gialamas, Gert Hütsi, Kristjan Kannike, Antonio Racioppi, Martti Raidal, Martin Vasar, Hardi Veermäe

AI总结:

本研究通过拟合DESI、CMB和超新星数据,发现暗能量动态演化的提示主要由低红移超新星数据驱动,物理quintessence模型更受青睐,暗示要么宇宙近期发生剧变,要么存在局部系统学未解。

摘要:

我们对DESI、CMB和超新星数据进行拟合,以理解DESI暗能量动态演化提示的物理起源。我们发现,状态方程$w$的线性参数化可能导致误导性解释,例如对幻影宇宙的提示,而这些并不受数据青睐。相反,物理的quintessence模型能很好地拟合数据。从模型无关的角度看,当前观测仅在非常低的红移$z < \mathcal{O}(0.1)$处偏好偏离恒定暗能量$w=-1$。我们发现这一结果由低红移超新星数据驱动。因此,要么我们宇宙的基本属性(由状态方程$w$和哈勃参数$H$表征)在最近发生了剧烈变化,要么我们并未完全理解约$300\\,h^{-1}\rm Mpc$半径内局部宇宙的系统学。

英文摘要:

We perform fits to DESI, CMB and supernova data to understand the physical origin of the DESI hint for dynamical dark energy. We find that the linear parametrization of the equation of state $w$ may guide to misleading interpretations, such as the hint for a phantom Universe, which are not preferred by the data. Instead, physical quintessence models fit the data well. Model-independently, present observations prefer deviations from the constant dark energy, $w=-1$, only at very low redshifts, $z < \mathcal{O}(0.1)$. We find that this result is driven by low-$z$ supernova data. Therefore, either the fundamental properties of our Universe, characterised by the equation of state $w$ and the Hubble parameter $H$, underwent dramatic changes very recently or, alternatively, we do not fully understand the systematics of our local Universe in a radius of about $300\,h^{-1}\rm Mpc$.

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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