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arXiv 2404.06396astro-ph.COgr-qc
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弥合S8:相互作用暗物质领域的见解

Reconciling $S_8$: Insights from Interacting Dark Sectors

Indian Statistical Institute(印度统计研究所);Jamia Millia Islamia(贾米亚米利伊斯兰大学)

Rahul Shah, Purba Mukherjee, Supratik Pal

AI总结:

本文研究暗能量与冷暗物质相互作用缓解S8聚类张力的前景,通过分析不同暗能量方程状态参数化及扰动,发现交互项与σ8,0的负相关性可降低S8张力,但非幻影区域张力恶化,强调幻影暗能量的重要性。

摘要:

本文详细研究了暗能量与冷暗物质相互作用在缓解S8聚类张力方面的前景。通过分析不同暗能量方程状态参数化及扰动,发现交互项与σ8,0的负相关性可降低S8张力,但非幻影区域张力恶化,强调幻影暗能量的重要性。利用宇宙微波背景(CMB)、声学振荡和Ia型超新星数据集,获得了模型参数的约束,并观察到H0-σ8,0相关性的普遍降低,无论暗能量方程状态是常数还是动态的。这种降低,结合交互项与σ8,0的显著负相关性,有助于通过将σ8,0降低到早期CMB和晚期聚类测量之间来缓解聚类张力。此外,这种效果并未加剧哈勃张力。在这方面,相互作用的Chevallier-Polarski-Linder和Jassal-Bagla-Padmanabhan模型在缓解S8张力到<1σ方面表现最佳。然而,在非幻影区域,σ8,0张力趋于恶化,这再次证明了幻影暗能量在最新数据中的优势。我们进一步研究了红移空间扭曲数据集的作用,并发现总体张力有所降低,σ8,0值相对更接近CMB值。最后,我们检查了进一步扩展此情景,如包括暗能量声速和冷暗物质与暗能量相互作用,是否会产生影响。

英文摘要:

We do a careful investigation of the prospects of dark energy (DE) interacting with cold dark matter in alleviating the $S_8$ clustering tension. To this end, we consider various well-known parametrizations of the DE equation of state (EoS) and consider perturbations in both the dark sectors, along with an interaction term. Moreover, we perform a separate study for the phantom and non-phantom regimes. Using cosmic microwave background (CMB), baryon acoustic oscillations, and Type Ia supernovae data sets, constraints on the model parameters for each case have been obtained and a generic reduction in the $H_0-σ_{8,0}$ correlation has been observed, both for constant and dynamical DE EoS. This reduction, coupled with a significant negative correlation between the interaction term and $σ_{8,0}$, contributes to easing the clustering tension by lowering $σ_{8,0}$ to somewhere in between the early CMB and late-time clustering measurements for the phantom regime, for almost all the models under consideration. Additionally, this is achieved without exacerbating the Hubble tension. In this regard, the interacting Chevallier-Polarski-Linder and Jassal-Bagla-Padmanabhan models perform the best in relaxing the $S_8$ tension to $<1σ$. However, for the non-phantom regime the $σ_{8,0}$ tension tends to have worsened, which reassures the merits of phantom DE from latest data. We further investigate the role of redshift space distortion data sets and find an overall reduction in tension, with a $σ_{8,0}$ value relatively closer to the CMB value. We finally check whether further extensions of this scenario, such as the inclusion of the sound speed of DE and warm dark matter interacting with DE, can have some effects.

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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