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arXiv 2104.14889astro-ph.COgr-qc
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耦合暗能量的简单参数化

A simple parametrisation for coupled dark energy

Vitor da Fonseca, Tiago Barreiro, Nelson J. Nunes

摘要:

作为一种替代流行的参数化的暗能量状态方程,我们构建了一个quintessence模型的标量场的e-折叠的数量有一个线性依赖。对更复杂模型的约束通常受到随参数数量增加的退化的限制。所提出的参数化方便地限制了暗能量状态方程的演化,因为它允许各种各样的时间演化。我们还考虑了与冷暗物质的非最小耦合。我们用普朗克和KiDS观测数据拟合了模型。宇宙微波背景有利于能量从暗能量转移到暗物质的非零耦合。相反,引力弱透镜测量稍微有利于能量从暗物质转移到暗能量,暗能量状态方程从-1大幅偏离。

英文摘要:

As an alternative to the popular parametrisations of the dark energy equation of state, we construct a quintessence model where the scalar field has a linear dependence on the number of e-folds. Constraints on more complex models are typically limited by the degeneracies that increase with the number of parameters. The proposed parametrisation conveniently constrains the evolution of the dark energy equation of state as it allows for a wide variety of time evolutions. We also consider a non-minimal coupling to cold dark matter. We fit the model with Planck and KiDS observational data. The CMB favours a non-vanishing coupling with energy transfer from dark energy to dark matter. Conversely, gravitational weak lensing measurements slightly favour energy transfer from dark matter to dark energy, with a substantial departure of the dark energy equation of state from -1.

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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