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arXiv 2004.14661astro-ph.CO
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关于重子-暗能量弹性耦合的宇宙学特征

On cosmological signatures of baryons-dark energy elastic couplings

Jose Beltrán Jiménez, Dario Bettoni, David Figueruelo, Florencia A. Teppa Pannia

摘要:

我们考虑了一个暗能量和重子在没有任何能量转移的情况下动态耦合的情况。在这种情况下,背景宇宙学是不受影响的,在微扰水平,耦合只出现通过相应的暗能量和重子的欧拉方程。然后,我们探讨了这种情况下的一些现象学后果和他们的签名在几个宇宙学观测。特别是,我们展示了它抑制宇宙结构生长的能力。我们还约束模型的参数与宇宙学数据,并表明,暗能量与重子的相互作用在宇宙学尺度上是温和的青睐。

英文摘要:

We consider a scenario where dark energy and baryons are dynamically coupled without any energy transfer. In this scenario, the background cosmology is unaffected and, at the perturbations level, the coupling only appears through the corresponding Euler equations of dark energy and baryons. We then explore some phenomenological consequences of this scenario and their signatures in several cosmological observables. In particular, we show its ability to suppress the growth of cosmic structures. We also constrain the parameters of the model with cosmological data and show that an interaction of dark energy with baryons on cosmological scales is mildly favoured.

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