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arXiv 2202.08291astro-ph.COgr-qchep-ph
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早期暗能量的微观物理学

Microphysics of Early Dark Energy

Vivian I. Sabla, Robert R. Caldwell

摘要:

早期的暗能量(EDE)依赖于标量场动力学来解决哈勃张力,通过提高复合前的长度尺度,从而提高CMB推断的哈勃常数值,使其与晚期宇宙探测器一致。然而,标量场微观物理对线性微扰谱的附带影响似乎排除了完全令人满意的解决方案。$H_0$是不提高,而不包括后期宇宙前,和“$S_8$ -张力”,早期和后期宇宙测量的结构生长参数之间的差异,加剧。如果EDE不是一个标量场呢?在这里,我们调查是否不同的微观物理,编码的压力和能量密度波动之间的本构关系,可以缓解这些紧张局势。我们表明,EDE与各向异性的声速可以软化的$H_0$和$S_8$的紧张局势,同时仍然提供了一个质量适合CMB数据。CMB-S4实验的未来观测可能能够在$4σ$水平上区分潜在的微观物理,从而测试是否有标量场或更丰富的物理在起作用。

英文摘要:

Early Dark Energy (EDE) relies on scalar field dynamics to resolve the Hubble tension, by boosting the pre-recombination length scales and thereby raising the CMB-inferred value of the Hubble constant into agreement with late universe probes. However, the collateral effect of scalar field microphysics on the linear perturbation spectra appears to preclude a fully satisfactory solution. $H_0$ is not raised without the inclusion of a late universe prior, and the "$S_8$-tension", a discrepancy between early- and late-universe measurements of the structure growth parameter, is exacerbated. What if EDE is not a scalar field? Here, we investigate whether different microphysics, encoded in the constitutive relationships between pressure and energy density fluctuations, can relieve these tensions. We show that EDE with an anisotropic sound speed can soften both the $H_0$ and $S_8$ tensions while still providing a quality fit to CMB data. Future observations from the CMB-S4 experiment may be able to distinguish the underlying microphysics at the $4σ$ level, and thereby test whether a scalar field or some richer physics is at work.

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