Microphysics of early dark energy

被引：20

作者：

Sabla, Vivian, I ^{[1
]}

Caldwell, Robert R. ^{[1
]}

机构：

[1] Dartmouth Coll, Dept Phys & Astron, HB 6127 Wilder Lab, Hanover, NH 03755 USA

来源：

PHYSICAL REVIEW D | 2022年 / 106卷 / 06期

关键词：

ANISOTROPIES; OSCILLATIONS; SCALAR;

D O I：

10.1103/PhysRevD.106.063526

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

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 4 sigma level, and thereby test whether a scalar field or some richer physics is at work.

引用

页数：28

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