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Scalar-tensor cosmologies without screening
Journal of Cosmology and Astroparticle Physics ( IF 6.4 ) Pub Date : 2021-01-22 , DOI: 10.1088/1475-7516/2021/01/045
Johannes Noller 1, 2, 3 , Luca Santoni 4 , Enrico Trincherini 5, 6 , Leonardo G. Trombetta 5, 6
Affiliation  

Scalar-tensor theories are frequently only consistent with fifth force constraints in the presence of a screening mechanism, namely in order to suppress an otherwise unacceptably large coupling between the scalar and ordinary matter. Here we investigate precisely which subsets of Horndeski theories do not give rise to and/or require such a screening mechanism. We investigate these subsets in detail, deriving their form and discussing how they are restricted upon imposing additional bounds from the speed of gravitational waves, solar system tests and cosmological observables. Finally, we also identify what subsets of scalar-tensor theories precisely recover the predictions of standard (linearised) $\Lambda\text{CDM}$ cosmologies in the quasi-static limit.

中文翻译:

无需筛选的标量张量宇宙学

标量张量理论通常只与存在筛选机制的第五力约束一致,即为了抑制标量和普通物质之间不可接受的大耦合。在这里,我们精确地调查了 Horndeski 理论的哪些子集不会产生和/或不需要这种筛选机制。我们详细研究了这些子集,推导出它们的形式,并讨论了它们如何受到引力波速度、太阳系测试和宇宙学可观测量的额外限制的限制。最后,我们还确定了标量张量理论的哪些子集在准静态极限中精确地恢复了标准(线性化)$\Lambda\text{CDM}$ 宇宙学的预测。
更新日期:2021-01-22
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