Scalar-tensor cosmologies without screening

Scalar-tensor cosmologies without screening
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无需筛选的标量张量宇宙学

DOI:
10.1088/1475-7516/2021/01/045
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发表时间:
2021
影响因子:
6.4
通讯作者:
Noller J
Noller J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Noller J

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标量-张量理论通常只在存在屏蔽机制的情况下才与第五力约束一致,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Horndeski理论的哪些子集不会产生和/或需要这样的筛选机制。我们详细研究了这些子集,导出了它们的形式,并讨论了它们如何受到来自引力波速度、太阳系测试和宇宙学可观测数据的附加限制。最后,我们还确定了标量张量理论的哪些子集精确地恢复了准静态极限下标准的(线性化的)Λ清洁发展机制宇宙论的预测。
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) ΛCDM cosmologies in the quasi-static limit.
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期刊: Physical Review D
影响因子: 5
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