Scaling transformations and the origins of light relics constraints from cosmic microwave background observations

Scaling transformations and the origins of light relics constraints from cosmic microwave background observations
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宇宙微波背景观测的尺度变换和光遗迹约束的起源

DOI:
10.1103/physrevd.107.023517
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发表时间:
2023
期刊:
影响因子:
5
通讯作者:
Knox, Lloyd
Knox, Lloyd
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ge, Fei;Cyr-Racine, Francis-Yan;Knox, Lloyd

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在这里,我们使用一个家庭的缩放变换,缩放关键速率的演化方程,分析了解约束光遗物从宇宙微波背景(CMB)的地图,给定的宇宙模型的不同程度的复杂性。我们描述了物理效应的原因,这些物理效应对数据的约束能力至关重要,重点是最新颖的两个。我们使用一个宇宙学模型作为参考模型,该模型允许缩放变换,增加光遗迹能量密度,同时避免所有这些原因。在一个给定的模型中,对光遗迹的限制可以被理解为是由于给定模型和参考模型之间的差异,只要额外的光遗迹只与标准模型组件发生引力相互作用。这种理解支持宇宙学模型的发展,可以逃避光遗迹的CMB地图的限制。
We use here a family of scaling transformations, that scale key rates in the evolution equations, to analytically understand constraints on light relics from cosmic microwave background (CMB) maps, given cosmological models of varying degrees of complexity. We describe the causes of physical effects that are fundamentally important to the constraining power of the data, with a focus on the two that are most novel. We use as a reference model a cosmological model that admits a scaling transformation that increases light relic energy density while avoiding all of these causes. Constraints on light relics in a given model can then be understood as due to the differences between the given model and the reference model, as long as the additional light relics only interact gravitationally with the Standard Model components. This understanding supports the development of cosmological models that can evade light relics constraints from CMB maps.
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