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arXiv 2204.08484astro-ph.COhep-ph
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利用线性宇宙学揭示暗第五种力

Unveiling dark fifth forces with linear cosmology

Maria Archidiacono, Emanuele Castorina, Diego Redigolo, Ennio Salvioni

AI总结:

本研究针对仅作用于暗物质的暗第五种力,通过线性宇宙学框架分析其背景与扰动演化效应,结合CMB和BAO数据得到迄今最强的力强度约束,并探讨其对哈勃张力等问题的意义。

摘要:

我们开启了对暗第五种力宇宙学效应的探索:这类新作用力仅作用于暗物质。我们重点关注长程相互作用,这类相互作用会在当前宇宙学尺度上导致等效原理的有效破缺。在微观层面,暗第五种力可通过质量小于当前哈勃常数(≲10⁻³³ eV)、与暗物质耦合的轻标量粒子实现。我们研究了这类宇宙中背景宇宙学与线性扰动的演化行为:在背景层面,新作用力会改变暗物质能量密度的演化,进而改变哈勃流;在线性阶,它会修改物质扰动的增长,产生暗物质与重子之间随时间增长的相对密度扰动和速度扰动。我们利用当前CMB(宇宙微波背景)和BAO(重子声学振荡)数据推导约束,将暗第五种力的强度上限限定为引力强度的百分之一以下,这是迄今为止得到的最强约束。我们展示了该场景对哈勃张力的潜在影响,讨论了当轻标量媒介子贡献观测到的暗能量密度时我们的结果会如何修正,最后评述了我们得到的约束与可见 sector 中等效原理破缺搜寻工作之间的相互影响。

英文摘要:

We initiate the exploration of the cosmology of dark fifth forces: new forces acting solely on Dark Matter. We focus on long range interactions which lead to an effective violation of the Equivalence Principle on cosmological scales today. At the microscopic level, the dark fifth force can be realized by a light scalar with mass smaller than the Hubble constant today ($\lesssim 10^{-33}\,\text{eV}$) coupled to Dark Matter. We study the behavior of the background cosmology and linear perturbations in such a Universe. At the background level, the new force modifies the evolution of the Dark Matter energy density and thus the Hubble flow. At linear order, it modifies the growth of matter perturbations and generates relative density and velocity perturbations between Dark Matter and baryons that grow over time. We derive constraints from current CMB and BAO data, bounding the strength of the dark fifth force to be less than a percent of gravity. These are the strongest constraints to date. We present potential implications of this scenario for the Hubble tension and discuss how our results are modified if the light scalar mediator accounts for the observed density of the Dark Energy. Finally, we comment on the interplay between our constraints and searches for violations of the Equivalence Principle in the visible sector.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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