从暗能量调查数据的前三年来测量韦尔潜力的演变
Isaac Tutusaus1, Camille Bonvin2, Nastassia Grimm3
1Institut de Recherche en Astrophysique et Planétologie (IRAP), Université de Toulouse, CNRS, UPS, CNES, 14 Av. Edouard Belin, Toulouse, France. isaac.tutusaus@irap.omp.eu.
Nature communications
|November 11, 2024
概括
科学家用暗能量调查数据测量了韦尔潜力,这是一个关键的重力测试. 结果显示,与标准的兰巴达冷暗物质模型存在显著的紧张关系,特别是在较低的红移时.
科学领域:
- 宇宙学的宇宙学是什么?
- 引力物理 引力物理
- 天体物理测量 太空物理测量
背景情况:
- 韦尔电位探测宇宙的几何结构,为引力理论和兰巴达冷暗物质 (ΛCDM) 模型提供了直接测试.
- 宇宙学参数的差异,如 σ8,突出了当前模型的潜在问题.
研究的目的:
- 为了测量Weyl潜力,使用Dark Energy Survey (DES) 数据在不同的红移容器中测量Weyl潜力.
- 调查这些测量对 ΛCDM 模型和宇宙学参数中的张力的影响.
- 为测试替代引力理论提供韦尔潜力的模型独立测量.
主要方法:
- 利用了暗能量调查观测的前三年的数据.
- 在四个不同的红移容器中计算了韦尔电位.
- 进行了独立于模型的分析,以确保广泛适用.
主要成果:
- 测量的韦尔电位在两个最低的红移容器中发现低于 ΛCDM 预测的 2σ 和 2.8σ .
- 这些低的韦尔电位值解释了宇宙微波背景和关于σ8参数的弱透镜测量之间的紧张关系.
- 暗能量调查数据本身就表明人们更喜欢高原始波动和缓慢的韦尔潜能演化,独立于宇宙微波背景数据.
结论:
- 这项研究揭示了在韦尔电位测量中与 ΛCDM 模型的显著偏差,表明了标准宇宙学模型的潜在问题.
- 在宇宙学参数中观察到的张力,特别是 σ8,与这些低的韦尔电位值有关.
- 独立于模型的韦尔电位测量为测试超出广义相对论之外的重力理论提供了强大的工具.
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