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在一致性宇宙学模型中,抑制结构增长的证据
Nhat-Minh Nguyen1, Dragan Huterer1, Yuewei Wen1
1Leinweber Center for Theoretical Physics, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109-1040, USA and Department of Physics, College of Literature, Science and the Arts, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109-1040, USA.
宇宙学数据表明大规模结构的增长被抑制,有利于比一般相对论预测的更高的"增长指数" (γ). 这一发现挑战了标准的兰巴达冷暗物质模型,并有助于解决物质波动测量中的紧张关系.
科学领域:
- 宇宙学的宇宙学是什么?
- 天体物理学 天体物理学
- 大规模结构的形成大规模结构的形成
背景情况:
- 标准的兰巴达冷暗物质 (ΛCDM) 模型预测宇宙结构的特定增长率.
- 对物质波动幅度 (S8) 测量的差异表明 ΛCDM 模型可能存在问题.
- 结构的增长速度是暗能量和修改引力理论的关键探测器.
研究的目的:
- 为了研究黑暗能量主导的时代大规模结构的增长速度.
- 使用当前的宇宙学数据,在 ΛCDM 框架内测试广义相对论的预测.
- 探索观察到的增长抑制对宇宙学紧张局势的影响.
主要方法:
- 使用"增长指数" (γ) 建模物质扰动的增长速度.
- 分析普朗克卫星 (宇宙微波背景) 的宇宙学数据.
- 利用大规模结构数据,包括弱透镜,星系聚类和宇宙速度测量.
主要成果:
- 宇宙学数据始终有利于抑制的增长率,其增长指数 (γ) 比 ΛCDM 预测 (γ=0.55) 高.
- 结合的数据输出 γ=0.633 ± 0.025 (3.7σ 与 ΛCDM 的张力).
- 结合普朗克和fσ8数据,得到 γ=0.639 ± 0.024 (4.2σ张力),通过协调不同的测量推断来解决S8张力.
结论:
- 有证据表明,大型结构的增长速度被抑制,这挑战了标准的 ΛCDM 模型.
- 观察到的抑制与修改引力或替代暗能量模型相一致.
- 更高的增长指数有效地解决了普朗克和大型结构探测器之间的S8紧张关系.
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