宇宙非均匀性塑造暗能量与时间的演化
Cosmic Heterogeneity Shapes the Evolution of Dark Energy and Time
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中文总结 AI 辅助
该研究从宇宙体积动力学和物质非均匀性出发，推导出暗能量密度等参数，解释哈勃张力，并预测随时间演化的暗能量及缩短的宇宙年龄。
中文摘要 AI 辅助
早期宇宙与晚期宇宙对哈勃常数的测量结果不一致，这一难题被称为哈勃张力。我们仅利用宇宙体积的动力学以及物质可能不均匀分布的可能性，从第一性原理推导出宇宙学参数。在此框架下，标准模型的六个参数中有三个由底层动力学获得，而非拟合观测数据：体积形成决定了暗能量密度参数为三分之二，空间曲率为零，物质密度则来自剩余的宇宙能量预算。哈勃常数仍作为观测输入，因为它代表一个日历日期而非宇宙的内在属性，而其余两个参数同样取自观测。一旦将宇宙非均匀性作为动力学成分纳入，膨胀速率和暗能量密度参数都变得依赖于红移。后者向当前时刻增加了百分之八，从均匀早期宇宙的0.679增加到今天的0.735，这与跨越多个数量级红移的独立探针一致，包括微波背景、超新星、重子声学振荡、X射线星系团和引力波。这一相同机制产生了近期联合分析所青睐的随时间演化的暗能量，且无需引入新的自由参数。对由此得到的膨胀历史进行积分，得出宇宙年龄为13.521吉年，比均匀值短0.306吉年。这一差异是一种全局时间膨胀：暗能量和时间共同演化，由宇宙的非均匀性所塑造。
英文摘要
Early- and late-Universe measurements of the Hubble constant disagree, a puzzle known as the Hubble tension. We derive cosmological parameters from first principles, using only the dynamics of cosmic volume and the possibility that matter can be unevenly distributed. Within this framework, three of the six parameters of the standard model are obtained from the underlying dynamics rather than fitted to observations: volume formation determines the dark-energy density parameter to be two thirds, spatial curvature vanishes, and the matter density follows from the remaining cosmic energy budget. The Hubble constant remains an observational input because it represents a calendar date rather than an intrinsic property of the Universe, while the two remaining parameters are likewise taken from observation. Once cosmic unevenness is included as a dynamical component, both the expansion rate and the dark-energy density parameter become redshift dependent. The latter increases by eight percent toward the present, from 0.679 in the homogeneous early Universe to 0.735 today, consistent with independent probes spanning several orders of magnitude in redshift, including the microwave background, supernovae, baryon acoustic oscillations, X-ray clusters and gravitational waves. This same mechanism yields the time-evolving dark energy favored by recent combined analyses without introducing a new free parameter. Integrating the resulting expansion history gives a cosmic age of 13.521 Gyr, shorter than the homogeneous value by 0.306 Gyr. This difference is a global time dilation: dark energy and time evolve together, shaped by the unevenness of the cosmos.
发表机构
- Altes Gymnasium Bremen（不来梅老中学）
- University of Bremen（不来梅大学）
- Studienseminar Stade（施塔特教师培训学院）
- Gymnasium Athenaeum and Observatory Stade（施塔特阿提那姆中学和天文台）
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