演化虫洞宇宙学：修正的弗里德曼动力学与观测约束
Evolving wormhole cosmology: modified Friedmann dynamics and observational constraints
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中文总结 AI 辅助
本文构建了基于莫里斯-索恩度规的演化虫洞宇宙学模型，推导出修正弗里德曼方程，并用多种观测数据验证，提出喉部半径作为区分虫洞与暗能量的新可观测量。
中文摘要 AI 辅助
我们基于莫里斯-索恩度规，在空间平坦的弗里德曼-勒梅特-罗伯逊-沃尔克背景下，利用一个可分离且含时间依赖形状函数的度规，构建了一个演化的虫洞宇宙学模型。我们推导了修正的虫洞能量-动量张量，并引入体积平均程序，从而得到带有红移依赖虫洞修正项的修正弗里德曼方程。我们证明，形状函数指数与喉部演化指数可合并为一个宏观指数 $\eta$，并展示由此得到的虫洞状态方程与该几何平均过程一致。所有可穿越性条件均得到验证。将该模型与宇宙学计时器、暗能量光谱仪巡天第二版重子声学振荡数据以及标准重子声学振荡数据在七种数据集组合下进行对比，我们发现所有组合彼此一致；联合拟合给出的当前膨胀速率介于局域测量与宇宙微波背景推断值之间，减速到加速的转变与独立测定结果一致，且有效暗能量状态方程接近但可区别于纯宇宙学常数。演化喉部半径提供了一种新颖的、几何特异的可观测量，可用于区分虫洞时空与现象学暗能量参数化。
英文摘要
We construct an evolving wormhole cosmological model from a Morris--Thorne metric with a separable, time-dependent shape function in a spatially flat Friedmann--Lemaitre--Robertson--Walker background, deriving the corrected wormhole energy-momentum tensor and a volume-averaging procedure that yields a modified Friedmann equation with a redshift-dependent wormhole correction term. We show that the shape-function index and throat-evolution exponent combine into a single macroscopic exponent $β$, and we demonstrate that the resulting wormhole equation of state is consistent with this geometric averaging. All traversability conditions are verified. Confronting the model with cosmic chronometer, DESI Data Release~2 BAO, and standard BAO data across seven dataset combinations, our findings show that all combinations are mutually consistent, with the joint fit giving a present-day expansion rate intermediate between local and CMB-inferred values, a deceleration-to-acceleration transition consistent with independent determinations, and an effective dark-energy equation of state close to, but distinguishable from, a pure cosmological constant. The evolving throat radius offers a novel, geometry-specific observable for discriminating wormhole spacetimes from phenomenological dark-energy parametrisations.
发表机构
- Jadavpur University（贾达普大学）
- Fukushima University（福岛大学）
- Asutosh College（阿苏托什学院）
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