AI 中文总结
该研究计算轴向 Bianchi IX 宇宙的共动河外源漂移并进行线性化，发现线性近似下的漂移与轴向 Bianchi I 宇宙一致，而勒梅特-哈勃图则不同。
AI 中文摘要
本研究有两个目标：其一，计算轴向 Bianchi IX 宇宙中共动河外源的漂移，特别是满足带有正宇宙学常数和共动尘埃的爱因斯坦方程的这类宇宙；其二，同时在小各向异性和小正曲率下对该漂移（以及为对比此前已计算的勒梅特-哈勃（Lemaître-Hubble）图）进行线性化。我们发现，该线性近似下的漂移与轴向 Bianchi I 宇宙中的漂移一致，但勒梅特-哈勃图并非如此。
英文摘要
The aim of the present work is two-fold: {\it(i)} Compute the drift of comoving extragalactic sources in axial Bianchi IX universes, in particular in those satisfying Einstein's equations with positive cosmological constant and comoving dust. {\it(ii)} Linearize this drift (and for comparison the previously calculated Lema{î}tre-Hubble diagram) simultaneously in small anisotropy and in small positive curvature. We find that the drift in this linear approximation coincides with the drift in axial Bianchi I universes. This is not true for Lema{î}tre-Hubble diagrams.
Comments19 pages
Journal ref2026 Class. Quantum Grav. 43 135016
