来自遥远类星体光谱中吸收线的低能极限下电磁精细结构常数的时间变化限制。

Limits on the time variation of the electromagnetic fine-structure constant in the low energy limit from absorption lines in the spectra of distant quasars.

作者信息

Srianand R, Chand H, Petitjean P, Aracil B

机构信息

IUCAA, Post Bag 4, Ganeshkhind, Pune 411 007, India.

出版信息

Phys Rev Lett. 2004 Mar 26;92(12):121302. doi: 10.1103/PhysRevLett.92.121302.

DOI:10.1103/PhysRevLett.92.121302

PMID:15089663

Abstract

We present the results of a detailed many-multiplet analysis performed on a new sample of Mg ii systems observed in high quality quasar spectra obtained using the Very Large Telescope. The weighted mean value of the variation in alpha derived from our analysis over the redshift range 0.4</=z</=2.3 is Deltaalpha/alpha=(-0.06+/-0.06)x10(-5). The median redshift of our sample (z approximately 1.55) corresponds to a look-back time of 9.7 Gyr in the most favored cosmological model today. This gives a 3sigma limit, -2.5 x 10(-16)</=(Deltaalpha/alphaDeltat)</=+1.2 x 10(-16) yr(-1), for the time variation of alpha, that forms the strongest constraint obtained based on high redshift quasar absorption line systems.

摘要

我们展示了对使用甚大望远镜获得的高质量类星体光谱中观测到的镁二系统新样本进行详细多多重态分析的结果。我们分析得出的在红移范围0.4≤z≤2.3内α变化的加权平均值为Δα/α = (-0.06±0.06)×10⁻⁵。我们样本的中值红移（z约为1.55）在当今最受青睐的宇宙学模型中对应着97亿年的回溯时间。这给出了α随时间变化的3σ限制，即 -2.5×10⁻¹⁶≤(Δα/αΔt)≤ +1.2×10⁻¹⁶ 年⁻¹，这是基于高红移类星体吸收线系统获得的最强限制。