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arXiv 0810.1098astro-phgr-qchep-th
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用5年WMAP资料对精细结构常数随时间变化的约束

Constraints on the time variation of the fine structure constant by the 5-year WMAP data

Masahiro Nakashima, Ryo Nagata, Jun'ichi Yokoyama

摘要:

通过对5年WMAP宇宙微波背景资料的分析,得到了复合期精细结构常数相对于其当前值$Δα/α\equiv (α_{\mathrm{rec}} - α_{\mathrm{now}})/α_{\mathrm{now}}$随时间变化的约束条件。作为马尔可夫链蒙特卡罗分析的结果,它被发现,相反的分析基于以前的WMAP数据,$Δα/α=-0.0009$的平均值并没有显着变化,无论我们使用哈勃空间望远镜(HST)的哈勃参数的测量作为先验与否。$Δα/α$的95%置信区间为HST先验的$-0.028 < Δα/α< 0.026$和HST先验的$-0.050 < Δα/α< 0.042$。

英文摘要:

The constraints on the time variation of the fine structure constant at recombination epoch relative to its present value, $Δα/α\equiv (α_{\mathrm{rec}} - α_{\mathrm{now}})/α_{\mathrm{now}}$, are obtained from the analysis of the 5-year WMAP cosmic microwave background data. As a result of Markov-Chain Monte-Carlo analysis, it is found that, contrary to the analysis based on the previous WMAP data, the mean value of $Δα/α=-0.0009$ does not change significantly whether we use the Hubble Space Telescope (HST) measurement of the Hubble parameter as a prior or not. The resultant 95% confidence ranges of $Δα/α$ are $-0.028 < Δα/α< 0.026$ with HST prior and $-0.050 < Δα/α< 0.042$ without HST prior.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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