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arXiv 0907.2749gr-qcastro-ph.COhep-th
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Dirac Born Infeld标量场驱动的变α

Varying Alpha Driven by the Dirac-Born-Infeld Scalar Field

Hao Wei

摘要:

从大约十年前开始,变化的$α$理论吸引了许多关注,主要是由于来自类星体吸收光谱的第一个观测证据,即精细结构"常数“可能会随着宇宙学时间而变化。在本工作中,我们研究了在狄拉克玻恩因菲尔德(DBI)标量场驱动下的$α$的宇宙演化。一般来说,我们考虑DBI标量场和电磁场之间的各种耦合。我们还将得到的$Δα/α$与观测约束进行了比较,发现$Δα/α$的各种宇宙学演化历史都是允许的.由于对DBI标量场进行了相对论修正,与经典驱动的变化$α$的情况相比,相应的耦合参数约束条件得到了放宽。

英文摘要:

Since about ten years ago, varying $α$ theories attracted many attentions, mainly due to the first observational evidence from the quasar absorption spectra that the fine structure ``constant'' might change with cosmological time. In this work, we investigate the cosmic evolution of $α$ driven by the Dirac-Born-Infeld (DBI) scalar field. To be general, we consider various couplings between the DBI scalar field and the electromagnetic field. We also confront the resulting $Δα/α$ with the observational constraints, and find that various cosmological evolution histories of $Δα/α$ are allowed. Comparing with the case of varying $α$ driven by quintessence, the corresponding constraints on the parameters of coupling have been relaxed, thanks to the relativistic correction of the DBI scalar field.

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