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arXiv 0904.0433astro-ph.CO
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暗能量的宇宙矢量:来自SN,CMB和BAO的约束

Cosmic vector for dark energy: constraints from SN, CMB and BAO

Jose Beltran Jimenez, Ruth Lazkoz, Antonio L. Maroto

摘要:

最近的研究表明,在宇宙尺度上存在一个矢量场可以解释观测到的宇宙加速膨胀,而无需在早期宇宙中引入新的尺度或非自然的初始条件,从而避免了巧合问题。在这里,我们提出了一个详细的分析所施加的限制SNIa,CMB和BAO数据的矢量暗能量模型与一般的空间曲率。我们发现,与标准宇宙学相反,CMB数据排除了这个模型的平坦宇宙,事实上,预测了一个封闭的几何空间部分。我们看到CMB和SNIa Gold数据在1-sigma水平上完全兼容,但SNIa Union数据集与CMB表现出3-sigma张力。在SNIa和BAO测量之间也发现了相同水平的张力。

英文摘要:

It has been recently shown that the presence of a vector field over cosmological scales could explain the observed accelerated expansion of the universe without introducing neither new scales nor unnatural initial conditions in the early universe, thus avoiding the coincidence problem. Here, we present a detailed analysis of the constraints imposed by SNIa, CMB and BAO data on the vector dark energy model with general spatial curvature. We find that contrary to standard cosmology, CMB data excludes a flat universe for this model and, in fact, predicts a closed geometry for the spatial sections. We see that CMB and SNIa Gold data are perfectly compatible at the 1-sigma level, however SNIa Union dataset exhibits a 3-sigma tension with CMB. The same level of tension is also found between SNIa and BAO measurements.

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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