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arXiv 0909.5095astro-ph.CO
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用天体物理数据约束超临界弦/膜宇宙学

Constraining super-critical string/brane cosmologies with astrophysical data

Vasiliki A. Mitsou

摘要:

我们讨论了非常规的暗能量模型与高红移超新星、遥远星系和重子振荡的数据的拟合。这些模型是基于膜宇宙学或刘维尔弦,其中弛豫暗能量是由一个滚动的量子场(Q-宇宙学)。这种宇宙学的特点是可能存在有效的四维负能量尘埃和/或暗物质的奇异尺度。我们发现了当前时代负能量尘埃的证据,以及对能量密度的外来标度(a^{-delta})贡献的证据,delta = 4,这可能是由于暗物质与Q宇宙学模型中的介子耦合。我们的结论是,Q-宇宙学适合的数据同样很好的LambdaCDM模型的参数范围内,一般预期从理论上考虑。

英文摘要:

We discuss fits of unconventional dark energy models to the available data from high-redshift supernovae, distant galaxies and baryon oscillations. The models are based either on brane cosmologies or on Liouville strings in which a relaxation dark energy is provided by a rolling dilaton field (Q-cosmology). Such cosmologies feature the possibility of effective four-dimensional negative-energy dust and/or exotic scaling of dark matter. We find evidence for a negative-energy dust at the current era, as well as for exotic-scaling (a^{-delta}) contributions to the energy density, with delta ~= 4, which could be due to dark matter coupling with the dilaton in Q-cosmology models. We conclude that Q-cosmology fits the data equally well with the LambdaCDM model for a range of parameters that are in general expected from theoretical considerations.

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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