Tachyon inflation: tests and comparison with single scalar field inflation
Tachyon inflation: tests and comparison with single scalar field inflation
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DOI：
10.1103/physrevd.70.043527
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发表时间：
2004-08
影响因子：
5
通讯作者：
D. Steer;F. Vernizzi
中科院分区：
文献类型：
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作者：
D. Steer;F. Vernizzi
我们比较了标准单标量场的暴胀预测与由速子场驱动的暴胀相的预测。定义了速子膨胀的慢滚形式，导出了标量摄动和张量摄动的谱及其相合关系。在最低阶，标准膨胀和速子膨胀的预测是相同的。高阶偏差存在，并讨论了它们的观测相关性。然后，我们研究了一些典型的暴胀速子势，讨论了它们的观测结果，并将它们与最近的数据进行了比较。所有的模型都预测标量谱指数的负值和非常小的运行，并且它们始终位于数据集的$1\ensuremath{\sigma}$轮廓内。然而，这些模型无法探索蓝标量谱指数和大引力波的状态。最后，给出了无摄动和摄动耦合引力与速子方程的一种新的精确解。
We compare the standard single scalar field inflationary predictions with those of an inflationary phase driven by a tachyon field. A slow-roll formalism is defined for tachyon inflation, and we derive the spectra of scalar and tensor perturbations as well as the consistency relations. At lowest order the predictions of standard and tachyon inflation are shown to be the same. Higher order deviations are present and their observational relevance is discussed. We then study some typical inflationary tachyon potentials, discuss their observational consequences and compare them with recent data. All the models predict a negative and very small running of the scalar spectral index, and they consistently lie within the $1\ensuremath{\sigma}$ contour of the data set. However, the regime of blue scalar spectral index and large gravity waves cannot be explored by these models. Finally, a new exact solution of the unperturbed and perturbed coupled gravity and tachyon equations is also presented.