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arXiv 0907.0427hep-thastro-ph.COgr-qc
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与Gauss-Bonnet项耦合的暴胀子的功率谱

Power spectra from an inflaton coupled to the Gauss-Bonnet term

Zong-Kuan Guo, Dominik J. Schwarz

摘要:

我们考虑受弦论启发的高斯-邦纳修正的幂律暴胀。分析了宇宙学扰动的稳定性,得到了允许的参数空间。我们发现,对于GB主导的暴胀紫外不稳定性的标量或张量扰动出现在小尺度上。在势主导的情况下,具有正(或负)耦合的Gauss-Bonnet校正可以导致张量与标量比的减小(或增强)。我们利用WMAP的5年数据对模型参数进行了严格的限制。

英文摘要:

We consider power-law inflation with a Gauss-Bonnet correction inspired by string theory. We analyze the stability of cosmological perturbations and obtain the allowed parameter space. We find that for GB-dominated inflation ultra-violet instabilities of either scalar or tensor perturbations show up on small scales. The Gauss-Bonnet correction with a positive (or negative) coupling may lead to a reduction (or enhancement) of the tensor-to-scalar ratio in the potential-dominated case. We place tight constraints on the model parameters by making use of the WMAP 5-year data.

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