arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.04680hep-thastro-ph.COgr-qc
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随机非吸引子膨胀

Stochastic non-attractor inflation

Hassan Firouzjahi, Amin Nassiri-Rad, Mahdiyar Noorbala

摘要:

我们将随机暴胀的形式推广到具有声速的非吸引子暴胀$c_s$。我们得到了超视界扰动的朗之万方程,并计算了曲率扰动功率谱的随机修正。结果表明,平均e折数和功率谱的分数阶随机校正量均为功率谱量级。我们还计算了场空间中具有两个边界的dS空间中的边界穿越概率和首中概率。进一步计算了在类似于大扩散项永恒暴胀的情况下功率谱的随机修正。

英文摘要:

We extend the formalism of stochastic inflation to the setup of non-attractor inflation with a sound speed $c_s$. We obtain the Langevin equations for the superhorizon perturbations and calculate the stochastic corrections to curvature perturbation power spectrum. It is shown that the fractional stochastic corrections in mean number of e-folds and power spectrum are at the order of power spectrum. We also calculate the boundary crossing and the first hitting probabilities in a hypothetical dS space with two boundaries in field space. Furthermore, the stochastic corrections in power spectrum in a setup akin to eternal inflation with large diffusion term are calculated.

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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