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arXiv 1801.02187astro-ph.COgr-qchep-ph
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普朗克2015年后膜膨胀的约束:哈勃常数最新局部测量的影响

Constraints on brane inflation after Planck 2015: Impacts of the latest local measurement of the Hubble constant

Rui-Yun Guo, Lei Zhang, Jing-Fei Zhang, Xin Zhang

摘要:

通过在全局拟合中考虑哈勃常数的最新局部测量,研究了三种典型膜暴胀模型的观测约束。在我们的分析中,我们还使用了其他观测数据,包括普朗克2015 CMB数据,BICEP 2/Keck阵列B模式数据和重子声学振荡数据。已有的研究表明,加入最新的本地$H_{0}$测量值有利于获得更大的谱指数,并且可以对暴胀模型的选择产生重要影响。在这项工作中,我们调查的膜膨胀模型的状态的影响。我们发现,当考虑直接的$H_{0}$测量时,在$2σ$能级范围内,膜膨胀的原型模型仍然与当前的观测数据符合得很好.对于KKLMMT模型,考虑$H_{0}$测量允许将参数$β$的范围放大到${\cal O}(10^{-2})$,这稍微简化了微调问题。对于IR DBI模型,添加$H_{0}$测量值不会提供更好的拟合。这些结果表明,新的$H_{0}$先验的考虑可以对膜膨胀模型产生相当大的影响。最后,我们证明了当$β\lesssim 1.1$时,IR DBI暴胀模型中的等边非高斯性与当前CMB数据在1 $σ$水平上是相容的。

英文摘要:

We investigate the observational constraints on three typical brane inflation models by considering the latest local measurement of the Hubble constant in the global fit. We also employ other observational data, including the Planck 2015 CMB data, the BICEP2/Keck Array B-mode data, and the baryon acoustic oscillations data, in our analysis. Previous studies have shown that the addition of the latest local $H_{0}$ measurement favors a larger spectral index, and can exert a significant influence on the model selection of inflation. In this work, we investigate its impacts on the status of brane inflation models. We find that, when the direct $H_{0}$ measurement is considered, the prototype model of brane inflation is still in good agreement with the current observational data within the $2σ$ level range. For the KKLMMT model, the consideration of the $H_{0}$ measurement allows the range of the parameter $β$ to be amplified to ${\cal O}(10^{-2})$, which slightly alleviates the fine-tuning problem. For the IR DBI model, the addition of the $H_{0}$ measurement does not provide a better fit. These results show that the consideration of the new $H_{0}$ prior can exert a considerable influence on the brane inflation models. At last, we show that, when $β\lesssim 1.1$, the equilateral non-Gaussianity in the IR DBI inflation model is compatible with the current CMB data at the 1$σ$ level.

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