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arXiv 1504.01348astro-ph.COgr-qchep-phhep-th
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DBI Galileon暴胀根据普朗克2015

DBI Galileon inflation in the light of Planck 2015

K. Sravan Kumar, Juan C. Bueno Sanchez, Celia Escamilla-Rivera, Joao Marto, Paulo Vargas Moniz

摘要:

在这项工作中,我们考虑了一个DBI Galileon(DBIG)暴胀模型,并通过潜在的独立分析,用Planck 2015和BICEP 2/Keck阵列和Planck(BKP)联合分析数据约束其参数空间。我们把注意力集中在暴胀的解决方案,其特点是恒定或变化的声速以及翘曲因子。我们对模型的弦方面施加限制,例如翘曲因子$\left(f\right)$和诱导重力参数$\left(\tilde{m}\right)$。我们研究了模型的参数空间,发现张量标量比可以低到$r\simeq6\times10^{-4}$,暴胀发生在GUT尺度。此外,我们还得到了张量功率谱的倾斜度,并根据BKP+激光干涉引力波天文台(LIGO)的最新结果检验了标准暴胀相容关系$\left(r=-8n_{t}\right)$,发现DBIG暴胀预言了张量功率谱的红谱指数.

英文摘要:

In this work we consider a DBI Galileon (DBIG) inflationary model and constrain its parameter space with the Planck 2015 and BICEP2/Keck array and Planck (BKP) joint analysis data by means of a potential independent analysis. We focus our attention on inflationary solutions characterized by a constant or varying sound speed as well as warp factor. We impose bounds on stringy aspects of the model, such as the warp factor $\left(f\right)$ and the induced gravity parameter $\left(\tilde{m}\right)$. We study the parameter space of the model and find that the tensor-to-scalar ratio can be as low as $r\simeq6\times10^{-4}$ and inflation happens to be at GUT scale. In addition, we obtain the tilt of the tensor power spectrum and test the standard inflationary consistency relation $\left(r=-8n_{t}\right)$ against the latest bounds from the combined results of BKP+Laser Interferometer Gravitational-Waves Observatory (LIGO), and find that DBIG inflation predicts a red spectral index for the tensor power spectrum.

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