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arXiv 1503.07486astro-ph.COhep-phhep-th
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关于m**2 phi**2和自然通货膨胀的可行性

On the viability of m**2 phi**2 and natural inflation

Ana Achucarro, Vicente Atal, Yvette Welling

摘要:

在单场暴胀的背景下,具有二次势的模型和具有次普朗克衰变常数的自然势的模型与普朗克数据有矛盾。我们表明,当嵌入一个额外的超大质量场的双场模型,他们可以成为一致的观察。如果暴胀子是一个复场(或一个角变量)的相位,受到轻微破缺的U(1)对称性的保护,并且径向分量(其质量远大于哈勃尺度)稳定在次普朗克值,那么我们的结果就成立了。超大质量场的存在,除了修改有效的单场势,导致暴胀子波动的声速降低,这将推动对原始谱的预测向允许的实验值。我们还讨论了线性势的这些影响,并表明该模型也增加了与数据的一致性

英文摘要:

In the context of single field inflation, models with a quadratic potential and models with a natural potential with subplanckian decay constant are in tension with the Planck data. We show that, when embedded in a two-field model with an additional super massive field, they can become consistent with observations. Our results follow if the inflaton is the phase of a complex field (or an angular variable) protected by a mildly broken U(1) symmetry, and the radial component, whose mass is much greater than the Hubble scale, is stabilized at subplanckian values. The presence of the super massive field, besides modifying the effective single field potential, causes a reduction in the speed of sound of the inflaton fluctuations, which drives the prediction for the primordial spectrum towards the allowed experimental values. We discuss these effects also for the linear potential, and show that this model increases its agreement with data as well

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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