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arXiv 1004.3801hep-thastro-ph.COhep-ph
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从普朗克尺度降低暴胀的敏感性

Desensitizing Inflation from the Planck Scale

Daniel Baumann, Daniel Green

摘要:

提出了一种新的机制,以控制普朗克尺度修正的暴胀eta参数。解决eta问题的一个常用方法是在暴胀子场上施加一个位移对称性。然而,这种对称性必须保持不被普朗克尺度效应破坏,这是对理论可能的紫外线完成的一个相当强的要求。在本文中,我们表明,如果暴胀子场与共形扇区相互作用,普朗克尺度修正的移位对称性的破缺可以被系统地抑制。然后暴胀子在共形场论中得到一个反常的维度,这导致所有危险的高能修正被隔离。我们分析了一些模型中的机制,可以看到在行动中。在我们最详细的例子中,我们通过a-最大化计算了精确的反常维数,并表明eta问题可以只用弱耦合物理来解决。

英文摘要:

A new mechanism to control Planck-scale corrections to the inflationary eta parameter is proposed. A common approach to the eta problem is to impose a shift symmetry on the inflaton field. However, this symmetry has to remain unbroken by Planck-scale effects, which is a rather strong requirement on possible ultraviolet completions of the theory. In this paper, we show that the breaking of the shift symmetry by Planck-scale corrections can be systematically suppressed if the inflaton field interacts with a conformal sector. The inflaton then receives an anomalous dimension in the conformal field theory, which leads to sequestering of all dangerous high-energy corrections. We analyze a number of models where the mechanism can be seen in action. In our most detailed example we compute the exact anomalous dimensions via a-maximization and show that the eta problem can be solved using only weakly-coupled physics.

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