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arXiv 1012.2900hep-phastro-ph.COhep-th
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Higgs-Palatini暴胀和么正性

Higgs-Palatini Inflation and Unitarity

Florian Bauer, Durmus A. Demir

摘要:

在希格斯暴胀的情况下,希格斯场与里奇标量强耦合,以驱动原始暴胀。然而,在引力的纯度规表述的原始形式中,希格斯相互作用的紫外线(UV)截止和哈勃速率具有相同的量级,这使得整个暴胀演化依赖于希格斯扇区未知的紫外线完成。这个问题,即幺正性破坏,困扰着希格斯暴胀理论。在这封信中,我们表明,在帕拉蒂尼制定的引力,希格斯通货膨胀不会遭受幺正性破坏,因为紫外线截断位于参数远高于哈勃率,使未知的紫外物理不破坏暴胀动力学。因此,我们所说的希格斯-帕拉蒂尼暴胀是紫外线安全的,最小的,并具有预测能力。

英文摘要:

In the Higgs inflation scenario the Higgs field is strongly coupled to the Ricci scalar in order to drive primordial inflation. However, in its original form in pure metric formulation of gravity, the ultraviolet (UV) cutoff of the Higgs interactions and the Hubble rate are of the same magnitude, and this makes the whole inflationary evolution dependent of the unknown UV completion of the Higgs sector. This problem, the unitarity violation, plagues the Higgs inflation scenario. In this letter we show that, in the Palatini formulation of gravitation, Higgs inflation does not suffer from unitarity violation since the UV cutoff lies parametrically much higher than the Hubble rate so that unknown UV physics does not disrupt the inflationary dynamics. Higgs-Palatini inflation, as we call it, is, therefore, UV-safe, minimal and endowed with predictive power.

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