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arXiv 2005.05146hep-thastro-ph.COgr-qchep-ph
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通货膨胀与脱钩

Inflation and Decoupling

Gia Dvali, Alex Kehagias, Antonio Riotto

摘要:

有效低能理论中的重模退耦是物理学中最基本的概念之一。它告诉我们,模式必须有一个可以忽略不计的影响的引力背景的曲率半径大于其波长。尽管如此,仍有人声称,即使哈勃参数与普朗克质量相比可以忽略不计,反普朗克模式对暴胀的持续时间也有严格的限制。如果这是真的,这将意味着通货膨胀违反了脱钩原则,或者至少需要重新表述。我们澄清了这些界限所依据的基本误解,并分别驳斥了它们。我们的结论是暴胀完全落在一个可靠的有效场论处理的有效性范围内,并且不受任何虚假的trans-Planckian问题的影响。

英文摘要:

Decoupling of heavy modes in effective low energy theory is one of the most fundamental concepts in physics. It tells us that modes must have a negligible effect on the physics of gravitational backgrounds with curvature radius larger than their wavelengths. Despite this, there exist claims that trans-Planckian modes put severe bound on the duration of inflation even when the Hubble parameter is negligible as compared to the Planck mass. If true, this would mean that inflation violates the principle of decoupling or at least requires its reformulation. We clarify the fundamental misconception on which these bounds are based and respectively refute them. Our conclusion is that inflation fully falls within the validity of a reliable effective field theory treatment and does not suffer from any spurious trans-Planckian problem.

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