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arXiv 2102.05683hep-thgr-qchep-ph
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没有提升的积极边界

Positivity Bounds without Boosts

Tanguy Grall, Scott Melville

摘要:

我们推导出低能有效场论(EFT)的第一个正性界,它在洛伦兹助推下不是不变的。“正性边界”是紫外线中某些基本性质的低能量表现-迄今为止,它们已被用于约束各种各样的EFT,然而,由于所有现有的边界都需要洛伦兹不变性,因此当这种对称性被打破时,它们不能直接适用,例如对于大多数宇宙学和凝聚态系统。从UV公理的么正性,因果性和局部性,我们得到了一个无限的家庭的界限(衍生物)的$2\to2$ EFT散射振幅必须满足,即使当洛仑兹提升被打破(无论是自发或明确)。我们将这些界限应用于超流体和膨胀过程中产生的标量波动的首阶EFT,在后一种情况下,与当前对原始非高斯性的观测约束进行比较。

英文摘要:

We derive the first positivity bounds for low-energy Effective Field Theories (EFTs) that are not invariant under Lorentz boosts. "Positivity bounds" are the low-energy manifestation of certain fundamental properties in the UV -- to date they have been used to constrain a wide variety of EFTs, however since all of the existing bounds require Lorentz invariance they are not directly applicable when this symmetry is broken, such as for most cosmological and condensed matter systems. From the UV axioms of unitarity, causality and locality, we derive an infinite family of bounds which (derivatives of) the $2\to2$ EFT scattering amplitude must satisfy even when Lorentz boosts are broken (either spontaneously or explicitly). We apply these bounds to the leading-order EFT of both a superfluid and the scalar fluctuations produced during inflation, comparing in the latter case with the current observational constraints on primordial non-Gaussianity.

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