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arXiv 2011.02957hep-th
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极值有效场论

Extremal Effective Field Theories

Simon Caron-Huot, Vincent Van Duong

摘要:

有效场论(EFT)参数化了短距离动力学的长距离效应,其细节可能是已知的,也可能是未知的。如果因果性和么正性在所有尺度上都满足,那么EFT系数必须服从一定的正性约束。我们从轻实标量场的2到2个散射振幅的角度探索这些约束,使用半定规划来划分对于给定质量阈值M的允许EFT系数的空间。我们指出,所有的EFT参数的上下都有界,有效地表明,维度分析缩放是因果关系的结果。这包括四阶和六阶导数相互作用的系数。我们提出了简单的极值振幅,实现,或“规则”,扭结系数空间和其凸包跨越一个大部分的允许空间。

英文摘要:

Effective field theories (EFT) parameterize the long-distance effects of short-distance dynamics whose details may or may not be known. It is known that EFT coefficients must obey certain positivity constraints if causality and unitarity are satisfied at all scales. We explore those constraints from the perspective of 2 to 2 scattering amplitudes of a light real scalar field, using semi-definite programming to carve out the space of allowed EFT coefficients for a given mass threshold M. We point out that all EFT parameters are bounded both below and above, effectively showing that dimensional analysis scaling is a consequence of causality. This includes the coefficients of four- and six-derivative interactions. We present simple extremal amplitudes which realize, or "rule in", kinks in coefficient space and whose convex hull span a large fraction of the allowed space.

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