Causal effective field theories
Causal effective field theories
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因果有效场论
DOI:
10.1103/physrevd.106.105018
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发表时间:
2022
影响因子:
5
通讯作者:
A. Tolley
中科院分区:
文献类型:
--
作者:
Mariana Carrillo González;Claudia de Rham;Victor Pozsgay;A. Tolley
Physical principles such as unitarity, causality, and locality can constrain the space of consistent effective field theories (EFTs) by imposing two-sided bounds on the allowed values of Wilson coefficients. In this paper, we consider the bounds that arise from the requirement of low-energy causality alone, without appealing to any assumptions about UV physics. We focus on shift-symmetric theories, and consider bounds that arise from the propagation around both a homogeneous and a spherically-symmetric background. We find that low-energy causality, namely the requirement that there are no resolvable time advances within the regime of validity of the EFT, produces two-sided bounds in agreement with compact positivity constraints previously obtained from $2 \rightarrow 2$ scattering amplitude dispersion relations using full crossing symmetry.
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