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Causality bounds on scalar-tensor EFTs by Hong, Dong-Yu; Wang, Zhuo-Hui; Zhou, Shuang-Yong is a scholarly article available to read on EtoBox.

What is Causality bounds on scalar-tensor EFTs about?

We compute the causality/positivity bounds on the Wilson coefficients of scalar-tensor effective field theories. Two-sided bounds are obtained by extracting IR information from UV physics via dispersion relations of scattering amplitudes, making use of the full crossing symmetry. The graviton $t$-channel pole is carefully treated in the numerical optimization, taking into account the constraints with fixed impact parameters. It is shown that the typical sizes of the Wilson coefficients can be estimated by simply inspecting the dispersion relations. We carve out sharp bounds on the leading coefficients, particularly, the scalar-Gauss-Bonnet couplings, and discuss how some bounds vary with the leading $(\partial\phi)^4$ coefficient and as well as phenomenological implications of the causality bounds.

Author

Hong, Dong-Yu; Wang, Zhuo-Hui; Zhou, Shuang-Yong

Published

2023

Language

EN