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  Location: Home >  Research Activities >  Seminar
Positivity bounds in effective field theories
2019-05-22     Text Size:  A

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

Chinese Academy of Sciences

Seminar

Title

题目

Positivity bounds in effective field theories

Speaker

报告人

Shuang-Yong Zhou                                   

Affiliation

所在单位

USTC

Date

日期

2:30pm, May 22, 2019, Wednesday
 

Venue

地点

ITP South (New) Building 6420

Abstract

摘要

Locality, unitarity and analyticity are some of the most fundamental properties of quantum field theory. I will show how requiring a local, analytic, unitary UV completion for a low energy effective theory (EFT) can impose positivity bounds on the Wilson coefficients in the EFT. These positivity bounds take the form of constraints on combinations of the pole subtracted scattering amplitude and its derivatives. I will first demonstrate the main idea with the simple case of a massive scalar field, and then discuss the technical subtleties that arise when generalising to cases with nonzero spins. These positivity pounds can be applied to any EFTs. As an illustration, I will apply these positivity bounds to a few well-konwn EFTs, including galileon, standard model effective field theory and massive gravity.

Contact Person

所内联系人

Gang Yang
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