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(Seminar) Understanding conformal gravity amplitudes
2018-08-01  【 】【打印】【关闭

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

 Chinese Academy of Sciences

Seminar

Title

题目

Understanding conformal gravity amplitudes

Speaker

报告人

Fei Teng

Affiliation

所在单位

Uppsala University

Date

日期

2018年8月1日 14:00

Venue

地点

Conference Room 6420, ITP new building

Abstract

摘要

Quantum field theories with four-derivative kinematic terms have ghostlike non-planewave states, in addition to usual physical planewave states. They are non-unitary, but often have better ultraviolet behavior, which might provide an ultraviolet completion of two-derivative theories. Examples of four-derivative theories include conformal gravity, (DF)^2 theory, etc. In this talk, I will start with factorization property of general four-derivative theories using the technique of mass deformation, which trades non-planewave states into massive planewaves. Then I will classify minimal versus non-minimal four-derivative theories, and discuss general features of the amplitudes. With the above knowledge in mind, I will use SU(1,1)/U(1) coset formalism to construct minimal conformal gravity Lagrangian, and most importantly, identify the non-minimal Lagrangian that produces the Berkovits-Witten amplitudes. 

Contact person

所内联系人

Song He

 

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