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Large N_c limit QCD and symmetry preserving truncations for DS and BS equations
2017-09-06  【 】【打印】【关闭

Institute of Theoretical Physics

Chinese Academy of Sciences

 Key Laboratory of Theoretical Physics

Seminar

Title

题目

Large N_c limit QCD and symmetry preserving truncations for DS and BS equations

Speaker

报告人

Prof. Qing Wang 王青教授

Affiliation

所在单位

Tsinghua Univ. 清华大学

 

Date

日期

3:30 pm, Wed., Sep. 06, 2017 (9月6日周三)

Venue

地点

Conference Hall 322, ITP

Abstract

摘要

Abstract: We develop a framework for deriving Dyson-Schwinger Equations (DSEs) and Bethe-Salpeter Equation (BSE) in QCD at large N_c limit. The starting point is a modified form (with auxiliary fields) of QCD generating functional. This framework provides a natural order by order truncation scheme for DSEs and BSE, and the kernels of the equations up to any order are explicitly given. Chiral symmetry (at chiral limit) is preserved in any order truncation, so it exemplifies the symmetry preserving truncation scheme. It provides a method to study DSEs and BSE beyond the Rainbow-Ladder truncation, and is especially useful to study contributions from non-Abelian dynamics (those arise from gluon self-interactions). We also derive the equation for the quark-ghost scattering kernel, and discuss the Slavnov-Taylor identity connecting the quark-gluon vertex, the quark propagator and the quark-ghost scattering kernel.
 

Contact person

所内联系人

杨刚
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