Correlation functions involving Dirac fields from homotopy algebras II: the interacting theory

Abstract

We extend the formula for correlation functions of free scalar field theories and Dirac field theories in terms of quantum $A_{\infty }$ algebras presented in arXiv:2305.11634 to general scalar-Dirac systems. We obtain the result that the same formula as in the previous paper holds in this case. We show that correlation functions from our formula satisfy the Schwinger-Dyson equations. We therefore confirm that correlation functions from our formula express correlation functions from the ordinary approach of quantum field theory.

36 pages, 16 figures; v2: section 2 and section 4 are improved, the definition of omega_n is modified, text improved and corrected; v3: minor changes, published in PTEP