Normal Coordinates in Kahler Manifolds and the Background Field Method

Kiyoshi Higashijima, Etsuko Itou, Muneto Nitta

Published 2002-03-08, updated 2002-06-17Version 3

Riemann normal coordinates (RNC) are unsuitable for \kahler manifolds since they are not holomorphic. Instead, \kahler normal coordinates (KNC) can be defined as holomorphic coordinates. We prove that KNC transform as a holomorphic tangent vector under holomorphic coordinate transformations, and therefore that they are natural extensions of RNC to the case of \kahler manifolds. The KNC expansion provides a manifestly covariant background field method preserving the complex structure in supersymmetric nonlinear sigma models.