Speaker
Description
This talk presents a bottom-up open effective field theory (EFT) for non-Abelian gauge theories within the Schwinger-Keldysh formalism. Instead of integrating out the environment completely and starting from a nonlocal influence functional, we retain slow environmental response variables and construct a local system-environment EFT. The environmental sector, described by dynamical color-frame variables, Stückelberg-like fields, and color-current degrees of freedom, encodes interactions and dissipation between the system and the environment. This provides a gauge-covariant Markovian embedding of nonlocal and non-Markovian color response. Integrating out the retained variables with retarded boundary conditions yields nonlocal dissipative kernels and stochastic sources in the reduced system theory. This talk is based on joint work with Yoshihiko Abe, arXiv:2605.22822.