  We emphasize the usefulness of treating delta resonances as explicit degrees
of freedom in applications of chiral effective field theory (EFT) to
parity-violating and time-reversal-violating (PVTV) nuclear interactions.
Compared with the delta-less framework, the explicit inclusion of the delta
isobar allows one to resum certain types of contributions to the PVTV two-pion
exchange two- and three-nucleon potentials without at the same time introducing
any unknown parameters up to next-to-next-to-leading order in the EFT
expansion. We provide the corresponding expressions for the delta contributions
in momentum and coordinate spaces and compare the convergence of the EFT
expansion in both formulations.
