We study topological defects constructed from diagonal and non-diagonal gluons in Abelian projection of zero temperature lattice QCD. We compare results obtained in the quenched and non-quenched vacuum field configurations and show that the density of hybrids is higher than the density of monopoles. The density of some hybrids is sensitive to the presence of the virtual fermions.
Boyko, P. Y., Chernodub, M. N., Kovalenko, A. V., Morozov, S. M., & Polikarpov, M. I. (2002). Monopoles and hybrids in Abelian projection of lattice QCD. Nuclear Physics B - Proceedings Supplements, 106–107, 628–630. https://doi.org/10.1016/S0920-5632(01)01799-6