The Gribov problem and QCD dynamics

Understand

In 1967, Faddeev and Popov were able to quantize the Yang-Mills theory by introducing new particles called ghost through the introduction of a gauge.

• Ever since, this quantization has become a standard textbook item.
• Some years later, Gribov discovered that the gauge fixing was not complete, gauge copies called Gribov copies were still present and could affect the infrared region of quantities like the gauge dependent gluon and ghost propagator.
• This feature was often in literature related to confinement.