Gluon condensate

In quantum chromodynamics (QCD), the gluon condensate is a non-perturbative property of the QCD vacuum which could be partly responsible for giving masses to certain hadrons.

If the gluon field tensor is represented as G_μν, then the gluon condensate is the vacuum expectation value $\langle G_{\mu\nu}G^{\mu\nu}\rangle$. It is not clear yet whether this condensate is related to any of the known phase changes in quark matter. There have been scattered studies of other types of gluon condensates, involving a different number of gluon fields.

For more on the context in which this quantity occurs, see the article on the QCD vacuum.

See also

• Quantum chromodynamics
• QCD vacuum and chiral condensates
• Vacuum in quantum field theory
• Quark–gluon plasma
• QCD matter

References

Savvidy, G. K., Infrared instability of the vacuum state of gauge theories and asymptotic freedom