Recent content by Wim

With scalar glueball it became clearer. Still with a tensor glueball to understand, what there for anomalies...

This is very interesting, thank you. I'll figure it out, go through the links in the article and comment later...

Anomalies are instantons? Please specify which anomaly in this case.

Ok 1. "The breaking of the symmetry corresponds to a specific choice of the vacuum, the freedom of choosing a vacuum results in a new degree of freedom: the Nambu-Goldstone- boson." 2. " The second kind of symmetry breaking would be induced by quantum anomalies... which is not related to any...

No, I confine to the renormalizable d = 4 QCD.

V.A. Novikov M.A. Shifman, A.I. Vainshtein and V.I. Zakharov Nuclear Physics B174 (1980) 378-396 About glueballs

Ок M.A. Shifman, A.I. Vainshtein and V.I. Zakharov Nuclear Physics B147 (1979) for example. (in p. 391)

Could you specify any literature about this?

Scalar glueballs in QCD appear as a result of violation of global conformal (scale) symmetry - the energy-momentum tensor has a nonzero trace. According to the Goldstone theorem, this (violation of global symmetry) corresponds to the appearance of scalar massless bosons. Why, then, are the...