Topological defects and θ dependence in QCD.

Details Topological defects and θ dependence in QCD. Topological defects and θ dependence in QCD.

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nuphs..73..647z&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 73, Issue 1-3, p. 647-649.

Physics

Nuclear Physics

4

Scientific paper

We generalize the large Nc Di Vecchia-Veneziano-Witten (VVW) effective chiral Lagrangian to the case of finite Nc. The picture of θ dependence in QCD which follows from this Lagrangian is more complicated than suggested by the large Nc approach or instanton arguments. Generically, the vacuum energy Evac(θ) is a multi-valued function of θ admitting the existence of metastable states. We discuss applications of the obtained results to the axion physics, baryogenesis and other phenomena which may occur during the QCD epoch in development of the early universe.

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