It is shown that the vacuum of QED2 in Minkowski spacetime does not favour a periodic electric mean field. The projected effective action exhibiting a genuine dependence on the non-vanishing background field has been introduced. The functional dependence of the energy density of the vacuum on the assumed periodic vacuum expectation value of the vector potential is determined from the component T00 of the energy-momentum tensor at one-loop order. Treating the background field non-perturbatively, the energy of the vacuum in the presence of a periodic mean field is found not to be equal to the negative of the effective action.
|Number of pages||17|
|Journal||Acta Physica Hungarica New Series Heavy Ion Physics|
|Publication status||Published - Dec 1 2000|
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy(all)