Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-09-24
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, no figures. Talk presented at the `APCTP-ICTP Joint International Conference 1997 (AIJIC 97) on Recent Developments
Scientific paper
There is considerable freedom in setting boundary conditions to perturbation theory at $t=\pm\infty$. The standard PQED and PQCD expansions are based on the (empty) perturbative vacuum. Since the true QCD ground state is expected to have a condensate of low momentum gluons, I propose studying expansions around states containing free particles. A specific boundary condition (the `Perturbative Gluon Condensate'), which implies a freezing of low momentum gluons, could be a candidate for describing confinement physics. The modified perturbative series has a number of new features, although it is formally equivalent to the standard one and a priori equally justified.
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