The 2ppi Expansion: Dynamical Mass Generation and Vacuum Energy *
نویسندگان
چکیده
LTH–601 We discuss the 2P P I expansion, a summation of the bubble graphs up to all orders, by means of the 2D Gross-Neveu toy model, whose exact mass gap and vacuum energy are known. Then we use the expansion to give analytical evidence that a dimension two gluon condensate exists for pure Yang-Mills in the Landau gauge. This A a µ A a µ condensate consequently gives rise to a dynamical gluon mass.
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