PRESERVING UNITARITY IN A NOVEL PERTURBATIVE TECHNIQUE FOR SOLVING QUANTUM-FIELD THEORY
A new perturbative technique for solving a scalar φ2 P theory consists of expanding a φ2(1+δ) interaction in powers of δ. The Green functions are computed as a power series in δ by applying a linear differential operator to the Green functions of a specially constructed intermediate Lagrangian. We c...
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| Format: | Journal article |
| Language: | English |
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Springer-Verlag
1989
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