Covariant perturbation theory. 3: Spectral representations of the third order form-factors
199013 pages
Published in:
- Nucl.Phys.B 333 (1990) 512-524
- Published: 1990
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Abstract: (Elsevier)
Extension of covariant perturbation theory to third order in curvature requires the triple- spectral forms for one-loop vertex functions of massless fields to be established. For the simplest triangular graph with unit vertices the three spectral masses are known to form a triangle, and the spectral weight is 1 4 πS where S is the area of this triangle. We generalize this result to an arbitrary derivative coupling.- perturbation theory: higher-order
- form factor: spectral representation
- spectral representation: form factor
- field theory: massless
- massless: field theory
- vertex function
- effective action
- operator: nonlocal
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