Abstract
Configuration (x-)space renormalization of Euclidean Feynman amplitudes in a massless quantum field theory is reduced to the study of local extensions of associate homogeneous distributions. Primitively divergent graphs are renormalized, in particular, by subtracting the residue of an analytically regularized expression. Examples are given of computing residues that involve zeta values. The renormalized Green functions are again associate homogeneous distributions of the same degree that transform under indecomposable representations of the dilation group.
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Notes
- 1.
- 2.
- 3.
A notion of residue of a Feynman graph has been introduced in the momentum space approach in terms of the graph polynomial [3, 4]. It would be interesting to establish the precise relationship between that notion and ours. The notion of Poincaré residue considered in [12], on the other hand, works in a straightforward manner for simple poles in x-space, a rather unnatural restriction for ultraviolet divergences.
- 4.
A similar decomposition in an overall scale and angle variables is derived and used very recently in momentum space in [9].
- 5.
The fact that the maximum function R, which replaces \(\rho _{\Sigma }(\textbf{x})\) of Theorem 2.2, does not depend smoothly on the coordinates, requires, in general, a special treatment of the lower dimensional manifolds of discontinuities of its derivatives. (See Example 4.1 below.)
- 6.
- 7.
Representations of this type have been considered back in the 1970’s [23] within a study of a spontaneous breaking of dilation symmetry.
- 8.
We thank Detlev Buchholz for stressing this point to us.
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Acknowledgements
The authors thank Detlev Buchholz, Maxim Kontsevich and Dirk Kreimer for discussions. N.N. acknowledges partial support by the French-Bulgarian Project Rila under the contract Egide-Rila N112. N.N. and I.T. acknowledge partial support by grant DO 02-257 of the Bulgarian National Science Foundation. N.N. and I.T. thank the organizers of the International Workshops LT-9 and SQS’2011 for the invitation and the IHÉS and the Theory Division of CERN for hospitality during the course of this work.
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Nikolov, N.M., Stora, R., Todorov, I. (2013). Euclidean Configuration Space Renormalization, Residues and Dilation Anomaly. In: Dobrev, V. (eds) Lie Theory and Its Applications in Physics. Springer Proceedings in Mathematics & Statistics, vol 36. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54270-4_9
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