Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-02-15
Physics
High Energy Physics
High Energy Physics - Theory
60 pages, Latex, 6 figures in EPS-format, v2: added sec. 8 and sec. 9, streamlined sec. 10, typos corrected, references added
Scientific paper
In this paper, we propose a new framework for quantum field theory in terms of consistency conditions. The consistency conditions that we consider are "associativity" or "factorization" conditions on the operator product expansion (OPE) of the theory, and are proposed to be the defining property of any quantum field theory. Our framework is presented in the Euclidean setting, and is applicable in principle to any quantum field theory, including non-conformal ones. In our framework, we obtain a characterization of perturbations of a given quantum field theory in terms of a certain cohomology ring of Hochschild-type. We illustrate our framework by the free field, but our constructions are general and apply also to interacting quantum field theories. For such theories, we propose a new scheme to construct the OPE which is based on the use of non-linear quantized field equations.
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