On the UV/IR mixing of Lie algebra-type noncommutatitive ${\varphi }^4$-theories

Abstract

We show that a UV divergence of the propagator integral implies the divergences of the UV/IR mixing in the two-point function at one-loop for a ${\varphi }^4$-theory on a generic Lie algebra-type noncommutative space-time. The UV/IR mixing is defined as a UV divergence of the planar contribution and an IR singularity of the non-planar contribution, the latter being due to the former UV divergence, and the UV finiteness of the non-planar contribution. Some properties of this general treatment are discussed. The UV finiteness of the non-planar contribution and the renormalizability of the theory are not treated but commented. Applications are performed for the Moyal space, having a UV/IR mixing, and the $\kappa$-Minkowski space for which the two-point function at one-loop is finite.

arXiv commentv2: addition of criterion (iii). v3: addition of a conclusion upon referee request. v4: correction of some computational errors. 17 + 2 pages

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