A power counting theorem for a $p^{2a}{\varphi }^4$ tensorial group field theory

Abstract

We introduce a tensorial group field theory endowed with weighted interaction terms of the form $p^{2a}{\varphi }^4$. The model can be seen as a field theory over $d=3,4$ copies of $U(1)$ where formal powers of Laplacian operators, namely ${\Delta }^a$, $a>0$, act on tensorial ${\varphi }^4$-interactions producing, after Fourier transform, $p^{2a}{\varphi }^4$ interactions. Using multi-scale analysis, we provide a power counting theorem for this type of models. A new quantity depending on the incidence matrix between vertices and faces of Feynman graphs is invoked in the degree of divergence of amplitudes. As a result, generally, the divergence degree is enhanced compared to the divergence degree of models without weighted vertices. The subleading terms in the partition function of the ${\varphi }^4$ tensorial models become, in some cases, the dominant ones in the $p^{2a}{\varphi }^4$ models. Finally, we explore sufficient conditions on the parameter $a$ yielding a list of potentially super-renormalizable $p^{2a}{\varphi }^4$ models.

arXiv comment15 pages, 7 figures

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• Flowing in Group Field Theory Space: a Review
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