科研之友
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摘要
We consider a scalar field model with a g phi(4)(4) interaction and compute the mass correction at next-toleading order in a large-N expansion to study the summability of the perturbative series. It is already known that at zero temperature this model has a singularity in the Borel plane (a "renormalon"). We find that a small increase in temperature adds two countable sets both with an infinite number of renormalons. For one of the sets the position of the poles is thermal independent and the residue is thermal dependent. In the other one both the position of poles and the residues are thermal dependent. However, if we consider the model at extremely high temperatures, such that a dimensional reduction takes place, one observes that all the renormalons disappear and the model becomes Borel summable.
- 出版日期2018-8-15
