An introduction to resurgence, trans-series and alien calculus. (English) Zbl 1425.81003
Summary: In these notes we give an overview of different topics in resurgence theory from a physics point of view, but with particular mathematical flavour. After a short review of the standard Borel method for the resummation of asymptotic series, we introduce the class of simple resurgent functions, explaining their importance in physical problems. We define the Stokes automorphism and the alien derivative and discuss these objects in concrete examples using the notion of trans-series expansion. With all the tools introduced, we see how resurgence and alien calculus allow us to extract non-perturbative physics from perturbation theory. To conclude, we apply Morse theory to a toy model path integral to understand why physical observables should be resurgent functions.
MSC:
| 81-02 | Research exposition (monographs, survey articles) pertaining to quantum theory |
| 81T16 | Nonperturbative methods of renormalization applied to problems in quantum field theory |
| 41A60 | Asymptotic approximations, asymptotic expansions (steepest descent, etc.) |
Keywords:
resurgence theory; non-perturbative methods; asymptotic expansion; alien calculus; Morse theorySoftware:
DLMFReferences:
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