Journal
PHYSICS LETTERS B
Volume 808, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2020.135627
Keywords
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Funding
- U.S. Department of Energy, Office of High Energy Physics [DE-SC0010339]
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Expansions of physical functions are controlled by their singularities, which have special structure because they themselves are physical, corresponding to instantons, caustics or saddle configurations. Resurgent asymptotics formalizes this idea mathematically, and leads to significantly more powerful extrapolation methods to extract physical information from a finite number of terms of an expansion, including precise decoding of non-perturbative effects. We quantify the gain of precision for various extrapolation procedures, showing that significant improvements can be achieved using exactly the same input data, and we illustrate the general method with examples from quantum mechanics and quantum field theory. (C) 2020 The Author(s). Published by Elsevier B.V.
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