PTQMC stochastically reproduces exact MBPT coefficients up to 16th order on the Richardson pairing model and defines e^S as a complexity measure that better indicates when perturbative expansions remain valid.
The Padé approximation represents a perturbative series by a ratio of two polynomials and is known to cap- ture nonanalytic structures such as singularities
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Stochastic many-body perturbation theory for high-order calculations
PTQMC stochastically reproduces exact MBPT coefficients up to 16th order on the Richardson pairing model and defines e^S as a complexity measure that better indicates when perturbative expansions remain valid.