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.
We initialize the walker population to represent the first-order amplitudes w(1) (which enter the second-order energy estimator E(2) in Eq
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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.