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Accueil > Événements > Actualités > Seminars

Séminaire théorie

Kris van Houcke (LPS, ENS, Paris)
Solving fermionic many-body problems by summing Feynman diagrams
Lieu : Amphithéâtre, maison des Magistères,
le vendredi 31 mars 2017 à 11h00
Personne à contacter :

It is commonly believed that in quantum Monte Carlo (QMC) approaches to fermionic many-body problems, the infamous sign problem generically implies prohibitively large computational times in the thermodynamic limit. I will point out that for convergent (or subject to resummation) Feynman diagrammatic series evaluated with the Monte Carlo algorithm of [Rossi, arXiv:1612.05184], the computational time increases only polynomially with the inverse error on thermodynamic-limit quantities. I will discuss the computational complexity problem for different QMC approaches: conventional techniques (auxiliary-field, path-integral and diffusion QMC) and diagrammatic Monte Carlo approaches. I will also report on recent progress of Diagrammatic Monte Carlo simulation of the resonant Fermi gas and the homogeneous electron gas.


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