421 citations · 1.5k across the 60 of their papers we have counts for
Showing 2009 · cond-mat.str-elShow all
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cond-mat.str-el2009★ 9 cited
Tree expansion in time-dependent perturbation theory
Christian Brouder, Ângela Mestre, Frédéric Patras
The computational complexity of time-dependent perturbation theory is well-known to be largely combinatorial whatever the chosen expansion method and family of parameters (combinat…
cond-mat.str-el2009★ 20 cited
The many-body Green function of degenerate systems
Christian Brouder, Gianluca Panati, Gabriel Stoltz
A rigorous non perturbative adiabatic approximation of the evolution operator in the many-body physics of degenerate systems is derived. This approximation is used to solve the lon…