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dmft/hybridization: apply the MC sign once in measure_Gl #99

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Merged
Ooolab merged 2 commits into from
Jul 22, 2026
Merged

dmft/hybridization: apply the MC sign once in measure_Gl #99

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dmft/hybridization: apply the MC sign once in measure_Gl
skilledwolf Jun 11, 2026
ad1bb45
Merge branch 'master' into fix/hyb-legendre-sign
egull Jul 22, 2026
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6 changes: 5 additions & 1 deletion applications/dmft/qmc/hybridization/hybmatrix.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -333,7 +333,11 @@ void hybmatrix::measure_Gl(std::vector<double> &Gl, std::vector<double> &Fl , co
for (int i = 0; i < size(); i++) {
double f_pref=(F_prefactor.find(c_times[i]))->second;
for (int j = 0; j < size(); j++) {
double M_ji = operator() (j, i) * sign;
// The MC sign enters exactly once, via bubble_sign below — the same
// convention as measure_G and measure_Gw. Multiplying it into M_ji as
// well squares it away (sign^2 = 1), which made the Legendre channel
// sign-independent and biased in signful runs.
double M_ji = operator() (j, i);
double argument = c_times[i] - cdagger_times[j];
double bubble_sign = sign;
if (argument < 0) {
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