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Covariant laplacian and implicit integration

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This commit is contained in:
Guido Cossu
2017-02-20 11:17:27 +00:00
parent bafb101e4f
commit 97a6b61551
9 changed files with 366 additions and 95 deletions
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43
lib/qcd/hmc/integrators/Integrator.h
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@@ -131,6 +131,49 @@ class Integrator {
as[level].apply(update_P_hireps, Representations, Mom, U, ep);
}
void implicit_update_P(MomentaField& Mom, Field& U, int level, double ep) {
// Fundamental updates, include smearing
MomentaField Msum(Mom._grid);
Msum = zero;
for (int a = 0; a < as[level].actions.size(); ++a) {
// Compute the force
// We need to compute the derivative of the actions
// only once
Field force(U._grid);
conformable(U._grid, Mom._grid);
Field& Us = Smearer.get_U(as[level].actions.at(a)->is_smeared);
as[level].actions.at(a)->deriv(Us, force); // deriv should NOT include Ta
std::cout << GridLogIntegrator << "Smearing (on/off): " << as[level].actions.at(a)->is_smeared << std::endl;
if (as[level].actions.at(a)->is_smeared) Smearer.smeared_force(force);
force = FieldImplementation::projectForce(force); // Ta for gauge fields
Real force_abs = std::sqrt(norm2(force)/U._grid->gSites());
std::cout << GridLogIntegrator << "Force average: " << force_abs << std::endl;
Msum += force;
}
MomentaField NewMom = Mom;
MomentaField OldMom = Mom;
double threshold = 1e-6;
// Here run recursively
do{
MomentaField MomDer(Mom._grid);
OldMom = NewMom;
// Compute the derivative of the kinetic term
// with respect to the gauge field
// Laplacian.Mder(NewMom, MomDer);
// NewMom = Mom - ep*(MomDer + Msum);
} while (norm2(NewMom - OldMom) > threshold);
Mom = NewMom;
// update the auxiliary fields momenta
}
void update_U(Field& U, double ep) {
update_U(P, U, ep);