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Fixing the implicit integration

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This commit is contained in:
Guido Cossu
2017-03-01 11:56:35 +00:00
parent 596dcd85b2
commit ec035983fd
3 changed files with 30 additions and 21 deletions
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2
lib/qcd/hmc/GenericHMCrunner.h
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@@ -142,7 +142,7 @@ class HMCWrapperTemplate: public HMCRunnerBase<ReaderClass> {
//TrivialMetric<typename Implementation::Field> Mtr;
ConjugateGradient<LatticeGaugeField> CG(1.0e-8,10000);
LaplacianParams LapPar(0.0001, 1.0, 1000, 1e-8, 12, 64);
RealD Kappa = 0.9;
RealD Kappa = 0.6;
// Better to pass the generalised momenta to the integrator
LaplacianAdjointField<PeriodicGimplR> Laplacian(UGrid, CG, LapPar, Kappa);

41
lib/qcd/hmc/integrators/Integrator.h
View File

@@ -114,6 +114,23 @@ class Integrator {
void update_P(MomentaField& Mom, Field& U, int level, double ep) {
// input U actually not used in the fundamental case
// Fundamental updates, include smearing
// Generalised momenta
// Derivative of the kinetic term must be computed before
// Mom is the momenta and gets updated by the
// actions derivatives
MomentaField MomDer(P.Mom._grid);
P.M.ImportGauge(U);
P.DerivativeU(P.Mom, MomDer);
Mom -= MomDer * ep;
// Auxiliary fields
//P.update_auxiliary_momenta(ep*0.5);
//P.AuxiliaryFieldsDerivative(MomDer);
//Mom -= MomDer * ep;
//P.update_auxiliary_momenta(ep*0.5);
for (int a = 0; a < as[level].actions.size(); ++a) {
Field force(U._grid);
conformable(U._grid, Mom._grid);
@@ -128,17 +145,7 @@ class Integrator {
Mom -= force * ep;
}
// Generalised momenta
MomentaField MomDer(P.Mom._grid);
P.M.ImportGauge(U);
P.DerivativeU(P.Mom, MomDer);
Mom -= MomDer * ep;
// Auxiliary fields
//P.update_auxiliary_momenta(ep*0.5);
//P.AuxiliaryFieldsDerivative(MomDer);
//Mom -= MomDer * ep;
//P.update_auxiliary_momenta(ep*0.5);
// Force from the other representations
as[level].apply(update_P_hireps, Representations, Mom, U, ep);
@@ -179,9 +186,11 @@ class Integrator {
MomentaField AuxDer(P.Mom._grid);
MomDer1 = zero;
MomentaField diff(P.Mom._grid);
if (intermediate)
double factor = 2.0;
if (intermediate){
P.DerivativeU(P.Mom, MomDer1);
factor = 1.0;
}
// Auxiliary fields
//P.update_auxiliary_momenta(ep*0.5);
@@ -202,7 +211,7 @@ class Integrator {
std::cout << GridLogIntegrator << "|Force| laplacian site average: " << force_abs
<< std::endl;
NewMom = P.Mom - ep* 0.5 * (2.0*Msum + MomDer + MomDer1);// simplify
NewMom = P.Mom - ep* 0.5 * (2.0*Msum + factor*MomDer + MomDer1);// simplify
diff = NewMom - OldMom;
counter++;
RelativeError = std::sqrt(norm2(diff))/std::sqrt(norm2(NewMom));
@@ -245,7 +254,7 @@ class Integrator {
MomentaField Mom2(P.Mom._grid);
RealD RelativeError;
Field diff(U._grid);
Real threshold = 1e-6;
Real threshold = 1e-8;
int counter = 1;
int MaxCounter = 100;
@@ -269,7 +278,7 @@ class Integrator {
for (int mu = 0; mu < Nd; mu++) {
auto Umu = PeekIndex<LorentzIndex>(U, mu);
auto Pmu = PeekIndex<LorentzIndex>(sum, mu);
Umu = expMat(Pmu, ep * 0.5, 12) * Umu;
Umu = expMat(Pmu, ep * 0.5, 24) * Umu;
PokeIndex<LorentzIndex>(NewU, ProjectOnGroup(Umu), mu);
}
@@ -330,7 +339,7 @@ class Integrator {
}
void reverse_momenta(){
P.Mom *= 1.0;
P.Mom *= -1.0;
}
// to be used by the actionlevel class to iterate