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Coulomb gauge added as an option

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This commit is contained in:
Peter Boyle 2019-05-17 17:36:32 +01:00
parent 0a8b6724ef
commit 48b1c806ed
2 changed files with 70 additions and 22 deletions
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72
Grid/qcd/utils/GaugeFix.h
View File

@ -31,6 +31,7 @@ Author: Peter Boyle <paboyle@ph.ed.ac.uk>
namespace Grid {
namespace QCD {
template <class Gimpl>
class FourierAcceleratedGaugeFixer : public Gimpl {
public:
@ -45,18 +46,21 @@ class FourierAcceleratedGaugeFixer : public Gimpl {
A[mu] = Ta(U[mu]) * cmi;
}
}
static void DmuAmu(const std::vector<GaugeMat> &A,GaugeMat &dmuAmu) {
static void DmuAmu(const std::vector<GaugeMat> &A,GaugeMat &dmuAmu,int orthog) {
dmuAmu=zero;
for(int mu=0;mu<Nd;mu++){
dmuAmu = dmuAmu + A[mu] - Cshift(A[mu],mu,-1);
if ( mu != orthog ) {
dmuAmu = dmuAmu + A[mu] - Cshift(A[mu],mu,-1);
}
}
}
static void SteepestDescentGaugeFix(GaugeLorentz &Umu,Real & alpha,int maxiter,Real Omega_tol, Real Phi_tol,bool Fourier=false) {
static void SteepestDescentGaugeFix(GaugeLorentz &Umu,Real & alpha,int maxiter,Real Omega_tol, Real Phi_tol,bool Fourier=false,int orthog=-1) {
GridBase *grid = Umu._grid;
GaugeMat xform(grid);
SteepestDescentGaugeFix(Umu,xform,alpha,maxiter,Omega_tol,Phi_tol,Fourier);
SteepestDescentGaugeFix(Umu,xform,alpha,maxiter,Omega_tol,Phi_tol,Fourier,orthog);
}
static void SteepestDescentGaugeFix(GaugeLorentz &Umu,GaugeMat &xform,Real & alpha,int maxiter,Real Omega_tol, Real Phi_tol,bool Fourier=false) {
static void SteepestDescentGaugeFix(GaugeLorentz &Umu,GaugeMat &xform,Real & alpha,int maxiter,Real Omega_tol, Real Phi_tol,bool Fourier=false,int orthog=-1) {
GridBase *grid = Umu._grid;
@ -71,15 +75,29 @@ class FourierAcceleratedGaugeFixer : public Gimpl {
GaugeMat dmuAmu(grid);
{
Real plaq =WilsonLoops<Gimpl>::avgPlaquette(Umu);
Real link_trace=WilsonLoops<Gimpl>::linkTrace(Umu);
if( (orthog>=0) && (orthog<Nd) ){
std::cout << GridLogMessage << " Gauge fixing to Coulomb gauge time="<<orthog<< " plaq= "<<plaq<<" link trace = "<<link_trace<< std::endl;
} else {
std::cout << GridLogMessage << " Gauge fixing to Landau gauge plaq= "<<plaq<<" link trace = "<<link_trace<< std::endl;
}
}
for(int i=0;i<maxiter;i++){
for(int mu=0;mu<Nd;mu++) U[mu]= PeekIndex<LorentzIndex>(Umu,mu);
if ( Fourier==false ) {
trG = SteepestDescentStep(U,xform,alpha,dmuAmu);
trG = SteepestDescentStep(U,xform,alpha,dmuAmu,orthog);
} else {
trG = FourierAccelSteepestDescentStep(U,xform,alpha,dmuAmu);
trG = FourierAccelSteepestDescentStep(U,xform,alpha,dmuAmu,orthog);
}
// std::cout << GridLogMessage << "trG "<< trG<< std::endl;
// std::cout << GridLogMessage << "xform "<< norm2(xform)<< std::endl;
// std::cout << GridLogMessage << "dmuAmu "<< norm2(dmuAmu)<< std::endl;
for(int mu=0;mu<Nd;mu++) PokeIndex<LorentzIndex>(Umu,U[mu],mu);
// Monitor progress and convergence test
// infrequently to minimise cost overhead
@ -106,14 +124,14 @@ class FourierAcceleratedGaugeFixer : public Gimpl {
}
}
};
static Real SteepestDescentStep(std::vector<GaugeMat> &U,GaugeMat &xform,Real & alpha, GaugeMat & dmuAmu) {
static Real SteepestDescentStep(std::vector<GaugeMat> &U,GaugeMat &xform,Real & alpha, GaugeMat & dmuAmu,int orthog) {
GridBase *grid = U[0]._grid;
std::vector<GaugeMat> A(Nd,grid);
GaugeMat g(grid);
GaugeLinkToLieAlgebraField(U,A);
ExpiAlphaDmuAmu(A,g,alpha,dmuAmu);
ExpiAlphaDmuAmu(A,g,alpha,dmuAmu,orthog);
Real vol = grid->gSites();
@ -125,7 +143,7 @@ class FourierAcceleratedGaugeFixer : public Gimpl {
return trG;
}
static Real FourierAccelSteepestDescentStep(std::vector<GaugeMat> &U,GaugeMat &xform,Real & alpha, GaugeMat & dmuAmu) {
static Real FourierAccelSteepestDescentStep(std::vector<GaugeMat> &U,GaugeMat &xform,Real & alpha, GaugeMat & dmuAmu,int orthog) {
GridBase *grid = U[0]._grid;
@ -144,31 +162,41 @@ class FourierAcceleratedGaugeFixer : public Gimpl {
GaugeLinkToLieAlgebraField(U,A);
DmuAmu(A,dmuAmu);
DmuAmu(A,dmuAmu,orthog);
theFFT.FFT_all_dim(dmuAmu_p,dmuAmu,FFT::forward);
std::vector<int> mask(Nd,1);
for(int mu=0;mu<Nd;mu++) if (mu==orthog) mask[mu]=0;
theFFT.FFT_dim_mask(dmuAmu_p,dmuAmu,mask,FFT::forward);
//////////////////////////////////
// Work out Fp = psq_max/ psq...
// Avoid singularities in Fp
//////////////////////////////////
std::vector<int> latt_size = grid->GlobalDimensions();
std::vector<int> coor(grid->_ndimension,0);
for(int mu=0;mu<Nd;mu++) {
Real TwoPiL = M_PI * 2.0/ latt_size[mu];
LatticeCoordinate(pmu,mu);
pmu = TwoPiL * pmu ;
psq = psq + 4.0*sin(pmu*0.5)*sin(pmu*0.5);
if ( mu != orthog ) {
Real TwoPiL = M_PI * 2.0/ latt_size[mu];
LatticeCoordinate(pmu,mu);
pmu = TwoPiL * pmu ;
psq = psq + 4.0*sin(pmu*0.5)*sin(pmu*0.5);
}
}
Complex psqMax(16.0);
Fp = psqMax*one/psq;
pokeSite(TComplex(1.0),Fp,coor);
pokeSite(TComplex(16.0),Fp,coor);
if( (orthog>=0) && (orthog<Nd) ){
for(int t=0;t<grid->GlobalDimensions()[orthog];t++){
coor[orthog]=t;
pokeSite(TComplex(16.0),Fp,coor);
}
}
dmuAmu_p = dmuAmu_p * Fp;
theFFT.FFT_all_dim(dmuAmu,dmuAmu_p,FFT::backward);
theFFT.FFT_dim_mask(dmuAmu,dmuAmu_p,mask,FFT::backward);
GaugeMat ciadmam(grid);
Complex cialpha(0.0,-alpha);
@ -183,11 +211,11 @@ class FourierAcceleratedGaugeFixer : public Gimpl {
return trG;
}
static void ExpiAlphaDmuAmu(const std::vector<GaugeMat> &A,GaugeMat &g,Real & alpha, GaugeMat &dmuAmu) {
static void ExpiAlphaDmuAmu(const std::vector<GaugeMat> &A,GaugeMat &g,Real & alpha, GaugeMat &dmuAmu,int orthog) {
GridBase *grid = g._grid;
Complex cialpha(0.0,-alpha);
GaugeMat ciadmam(grid);
DmuAmu(A,dmuAmu);
DmuAmu(A,dmuAmu,orthog);
ciadmam = dmuAmu*cialpha;
SU<Nc>::taExp(ciadmam,g);
}

20
tests/core/Test_fft_gfix.cc
View File

@ -60,6 +60,9 @@ int main (int argc, char ** argv)
std::cout<< "* Testing we can gauge fix steep descent a RGT of Unit gauge *" <<std::endl;
std::cout<< "*****************************************************************" <<std::endl;
// int coulomb_dir = -1;
int coulomb_dir = Nd-1;
LatticeGaugeField Umu(&GRID);
LatticeGaugeField Urnd(&GRID);
LatticeGaugeField Uorg(&GRID);
@ -68,6 +71,7 @@ int main (int argc, char ** argv)
LatticeColourMatrix xform1(&GRID); // Gauge xform
LatticeColourMatrix xform2(&GRID); // Gauge xform
LatticeColourMatrix xform3(&GRID); // Gauge xform
SU3::ColdConfiguration(pRNG,Umu); // Unit gauge
Uorg=Umu;
@ -127,6 +131,22 @@ int main (int argc, char ** argv)
plaq=WilsonLoops<PeriodicGimplR>::avgPlaquette(Umu);
std::cout << " Final plaquette "<<plaq << std::endl;
std::cout<< "*****************************************************************" <<std::endl;
std::cout<< "* Testing Fourier accelerated fixing to coulomb gauge *" <<std::endl;
std::cout<< "*****************************************************************" <<std::endl;
Umu=Urnd;
SU3::HotConfiguration(pRNG,Umu); // Unit gauge
plaq=WilsonLoops<PeriodicGimplR>::avgPlaquette(Umu);
std::cout << " Initial plaquette "<<plaq << std::endl;
FourierAcceleratedGaugeFixer<PeriodicGimplR>::SteepestDescentGaugeFix(Umu,xform3,alpha,10000,1.0e-12, 1.0e-12,true,coulomb_dir);
std::cout << Umu<<std::endl;
plaq=WilsonLoops<PeriodicGimplR>::avgPlaquette(Umu);
std::cout << " Final plaquette "<<plaq << std::endl;
Grid_finalize();
}