portelli/Grid
1
0
Fork 0
mirror of https://github.com/paboyle/Grid.git synced 2025-06-18 15:57:05 +01:00
Code Releases Activity

twist and boundary conditions for free propagator

Browse Source
This commit is contained in:
Vera Guelpers
2019-04-05 10:08:27 +01:00
parent 84940fbdf0
commit 00963a7499
4 changed files with 46 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
Grid/qcd/action/fermion/DomainWallFermion.h
View File

@ -43,7 +43,7 @@ namespace Grid {
INHERIT_IMPL_TYPES(Impl);
public:
void FreePropagator(const FermionField &in,FermionField &out,RealD mass, std::vector<double> twist, bool fiveD) {
void FreePropagator(const FermionField &in,FermionField &out,RealD mass,std::vector<Complex> boundary, std::vector<double> twist, bool fiveD) {
FermionField in_k(in._grid);
FermionField prop_k(in._grid);
@ -55,15 +55,19 @@ namespace Grid {
FermionField in_buf(in._grid); in_buf = zero;
Complex ci(0.0,1.0);
assert(twist.size() == Nd);//check that twist is Nd
assert(boundary.size() == Nd);//check that boundary conditions is Nd
int shift = 0;
if(fiveD) shift = 1;
for(unsigned int nu = 0; nu < Nd; nu++)
{
// Shift coordinate lattice index by 1 to account for 5th dimension.
LatticeCoordinate(coor, nu + shift);
ph = ph + twist[nu]*coor*((1./(in._grid->_fdimensions[nu+shift])));
double boundary_phase = ::acos(real(boundary[nu]));
ph = ph + boundary_phase*coor*((1./(in._grid->_fdimensions[nu+shift])));
//momenta for propagator shifted by twist+boundary
twist[nu] = twist[nu] + boundary_phase/((2.0*M_PI));
}
in_buf = exp((Real)(2.0*M_PI)*ci*ph*(-1.0))*in;
in_buf = exp(ci*ph*(-1.0))*in;
if(fiveD){//FFT only on temporal and spatial dimensions
std::vector<int> mask(Nd+1,1); mask[0] = 0;
@ -76,25 +80,28 @@ namespace Grid {
this->MomentumSpacePropagatorHt(prop_k,in_k,mass,twist);
theFFT.FFT_all_dim(out,prop_k,FFT::backward);
}
//phase for boundary condition
out = out * exp((Real)(2.0*M_PI)*ci*ph);
out = out * exp(ci*ph);
};
virtual void FreePropagator(const FermionField &in,FermionField &out,RealD mass,std::vector<double> twist) {
virtual void FreePropagator(const FermionField &in,FermionField &out,RealD mass,std::vector<Complex> boundary,std::vector<double> twist) {
bool fiveD = true; //5d propagator by default
FreePropagator(in,out,mass,twist,fiveD);
FreePropagator(in,out,mass,boundary,twist,fiveD);
};
virtual void FreePropagator(const FermionField &in,FermionField &out,RealD mass, bool fiveD) {
std::vector<double> twist(Nd,0.0); //default: periodic boundarys in all directions
FreePropagator(in,out,mass,twist,fiveD);
std::vector<Complex> boundary;
for(int i=0;i<Nd;i++) boundary.push_back(1);//default: periodic boundary conditions
FreePropagator(in,out,mass,boundary,twist,fiveD);
};
virtual void FreePropagator(const FermionField &in,FermionField &out,RealD mass) {
bool fiveD = true; //5d propagator by default
std::vector<double> twist(Nd,0.0); //default: periodic boundarys in all directions
FreePropagator(in,out,mass,twist,fiveD);
std::vector<double> twist(Nd,0.0); //default: twist angle 0
std::vector<Complex> boundary;
for(int i=0;i<Nd;i++) boundary.push_back(1); //default: periodic boundary conditions
FreePropagator(in,out,mass,boundary,twist,fiveD);
};
virtual void Instantiatable(void) {};

17
Grid/qcd/action/fermion/FermionOperator.h
View File

@ -96,7 +96,7 @@ namespace Grid {
virtual void MomentumSpacePropagator(FermionField &out,const FermionField &in,RealD _m,std::vector<double> twist) { assert(0);};
virtual void FreePropagator(const FermionField &in,FermionField &out,RealD mass,std::vector<double> twist) {
virtual void FreePropagator(const FermionField &in,FermionField &out,RealD mass,std::vector<Complex> boundary,std::vector<double> twist) {
FFT theFFT((GridCartesian *) in._grid);
FermionField in_k(in._grid);
@ -108,24 +108,31 @@ namespace Grid {
FermionField in_buf(in._grid); in_buf = zero;
Complex ci(0.0,1.0);
assert(twist.size() == Nd);//check that twist is Nd
assert(boundary.size() == Nd);//check that boundary conditions is Nd
for(unsigned int nu = 0; nu < Nd; nu++)
{
LatticeCoordinate(coor, nu);
ph = ph + twist[nu]*coor*((1./(in._grid->_fdimensions[nu])));
double boundary_phase = ::acos(real(boundary[nu]));
ph = ph + boundary_phase*coor*((1./(in._grid->_fdimensions[nu])));
//momenta for propagator shifted by twist+boundary
twist[nu] = twist[nu] + boundary_phase/((2.0*M_PI));
}
in_buf = exp((Real)(2.0*M_PI)*ci*ph*(-1.0))*in;
in_buf = exp(ci*ph*(-1.0))*in;
theFFT.FFT_all_dim(in_k,in_buf,FFT::forward);
this->MomentumSpacePropagator(prop_k,in_k,mass,twist);
theFFT.FFT_all_dim(out,prop_k,FFT::backward);
//phase for boundary condition
out = out * exp((Real)(2.0*M_PI)*ci*ph);
out = out * exp(ci*ph);
};
virtual void FreePropagator(const FermionField &in,FermionField &out,RealD mass) {
std::vector<Complex> boundary;
for(int i=0;i<Nd;i++) boundary.push_back(1);//default: periodic boundary conditions
std::vector<double> twist(Nd,0.0); //default: periodic boundarys in all directions
FreePropagator(in,out,mass,twist);
FreePropagator(in,out,mass,boundary,twist);
};
///////////////////////////////////////////////