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twist and boundary conditions for free propagator

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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
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27
Grid/qcd/action/fermion/DomainWallFermion.h
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@@ -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
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@@ -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);
};
///////////////////////////////////////////////

19
Hadrons/Modules/MFermion/EMLepton.hpp
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@@ -72,6 +72,7 @@ public:
std::string, action,
std::string, emField,
double, mass,
std::string , boundary,
std::string, twist,
unsigned int, deltat);
};
@@ -163,8 +164,7 @@ void TEMLepton<FImpl>::execute(void)
envGetTmp(FermionField, sol);
envGetTmp(FermionField, tmp);
LOG(Message) << "Calculating a lepton Propagator with sequential Aslash insertion with lepton mass "
<< mass << " and twist ("
<< par().twist << ") using the action '" << par().action
<< mass << " using the action '" << par().action
<< "' for fixed source-sink separation of " << par().deltat << std::endl;
envGetTmp(Lattice<iScalar<vInteger>>, tlat);
@@ -176,6 +176,11 @@ void TEMLepton<FImpl>::execute(void)
{
HADRONS_ERROR(Size, "number of twist angles does not match number of dimensions");
}
std::vector<Complex> boundary = strToVec<Complex>(par().boundary);
if(boundary.size() != Nd)
{
HADRONS_ERROR(Size, "number of boundary conditions does not match number of dimensions");
}
auto &stoch_photon = envGet(EmField, par().emField);
unsigned int nt = env().getDim(Tp);
@@ -212,7 +217,7 @@ void TEMLepton<FImpl>::execute(void)
mat.ImportPhysicalFermionSource(tmp, source);
}
sol = zero;
mat.FreePropagator(source,sol,mass,twist);
mat.FreePropagator(source,sol,mass,boundary,twist);
if (Ls_ == 1)
{
FermToProp<FImpl>(freetmp, sol, s, 0);
@@ -229,11 +234,7 @@ void TEMLepton<FImpl>::execute(void)
//shift free propagator to different source positions
proptmp = Cshift(freetmp,Tp, -tl);
//take anti-periodic boundary conditions into account, if used
if(twist[Tp]==0.5)
{
proptmp = where( tlat < tl, (-1.0)*proptmp, proptmp);
}
proptmp = where( tlat < tl, boundary[Tp]*proptmp, proptmp);
// free propagator for fixed source-sink separation
lep = where(tlat == (tl-par().deltat+nt)%nt, proptmp, lep);
@@ -264,7 +265,7 @@ void TEMLepton<FImpl>::execute(void)
mat.ImportPhysicalFermionSource(tmp, source);
}
sol = zero;
mat.FreePropagator(source,sol,mass,twist);
mat.FreePropagator(source,sol,mass,boundary,twist);
if (Ls_ == 1)
{
FermToProp<FImpl>(proptmp, sol, s, 0);

8
Hadrons/Modules/MFermion/FreeProp.hpp
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@@ -49,6 +49,7 @@ public:
std::string, source,
std::string, action,
double, mass,
std::string , boundary,
std::string, twist);
};
@@ -172,7 +173,12 @@ void TFreeProp<FImpl>::execute(void)
{
HADRONS_ERROR(Size, "number of twist angles does not match number of dimensions");
}
mat.FreePropagator(source,sol,mass,twist);
std::vector<Complex> boundary = strToVec<Complex>(par().boundary);
if(boundary.size() != Nd)
{
HADRONS_ERROR(Size, "number of boundary conditions does not match number of dimensions");
}
mat.FreePropagator(source,sol,mass,boundary,twist);
FermToProp<FImpl>(prop, sol, s, c);
// create 4D propagators from 5D one if necessary
if (Ls_ > 1)