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Boosted fermion attempt

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This commit is contained in:
Peter Boyle
2024-10-17 18:36:32 +01:00
parent e29b97b3ea
commit 6815e138b4
5 changed files with 344 additions and 43 deletions
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44
Grid/qcd/action/fermion/ContinuedFractionFermion5D.h
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@ -60,6 +60,50 @@ public:
// virtual void Instantiatable(void)=0;
virtual void Instantiatable(void) =0;
void FreePropagator(const FermionField &in,FermionField &out,RealD mass,std::vector<Complex> boundary, std::vector<double> twist)
{
std::cout << "Free Propagator for PartialFraction"<<std::endl;
FermionField in_k(in.Grid());
FermionField prop_k(in.Grid());
FFT theFFT((GridCartesian *) in.Grid());
//phase for boundary condition
ComplexField coor(in.Grid());
ComplexField ph(in.Grid()); ph = Zero();
FermionField in_buf(in.Grid()); in_buf = Zero();
typedef typename Simd::scalar_type Scalar;
Scalar 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;
for(unsigned int nu = 0; nu < Nd; nu++)
{
// Shift coordinate lattice index by 1 to account for 5th dimension.
LatticeCoordinate(coor, 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(ci*ph*(-1.0))*in;
theFFT.FFT_all_dim(in_k,in,FFT::forward);
this->MomentumSpacePropagatorHw(prop_k,in_k,mass,twist);
theFFT.FFT_all_dim(out,prop_k,FFT::backward);
//phase for boundary condition
out = out * exp(ci*ph);
};
virtual void FreePropagator(const FermionField &in,FermionField &out,RealD mass) {
std::vector<double> twist(Nd,0.0); //default: periodic boundarys in all directions
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);
};
// Efficient support for multigrid coarsening
virtual void Mdir (const FermionField &in, FermionField &out,int dir,int disp);
virtual void MdirAll(const FermionField &in, std::vector<FermionField> &out);

53
Grid/qcd/action/fermion/PartialFractionFermion5D.h
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@ -39,7 +39,7 @@ class PartialFractionFermion5D : public WilsonFermion5D<Impl>
public:
INHERIT_IMPL_TYPES(Impl);
const int part_frac_chroma_convention=1;
const int part_frac_chroma_convention=0;
void Meooe_internal(const FermionField &in, FermionField &out,int dag);
void Mooee_internal(const FermionField &in, FermionField &out,int dag);
@ -83,12 +83,63 @@ public:
GridRedBlackCartesian &FourDimRedBlackGrid,
RealD _mass,RealD M5,const ImplParams &p= ImplParams());
PartialFractionFermion5D(GaugeField &_Umu,
GridCartesian &FiveDimGrid,
GridRedBlackCartesian &FiveDimRedBlackGrid,
GridCartesian &FourDimGrid,
GridRedBlackCartesian &FourDimRedBlackGrid,
RealD _mass,RealD M5,std::vector<RealD> &_qmu,const ImplParams &p= ImplParams());
void FreePropagator(const FermionField &in,FermionField &out,RealD mass,std::vector<Complex> boundary, std::vector<double> twist)
{
std::cout << "Free Propagator for PartialFraction"<<std::endl;
FermionField in_k(in.Grid());
FermionField prop_k(in.Grid());
FFT theFFT((GridCartesian *) in.Grid());
//phase for boundary condition
ComplexField coor(in.Grid());
ComplexField ph(in.Grid()); ph = Zero();
FermionField in_buf(in.Grid()); in_buf = Zero();
typedef typename Simd::scalar_type Scalar;
Scalar 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;
for(unsigned int nu = 0; nu < Nd; nu++)
{
// Shift coordinate lattice index by 1 to account for 5th dimension.
LatticeCoordinate(coor, 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(ci*ph*(-1.0))*in;
theFFT.FFT_all_dim(in_k,in,FFT::forward);
this->MomentumSpacePropagatorHw(prop_k,in_k,mass,twist);
theFFT.FFT_all_dim(out,prop_k,FFT::backward);
//phase for boundary condition
out = out * exp(ci*ph);
};
virtual void FreePropagator(const FermionField &in,FermionField &out,RealD mass) {
std::vector<double> twist(Nd,0.0); //default: periodic boundarys in all directions
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);
};
protected:
virtual void SetCoefficientsTanh(Approx::zolotarev_data *zdata,RealD scale);
virtual void SetCoefficientsZolotarev(RealD zolo_hi,Approx::zolotarev_data *zdata);
// Part frac
std::vector<RealD> qmu;
RealD mass;
RealD dw_diag;
RealD R;

16
Grid/qcd/action/fermion/implementation/ContinuedFractionFermion5DImplementation.h
View File

@ -42,13 +42,13 @@ template<class Impl>
void ContinuedFractionFermion5D<Impl>::SetCoefficientsZolotarev(RealD zolo_hi,Approx::zolotarev_data *zdata)
{
// How to check Ls matches??
// std::cout<<GridLogMessage << Ls << " Ls"<<std::endl;
// std::cout<<GridLogMessage << zdata->n << " - n"<<std::endl;
// std::cout<<GridLogMessage << zdata->da << " -da "<<std::endl;
// std::cout<<GridLogMessage << zdata->db << " -db"<<std::endl;
// std::cout<<GridLogMessage << zdata->dn << " -dn"<<std::endl;
// std::cout<<GridLogMessage << zdata->dd << " -dd"<<std::endl;
std::cout<<GridLogMessage << zdata->n << " - n"<<std::endl;
std::cout<<GridLogMessage << zdata->da << " -da "<<std::endl;
std::cout<<GridLogMessage << zdata->db << " -db"<<std::endl;
std::cout<<GridLogMessage << zdata->dn << " -dn"<<std::endl;
std::cout<<GridLogMessage << zdata->dd << " -dd"<<std::endl;
int Ls = this->Ls;
std::cout<<GridLogMessage << Ls << " Ls"<<std::endl;
assert(zdata->db==Ls);// Beta has Ls coeffs
R=(1+this->mass)/(1-this->mass);
@ -320,7 +320,7 @@ ContinuedFractionFermion5D<Impl>::ContinuedFractionFermion5D(
int Ls = this->Ls;
conformable(solution5d.Grid(),this->FermionGrid());
conformable(exported4d.Grid(),this->GaugeGrid());
ExtractSlice(exported4d, solution5d, Ls-1, Ls-1);
ExtractSlice(exported4d, solution5d, Ls-1, 0);
}
template<class Impl>
void ContinuedFractionFermion5D<Impl>::ImportPhysicalFermionSource(const FermionField &input4d,FermionField &imported5d)
@ -330,7 +330,7 @@ ContinuedFractionFermion5D<Impl>::ContinuedFractionFermion5D(
conformable(input4d.Grid() ,this->GaugeGrid());
FermionField tmp(this->FermionGrid());
tmp=Zero();
InsertSlice(input4d, tmp, Ls-1, Ls-1);
InsertSlice(input4d, tmp, Ls-1, 0);
tmp=Gamma(Gamma::Algebra::Gamma5)*tmp;
this->Dminus(tmp,imported5d);
}

86
Grid/qcd/action/fermion/implementation/PartialFractionFermion5DImplementation.h
View File

@ -255,15 +255,76 @@ void PartialFractionFermion5D<Impl>::M_internal(const FermionField &psi, Fermi
}
{
// The 'conventional' Cayley overlap operator is
//
// Dov = (1+m)/2 + (1-m)/2 g5 sgn Hw
//
//
// With massless limit 1/2(1+g5 sgnHw)
//
// Luscher shows quite neatly that 1+g5 sgn Hw has tree level propagator i qslash +O(a^2)
//
// However, the conventional normalisation has both a leading order factor of 2 in Zq
// at tree level AND a mass dependent (1-m) that are convenient to absorb.
//
// In WilsonFermion5DImplementation.h, the tree level propagator for Hw is
//
// num = -i sin kmu gmu
//
// denom ( sqrt(sk^2 + (2shk^2 - 1)^2
// b_k = sk2 - M5;
//
// w_k = sqrt(sk + b_k*b_k);
//
// denom= ( w_k + b_k + mass*mass) ;
//
// denom= one/denom;
// out = num*denom;
//
// Chroma, and Grid define partial fraction via 4d operator
//
// Dpf = 2/(1-m) x Dov = (1+m)/(1-m) + g5 sgn Hw
//
// Now since:
//
// (1+m)/(1-m) = (1-m)/(1-m) + 2m/(1-m) = 1 + 2m/(1-m)
//
// This corresponds to a modified mass parameter
//
// It has an annoying
//
//
double R=(1+this->mass)/(1-this->mass);
//R g5 psi[Ls] + p[0] H
ag5xpbg5y_ssp(chi,R*scale,psi,p[nblock]*scale/amax,D,Ls-1,Ls-1);
for(int b=0;b<nblock;b++){
int s = 2*b+1;
double pp = p[nblock-1-b];
axpby_ssp(chi,1.0,chi,-sqrt(amax*pp)*scale*sign,psi,Ls-1,s);
}
if ( qmu.size() ) {
FermionField qslash_psi(psi.Grid());
Gamma::Algebra Gmu [] = {
Gamma::Algebra::GammaX,
Gamma::Algebra::GammaY,
Gamma::Algebra::GammaZ,
Gamma::Algebra::GammaT
};
ComplexD ci(0,1);
assert(qmu.size()==Nd);
qslash_psi = Gamma(Gmu[0])*psi;
for(int mu=1;mu<Nd;mu++){
qslash_psi = Gamma(Gmu[mu])*psi;
}
// RealD coeff = 1.0;
qslash_psi = Gamma(Gamma::Algebra::Gamma5)*qslash_psi*ci ; // i g5 qslash -- 1-m factor???
axpby_ssp(chi,1.0,chi,1.0, qslash_psi,Ls-1,Ls-1);
}
}
}
@ -411,7 +472,7 @@ void PartialFractionFermion5D<Impl>::SetCoefficientsZolotarev(RealD zolo_hi,App
int Ls = this->Ls;
conformable(solution5d.Grid(),this->FermionGrid());
conformable(exported4d.Grid(),this->GaugeGrid());
ExtractSlice(exported4d, solution5d, Ls-1, Ls-1);
ExtractSlice(exported4d, solution5d, Ls-1, 0);
}
template<class Impl>
void PartialFractionFermion5D<Impl>::ImportPhysicalFermionSource(const FermionField &input4d,FermionField &imported5d)
@ -421,7 +482,8 @@ void PartialFractionFermion5D<Impl>::SetCoefficientsZolotarev(RealD zolo_hi,App
conformable(input4d.Grid() ,this->GaugeGrid());
FermionField tmp(this->FermionGrid());
tmp=Zero();
InsertSlice(input4d, tmp, Ls-1, Ls-1);
std::cout << " importing to slice " << Ls-1 <<std::endl;
InsertSlice(input4d, tmp, Ls-1, 0);
tmp=Gamma(Gamma::Algebra::Gamma5)*tmp;
this->Dminus(tmp,imported5d);
}
@ -442,7 +504,7 @@ PartialFractionFermion5D<Impl>::PartialFractionFermion5D(GaugeField &_Umu,
{
int Ls = this->Ls;
qmu.resize(0);
assert((Ls&0x1)==1); // Odd Ls required
int nrational=Ls-1;
@ -460,6 +522,22 @@ PartialFractionFermion5D<Impl>::PartialFractionFermion5D(GaugeField &_Umu,
Approx::zolotarev_free(zdata);
}
template<class Impl>
PartialFractionFermion5D<Impl>::PartialFractionFermion5D(GaugeField &_Umu,
GridCartesian &FiveDimGrid,
GridRedBlackCartesian &FiveDimRedBlackGrid,
GridCartesian &FourDimGrid,
GridRedBlackCartesian &FourDimRedBlackGrid,
RealD _mass,RealD M5,
std::vector<RealD> &_qmu,
const ImplParams &p)
: PartialFractionFermion5D<Impl>(_Umu,
FiveDimGrid,FiveDimRedBlackGrid,
FourDimGrid,FourDimRedBlackGrid,
_mass,M5,p)
{
qmu=_qmu;
}
NAMESPACE_END(Grid);