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https://github.com/paboyle/Grid.git
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109 lines
3.1 KiB
C++
109 lines
3.1 KiB
C++
#include <Grid.h>
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using namespace std;
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using namespace Grid;
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using namespace Grid::QCD;
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template<class d>
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struct scal {
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d internal;
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};
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Gamma::GammaMatrix Gmu [] = {
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Gamma::GammaX,
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Gamma::GammaY,
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Gamma::GammaZ,
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Gamma::GammaT
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};
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int main (int argc, char ** argv)
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{
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Grid_init(&argc,&argv);
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const int Ls=8;
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GridCartesian * UGrid = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(), GridDefaultSimd(Nd,vComplexF::Nsimd()),GridDefaultMpi());
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GridRedBlackCartesian * UrbGrid = SpaceTimeGrid::makeFourDimRedBlackGrid(UGrid);
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GridCartesian * FGrid = SpaceTimeGrid::makeFiveDimGrid(Ls,UGrid);
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GridRedBlackCartesian * FrbGrid = SpaceTimeGrid::makeFiveDimRedBlackGrid(Ls,UGrid);
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// Construct a coarsened grid
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std::vector<int> clatt = GridDefaultLatt();
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for(int d=0;d<clatt.size();d++){
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clatt[d] = clatt[d]/2;
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}
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GridCartesian *Coarse4d = SpaceTimeGrid::makeFourDimGrid(clatt, GridDefaultSimd(Nd,vComplexF::Nsimd()),GridDefaultMpi());;
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GridCartesian *Coarse5d = SpaceTimeGrid::makeFiveDimGrid(1,Coarse4d);
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std::vector<int> seeds4({1,2,3,4});
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std::vector<int> seeds5({5,6,7,8});
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GridParallelRNG RNG5(FGrid); RNG5.SeedFixedIntegers(seeds5);
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GridParallelRNG RNG4(UGrid); RNG4.SeedFixedIntegers(seeds4);
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LatticeFermion src(FGrid); random(RNG5,src);
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LatticeFermion result(FGrid); result=zero;
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LatticeFermion ref(FGrid); ref=zero;
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LatticeFermion tmp(FGrid);
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LatticeFermion err(FGrid);
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LatticeGaugeField Umu(UGrid); random(RNG4,Umu);
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std::vector<LatticeColourMatrix> U(4,UGrid);
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for(int mu=0;mu<Nd;mu++){
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U[mu] = peekIndex<LorentzIndex>(Umu,mu);
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}
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RealD mass=0.5;
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RealD M5=1.8;
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DomainWallFermion Ddwf(Umu,*FGrid,*FrbGrid,*UGrid,*UrbGrid,mass,M5);
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Gamma5HermitianLinearOperator<DomainWallFermion,LatticeFermion> HermIndefOp(Ddwf);
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HermIndefOp.Op(src,ref);
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HermIndefOp.OpDiag(src,result);
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for(int d=0;d<4;d++){
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HermIndefOp.OpDir(src,tmp,d,+1); result=result+tmp;
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std::cout<<"dir "<<d<<" tmp "<<norm2(tmp)<<std::endl;
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HermIndefOp.OpDir(src,tmp,d,-1); result=result+tmp;
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std::cout<<"dir "<<d<<" tmp "<<norm2(tmp)<<std::endl;
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}
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err = result-ref;
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std::cout<<"Error "<<norm2(err)<<std::endl;
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const int nbasis = 8;
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std::vector<LatticeFermion> subspace(nbasis,FGrid);
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for(int b=0;b<nbasis;b++){
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random(RNG5,subspace[b]);
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}
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std::cout << "Computed randoms"<< std::endl;
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CoarsenedMatrix<vSpinColourVector,vTComplex,nbasis> LittleDiracOp(*Coarse5d);
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LittleDiracOp.CoarsenOperator(FGrid,HermIndefOp,subspace);
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typedef Lattice<iVector<vComplex,nbasis > > coarse_vec;
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coarse_vec c_src (Coarse5d); c_src= zero;
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coarse_vec c_res (Coarse5d);
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Complex one(1.0);
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c_src = one; // 1 in every element for vector 1.
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// TODO
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// -- promote from subspace, check we get the vector we wanted
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// -- apply ldop; check we get the same as inner product of M times big vec
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// -- pick blocks one by one. Evaluate matrix elements.
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std::cout << "Multiplying by LittleDiracOp "<< std::endl;
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LittleDiracOp.M(c_src,c_res);
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std::cout << "Done "<< std::endl;
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Grid_finalize();
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}
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