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101 lines
3.1 KiB
C++
101 lines
3.1 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: tests/core/Test_meson_field.cc
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Copyright (C) 2015-2018
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Author: Felix Erben <felix.erben@ed.ac.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution directory
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*************************************************************************************/
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#include <Grid/Grid.h>
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#include <Grid/qcd/utils/A2Autils.h>
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using namespace Grid;
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typedef typename DomainWallFermionR::ComplexField ComplexField;
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typedef typename DomainWallFermionR::FermionField FermionField;
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int main(int argc, char *argv[])
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{
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// initialization
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Grid_init(&argc, &argv);
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std::cout << GridLogMessage << "Grid initialized" << std::endl;
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Coordinate latt_size = GridDefaultLatt();
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Coordinate simd_layout = GridDefaultSimd(4, vComplex::Nsimd());
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Coordinate mpi_layout = GridDefaultMpi();
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GridCartesian grid(latt_size,simd_layout,mpi_layout);
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// MesonField lhs and rhs vectors
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int mfDim = 3;
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std::vector<FermionField> phi(mfDim,&grid);
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std::vector<FermionField> rho(mfDim,&grid);
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std::vector<int> seeds({1,2,3,4});
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GridParallelRNG pRNG(&grid);
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pRNG.SeedFixedIntegers(seeds);
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for (unsigned int i = 0; i < mfDim; ++i){
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random(pRNG,phi[i]);
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random(pRNG,rho[i]); //ideally only nonzero on t=0
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}
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// Gamma matrices used in the contraction
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std::vector<Gamma::Algebra> Gmu = {
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Gamma::Algebra::GammaX,
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Gamma::Algebra::GammaY,
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Gamma::Algebra::GammaZ,
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Gamma::Algebra::GammaT
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};
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// momentum phases e^{ipx}
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std::vector<std::vector<double>> momenta = {
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{0.,0.,0.},
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{1.,0.,0.},
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{1.,1.,0.},
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{1.,1.,1.},
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{2.,0.,0.}
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};
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std::vector<ComplexField> phases(momenta.size(),&grid);
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ComplexField coor(&grid);
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Complex Ci(0.0,1.0);
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for (unsigned int j = 0; j < momenta.size(); ++j)
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{
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phases[j] = Zero();
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for(unsigned int mu = 0; mu < momenta[j].size(); mu++)
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{
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LatticeCoordinate(coor, mu);
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phases[j] = phases[j] + momenta[j][mu]/GridDefaultLatt()[mu]*coor;
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}
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phases[j] = exp((Real)(2*M_PI)*Ci*phases[j]);
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}
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Eigen::Tensor<ComplexD,5, Eigen::RowMajor> mf(momenta.size(),Gmu.size(),GridDefaultLatt()[3],mfDim,mfDim);
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//execute meson field routine
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A2Autils<WilsonImplR>::MesonField(mf,&phi[0],&phi[0],Gmu,phases,3);
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std::cout << mf << std::endl;
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// epilogue
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std::cout << GridLogMessage << "Grid is finalizing now" << std::endl;
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Grid_finalize();
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return EXIT_SUCCESS;
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}
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