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https://github.com/paboyle/Grid.git
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89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
#include <Global.hpp>
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#include <WilsonLoops.h>
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using namespace Grid;
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using namespace QCD;
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using namespace QedFVol;
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typedef PeriodicGaugeImpl<QedGimplR> QedPeriodicGimplR;
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typedef PhotonR::GaugeField EmField;
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typedef PhotonR::GaugeLinkField EmComp;
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const int NCONFIGS = 10;
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const int NWILSON = 10;
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int main(int argc, char *argv[])
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{
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// parse command line
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std::string parameterFileName;
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if (argc < 2)
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{
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std::cerr << "usage: " << argv[0] << " <parameter file> [Grid options]";
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std::cerr << std::endl;
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std::exit(EXIT_FAILURE);
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}
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parameterFileName = argv[1];
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// initialization
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Grid_init(&argc, &argv);
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QedFVolLogError.Active(GridLogError.isActive());
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QedFVolLogWarning.Active(GridLogWarning.isActive());
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QedFVolLogMessage.Active(GridLogMessage.isActive());
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QedFVolLogIterative.Active(GridLogIterative.isActive());
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QedFVolLogDebug.Active(GridLogDebug.isActive());
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LOG(Message) << "Grid initialized" << std::endl;
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// QED stuff
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std::vector<int> latt_size = GridDefaultLatt();
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std::vector<int> simd_layout = GridDefaultSimd(4, vComplex::Nsimd());
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std::vector<int> mpi_layout = GridDefaultMpi();
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GridCartesian grid(latt_size,simd_layout,mpi_layout);
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GridParallelRNG pRNG(&grid);
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PhotonR photon(PhotonR::Gauge::feynman,
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PhotonR::ZmScheme::qedL);
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EmField a(&grid);
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EmField expA(&grid);
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Complex imag_unit(0, 1);
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Real wlA;
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std::vector<Real> logWlAvg(NWILSON, 0.0), logWlTime(NWILSON, 0.0), logWlSpace(NWILSON, 0.0);
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pRNG.SeedRandomDevice();
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LOG(Message) << "Wilson loop calculation beginning" << std::endl;
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for(int ic = 0; ic < NCONFIGS; ic++){
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LOG(Message) << "Configuration " << ic <<std::endl;
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photon.StochasticField(a, pRNG);
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// Exponentiate photon field
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expA = exp(imag_unit*a);
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// Calculate Wilson loops
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for(int iw=1; iw<=NWILSON; iw++){
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wlA = NewWilsonLoops<QedPeriodicGimplR>::avgWilsonLoop(expA, iw, iw) * 3;
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logWlAvg[iw-1] -= 2*log(wlA);
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wlA = NewWilsonLoops<QedPeriodicGimplR>::avgTimelikeWilsonLoop(expA, iw, iw) * 3;
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logWlTime[iw-1] -= 2*log(wlA);
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wlA = NewWilsonLoops<QedPeriodicGimplR>::avgSpatialWilsonLoop(expA, iw, iw) * 3;
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logWlSpace[iw-1] -= 2*log(wlA);
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}
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}
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LOG(Message) << "Wilson loop calculation completed" << std::endl;
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// Calculate Wilson loops
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for(int iw=1; iw<=10; iw++){
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LOG(Message) << iw << 'x' << iw << " Wilson loop" << std::endl;
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LOG(Message) << "-2log(W) average: " << logWlAvg[iw-1]/NCONFIGS << std::endl;
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LOG(Message) << "-2log(W) timelike: " << logWlTime[iw-1]/NCONFIGS << std::endl;
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LOG(Message) << "-2log(W) spatial: " << logWlSpace[iw-1]/NCONFIGS << std::endl;
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}
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// epilogue
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LOG(Message) << "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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