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212 lines
6.6 KiB
C++
212 lines
6.6 KiB
C++
#include <Grid/Hadrons/Modules/MScalar/ChargedProp.hpp>
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#include <Grid/Hadrons/Modules/MScalar/Scalar.hpp>
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using namespace Grid;
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using namespace Hadrons;
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using namespace MScalar;
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/******************************************************************************
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* TChargedProp implementation *
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******************************************************************************/
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// constructor /////////////////////////////////////////////////////////////////
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TChargedProp::TChargedProp(const std::string name)
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: Module<ChargedPropPar>(name)
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{}
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// dependencies/products ///////////////////////////////////////////////////////
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std::vector<std::string> TChargedProp::getInput(void)
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{
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std::vector<std::string> in = {par().source, par().emField};
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return in;
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}
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std::vector<std::string> TChargedProp::getOutput(void)
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{
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std::vector<std::string> out = {getName()};
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return out;
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}
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// setup ///////////////////////////////////////////////////////////////////////
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void TChargedProp::setup(void)
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{
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freeMomPropName_ = FREEMOMPROP(par().mass);
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phaseName_.clear();
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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phaseName_.push_back("_shiftphase_" + std::to_string(mu));
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}
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GFSrcName_ = "_" + getName() + "_DinvSrc";
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if (!env().hasRegisteredObject(freeMomPropName_))
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{
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env().registerLattice<ScalarField>(freeMomPropName_);
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}
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if (!env().hasRegisteredObject(phaseName_[0]))
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{
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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env().registerLattice<ScalarField>(phaseName_[mu]);
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}
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}
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if (!env().hasRegisteredObject(GFSrcName_))
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{
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env().registerLattice<ScalarField>(GFSrcName_);
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}
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env().registerLattice<ScalarField>(getName());
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}
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// execution ///////////////////////////////////////////////////////////////////
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void TChargedProp::execute(void)
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{
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// CACHING ANALYTIC EXPRESSIONS
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ScalarField &source = *env().getObject<ScalarField>(par().source);
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Complex ci(0.0,1.0);
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FFT fft(env().getGrid());
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// cache free scalar propagator
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if (!env().hasCreatedObject(freeMomPropName_))
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{
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LOG(Message) << "Caching momentum space free scalar propagator"
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<< " (mass= " << par().mass << ")..." << std::endl;
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freeMomProp_ = env().createLattice<ScalarField>(freeMomPropName_);
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Scalar<SIMPL>::MomentumSpacePropagator(*freeMomProp_, par().mass);
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}
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else
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{
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freeMomProp_ = env().getObject<ScalarField>(freeMomPropName_);
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}
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// cache G*F*src
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if (!env().hasCreatedObject(GFSrcName_))
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{
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GFSrc_ = env().createLattice<ScalarField>(GFSrcName_);
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fft.FFT_all_dim(*GFSrc_, source, FFT::forward);
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*GFSrc_ = (*freeMomProp_)*(*GFSrc_);
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}
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else
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{
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GFSrc_ = env().getObject<ScalarField>(GFSrcName_);
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}
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// cache phases
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if (!env().hasCreatedObject(phaseName_[0]))
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{
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std::vector<int> &l = env().getGrid()->_fdimensions;
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LOG(Message) << "Caching shift phases..." << std::endl;
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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Real twoPiL = M_PI*2./l[mu];
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phase_.push_back(env().createLattice<ScalarField>(phaseName_[mu]));
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LatticeCoordinate(*(phase_[mu]), mu);
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*(phase_[mu]) = exp(ci*twoPiL*(*(phase_[mu])));
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}
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}
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else
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{
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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phase_.push_back(env().getObject<ScalarField>(phaseName_[mu]));
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}
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}
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// PROPAGATOR CALCULATION
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LOG(Message) << "Computing charged scalar propagator"
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<< " (mass= " << par().mass
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<< ", charge= " << par().charge << ")..." << std::endl;
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ScalarField &prop = *env().createLattice<ScalarField>(getName());
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ScalarField buf(env().getGrid());
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ScalarField &GFSrc = *GFSrc_, &G = *freeMomProp_;
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double q = par().charge;
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// G*F*Src
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prop = GFSrc;
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// - q*G*momD1*G*F*Src (momD1 = F*D1*Finv)
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buf = GFSrc;
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momD1(buf, fft);
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buf = G*buf;
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prop = prop - q*buf;
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// + q^2*G*momD1*G*momD1*G*F*Src (here buf = G*momD1*G*F*Src)
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momD1(buf, fft);
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prop = prop + q*q*G*buf;
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// + q^2*G*momD2*G*F*Src (momD1 = F*D2*Finv)
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buf = GFSrc;
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momD2(buf, fft);
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prop = prop + q*q*G*buf;
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// final FT
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fft.FFT_all_dim(prop, prop, FFT::backward);
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// OUTPUT IF NECESSARY
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if (!par().output.empty())
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{
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std::string filename = par().output + "." +
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std::to_string(env().getTrajectory());
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LOG(Message) << "Saving zero-momentum projection to '"
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<< filename << "'..." << std::endl;
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TextWriter writer(filename);
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std::vector<TComplex> vecBuf;
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std::vector<Complex> result;
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sliceSum(prop, vecBuf, Tp);
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result.resize(vecBuf.size());
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for (unsigned int t = 0; t < vecBuf.size(); ++t)
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{
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result[t] = TensorRemove(vecBuf[t]);
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}
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write(writer, "prop", result);
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}
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}
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void TChargedProp::momD1(ScalarField &s, FFT &fft)
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{
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EmField &A = *env().getObject<EmField>(par().emField);
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ScalarField buf(env().getGrid()), Amu(env().getGrid());
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Complex ci(0.0,1.0);
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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Amu = peekLorentz(A, mu);
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fft.FFT_all_dim(buf, s, FFT::backward);
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buf = Amu*buf;
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fft.FFT_all_dim(buf, buf, FFT::forward);
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s = s + ci*adj(*phase_[mu])*buf;
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}
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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Amu = peekLorentz(A, mu);
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buf = (*phase_[mu])*s;
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fft.FFT_all_dim(buf, buf, FFT::backward);
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buf = Amu*buf;
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fft.FFT_all_dim(buf, buf, FFT::forward);
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s = s - ci*buf;
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}
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}
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void TChargedProp::momD2(ScalarField &s, FFT &fft)
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{
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EmField &A = *env().getObject<EmField>(par().emField);
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ScalarField buf(env().getGrid()), Amu(env().getGrid());
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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Amu = peekLorentz(A, mu);
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fft.FFT_all_dim(buf, s, FFT::backward);
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buf = Amu*Amu*buf;
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fft.FFT_all_dim(buf, buf, FFT::forward);
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s = s + .5*adj(*phase_[mu])*buf;
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}
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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Amu = peekLorentz(A, mu);
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buf = (*phase_[mu])*s;
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fft.FFT_all_dim(buf, buf, FFT::backward);
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buf = Amu*Amu*buf;
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fft.FFT_all_dim(buf, buf, FFT::forward);
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s = s + .5*buf;
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}
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}
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