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311 lines
9.8 KiB
C++
311 lines
9.8 KiB
C++
#include <Grid/Hadrons/Modules/MScalar/ScalarVP.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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* TScalarVP implementation *
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******************************************************************************/
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// constructor /////////////////////////////////////////////////////////////////
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TScalarVP::TScalarVP(const std::string name)
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: Module<ScalarVPPar>(name)
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{}
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// dependencies/products ///////////////////////////////////////////////////////
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std::vector<std::string> TScalarVP::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> TScalarVP::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 TScalarVP::setup(void)
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{
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freeMomPropName_ = FREEMOMPROP(par().mass);
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GFSrcName_ = "_" + getName() + "_DinvSrc";
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prop0Name_ = getName() + "_prop0";
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propQName_ = getName() + "_propQ";
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propSunName_ = getName() + "_propSun";
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propTadName_ = getName() + "_propTad";
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phaseName_.clear();
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muGFSrcName_.clear();
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muProp0Name_.clear();
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muPropQName_.clear();
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muPropSunName_.clear();
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muPropTadName_.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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muGFSrcName.push_back("_" + getName() + "_DinvSrc_" + std::to_string(mu));
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muProp0Name_.push_back(getName() + "_prop0_" + std::to_string(mu));
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muPropQName_.push_back(getName() + "_propQ_" + std::to_string(mu));
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muPropSunName_.push_back(getName() + "_propSun_" + std::to_string(mu));
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muPropTadName_.push_back(getName() + "_propTad_" + std::to_string(mu));
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}
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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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if (!env().hasRegisteredObject(muGFSrcName_[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>(muGFSrcName_[mu]);
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}
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}
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if (!env().hasRegisteredObject(prop0Name_))
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{
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env().registerLattice<ScalarField>(prop0Name_);
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}
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if (!env().hasRegisteredObject(muProp0Name_[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>(muProp0Name_[mu]);
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}
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}
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env().registerLattice<ScalarField>(propQName_);
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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env().registerLattice<ScalarField>(muPropQName_[mu]);
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}
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env().registerLattice<ScalarField>(propSunName_);
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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env().registerLattice<ScalarField>(muPropSunName_[mu]);
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}
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env().registerLattice<ScalarField>(propTadName_);
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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env().registerLattice<ScalarField>(muPropTadName_[mu]);
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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 TScalarVP::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 momentum-space 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 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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// 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 G*exp(i*k_mu)*F*src
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if (!env().hasCreatedObject(muGFSrcName_[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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muGFSrc_.push_back(env().createLattice<ScalarField>(muGFSrcName_[mu]));
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fft.FFT_all_dim(*(muGFSrc_[mu]), source, FFT::forward);
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*(muGFSrc_[mu]) = (*freeMomProp_)*(*phase_[mu])*(*muGFSrc_[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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muGFSrc_.push_back(env().getObject<ScalarField>(muGFSrcName_[mu]));
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}
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}
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// cache position-space free scalar propagators
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if (!env().hasCreatedObject(prop0Name_))
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{
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prop0_ = env().createLattice<ScalarField>(prop0Name_);
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fft.FFT_all_dim(*prop0_, *GFSrc_, FFT::backward);
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}
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else
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{
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prop0_ = env().getObject<ScalarField>(prop0Name_);
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}
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if (!env().hasCreatedObject(muProp0Name_[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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muProp0_.push_back(env().createLattice<ScalarField>(muProp0Name_[mu]));
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fft.FFT_all_dim(*(muProp0_[mu]), *(muGFSrc_[mu]), FFT::backward);
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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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muProp0_.push_back(env().getObject<ScalarField>(muProp0Name_[mu]));
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}
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}
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// PROPAGATOR CALCULATION
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// Propagator from unshifted source
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ScalarField &propQ = *env().createLattice<ScalarField>(propQName_);
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ScalarField &propSun = *env().createLattice<ScalarField>(propSunName_);
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ScalarField &propTad = *env().createLattice<ScalarField>(propTadName_);
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chargedProp(propQ, propSun, propTad, *GFSrc_, fft);
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// Propagators from shifted sources
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std::vector<ScalarField *> muPropQ_, muPropSun_, muPropTad_;
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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muPropQ_.push_back(env().createLattice<ScalarField>(muPropQName_[mu]));
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muPropSun_.push_back(env().createLattice<ScalarField>(muPropSunName_[mu]));
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muPropTad_.push_back(env().createLattice<ScalarField>(muPropTadName_[mu]));
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chargedProp(*(muPropQ_[mu]), *(muPropSun_[mu]), *(muPropTad_[mu]),
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*(muGFSrc_[mu]), fft);
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}
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}
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// Calculate O(q) and O(q^2) terms of momentum-space charged propagator
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void TScalarVP::chargedProp(ScalarField &prop_q, ScalarField &prop_sun,
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ScalarField &prop_tad, ScalarField &GFSrc,
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FFT &fft)
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{
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Complex ci(0.0,1.0);
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double q = par().charge;
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ScalarField &G = *freeMomProp_;
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ScalarField buf(env().getGrid());
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LOG(Message) << "Computing charged scalar propagator"
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<< " (mass= " << par().mass
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<< ", charge= " << q << ")..." << std::endl;
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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_q = -q*buf;
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// q*q*G*momD1*G*momD1*G*F*Src
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momD1(buf, fft);
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prop_sun = q*q*G*buf;
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// -q*q*G*momD2*G*F*Src (momD2 = F*D2*Finv)
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buf = GFSrc;
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momD2(buf, fft);
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prop_tad = -q*q*G*buf;
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}
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void TScalarVP::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()), result(env().getGrid()),
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Amu(env().getGrid());
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Complex ci(0.0,1.0);
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result = zero;
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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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result = result - ci*buf;
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}
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fft.FFT_all_dim(s, s, FFT::backward);
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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 = Amu*s;
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fft.FFT_all_dim(buf, buf, FFT::forward);
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result = result + ci*adj(*phase_[mu])*buf;
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}
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s = result;
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}
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void TScalarVP::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()), result(env().getGrid()),
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Amu(env().getGrid());
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result = zero;
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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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result = result + .5*buf;
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}
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fft.FFT_all_dim(s, s, FFT::backward);
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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 = Amu*Amu*s;
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fft.FFT_all_dim(buf, buf, FFT::forward);
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result = result + .5*adj(*phase_[mu])*buf;
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}
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s = result;
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}
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