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313 lines
11 KiB
C++
313 lines
11 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: Hadrons/Modules/MScalar/ChargedProp.cc
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Copyright (C) 2015-2018
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Author: Antonin Portelli <antonin.portelli@me.com>
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Author: James Harrison <jch1g10@soton.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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/* END LEGAL */
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#include <Hadrons/Modules/MScalar/ChargedProp.hpp>
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#include <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(), getName()+"_0", getName()+"_Q",
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getName()+"_Sun", getName()+"_Tad"};
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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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prop0Name_ = getName() + "_0";
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propQName_ = getName() + "_Q";
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propSunName_ = getName() + "_Sun";
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propTadName_ = getName() + "_Tad";
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fftName_ = getName() + "_fft";
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freeMomPropDone_ = env().hasCreatedObject(freeMomPropName_);
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GFSrcDone_ = env().hasCreatedObject(GFSrcName_);
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phasesDone_ = env().hasCreatedObject(phaseName_[0]);
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prop0Done_ = env().hasCreatedObject(prop0Name_);
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envCacheLat(ScalarField, freeMomPropName_);
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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envCacheLat(ScalarField, phaseName_[mu]);
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}
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envCacheLat(ScalarField, GFSrcName_);
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envCacheLat(ScalarField, prop0Name_);
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envCreateLat(ScalarField, getName());
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envCreateLat(ScalarField, propQName_);
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envCreateLat(ScalarField, propSunName_);
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envCreateLat(ScalarField, propTadName_);
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envTmpLat(ScalarField, "buf");
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envTmpLat(ScalarField, "result");
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envTmpLat(ScalarField, "Amu");
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envCache(FFT, fftName_, 1, env().getGrid());
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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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makeCaches();
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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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auto &prop = envGet(ScalarField, getName());
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auto &prop0 = envGet(ScalarField, prop0Name_);
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auto &propQ = envGet(ScalarField, propQName_);
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auto &propSun = envGet(ScalarField, propSunName_);
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auto &propTad = envGet(ScalarField, propTadName_);
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auto &GFSrc = envGet(ScalarField, GFSrcName_);
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auto &G = envGet(ScalarField, freeMomPropName_);
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auto &fft = envGet(FFT, fftName_);
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double q = par().charge;
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envGetTmp(ScalarField, buf);
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// -G*momD1*G*F*Src (momD1 = F*D1*Finv)
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propQ = GFSrc;
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momD1(propQ, fft);
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propQ = -G*propQ;
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propSun = -propQ;
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fft.FFT_dim(propQ, propQ, env().getNd()-1, FFT::backward);
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// G*momD1*G*momD1*G*F*Src (here buf = G*momD1*G*F*Src)
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momD1(propSun, fft);
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propSun = G*propSun;
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fft.FFT_dim(propSun, propSun, env().getNd()-1, FFT::backward);
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// -G*momD2*G*F*Src (momD2 = F*D2*Finv)
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propTad = GFSrc;
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momD2(propTad, fft);
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propTad = -G*propTad;
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fft.FFT_dim(propTad, propTad, env().getNd()-1, FFT::backward);
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// full charged scalar propagator
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fft.FFT_dim(buf, GFSrc, env().getNd()-1, FFT::backward);
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prop = buf + q*propQ + q*q*propSun + q*q*propTad;
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// OUTPUT IF NECESSARY
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if (!par().output.empty())
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{
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Result result;
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TComplex site;
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std::vector<int> siteCoor;
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LOG(Message) << "Saving momentum-projected propagator to '"
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<< RESULT_FILE_NAME(par().output, vm().getTrajectory()) << "'..."
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<< std::endl;
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result.projection.resize(par().outputMom.size());
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result.lattice_size = env().getGrid()->_fdimensions;
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result.mass = par().mass;
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result.charge = q;
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siteCoor.resize(env().getNd());
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for (unsigned int i_p = 0; i_p < par().outputMom.size(); ++i_p)
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{
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result.projection[i_p].momentum = strToVec<int>(par().outputMom[i_p]);
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LOG(Message) << "Calculating (" << par().outputMom[i_p]
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<< ") momentum projection" << std::endl;
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result.projection[i_p].corr_0.resize(env().getGrid()->_fdimensions[env().getNd()-1]);
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result.projection[i_p].corr.resize(env().getGrid()->_fdimensions[env().getNd()-1]);
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result.projection[i_p].corr_Q.resize(env().getGrid()->_fdimensions[env().getNd()-1]);
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result.projection[i_p].corr_Sun.resize(env().getGrid()->_fdimensions[env().getNd()-1]);
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result.projection[i_p].corr_Tad.resize(env().getGrid()->_fdimensions[env().getNd()-1]);
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for (unsigned int j = 0; j < env().getNd()-1; ++j)
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{
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siteCoor[j] = result.projection[i_p].momentum[j];
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}
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for (unsigned int t = 0; t < result.projection[i_p].corr.size(); ++t)
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{
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siteCoor[env().getNd()-1] = t;
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peekSite(site, prop, siteCoor);
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result.projection[i_p].corr[t]=TensorRemove(site);
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peekSite(site, buf, siteCoor);
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result.projection[i_p].corr_0[t]=TensorRemove(site);
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peekSite(site, propQ, siteCoor);
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result.projection[i_p].corr_Q[t]=TensorRemove(site);
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peekSite(site, propSun, siteCoor);
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result.projection[i_p].corr_Sun[t]=TensorRemove(site);
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peekSite(site, propTad, siteCoor);
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result.projection[i_p].corr_Tad[t]=TensorRemove(site);
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}
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}
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saveResult(par().output, "prop", result);
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}
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std::vector<int> mask(env().getNd(),1);
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mask[env().getNd()-1] = 0;
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fft.FFT_dim_mask(prop, prop, mask, FFT::backward);
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fft.FFT_dim_mask(propQ, propQ, mask, FFT::backward);
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fft.FFT_dim_mask(propSun, propSun, mask, FFT::backward);
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fft.FFT_dim_mask(propTad, propTad, mask, FFT::backward);
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}
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void TChargedProp::makeCaches(void)
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{
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auto &freeMomProp = envGet(ScalarField, freeMomPropName_);
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auto &GFSrc = envGet(ScalarField, GFSrcName_);
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auto &prop0 = envGet(ScalarField, prop0Name_);
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auto &fft = envGet(FFT, fftName_);
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if (!freeMomPropDone_)
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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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SIMPL::MomentumSpacePropagator(freeMomProp, par().mass);
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}
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if (!GFSrcDone_)
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{
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auto &source = envGet(ScalarField, par().source);
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LOG(Message) << "Caching G*F*src..." << std::endl;
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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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if (!prop0Done_)
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{
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LOG(Message) << "Caching position-space free scalar propagator..."
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<< std::endl;
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fft.FFT_all_dim(prop0, GFSrc, FFT::backward);
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}
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if (!phasesDone_)
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{
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std::vector<int> &l = env().getGrid()->_fdimensions;
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Complex ci(0.0,1.0);
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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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auto &phmu = envGet(ScalarField, phaseName_[mu]);
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LatticeCoordinate(phmu, mu);
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phmu = exp(ci*twoPiL*phmu);
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phase_.push_back(&phmu);
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}
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}
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else
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{
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phase_.clear();
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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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}
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void TChargedProp::momD1(ScalarField &s, FFT &fft)
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{
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auto &A = envGet(EmField, par().emField);
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Complex ci(0.0,1.0);
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envGetTmp(ScalarField, buf);
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envGetTmp(ScalarField, result);
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envGetTmp(ScalarField, Amu);
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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 TChargedProp::momD2(ScalarField &s, FFT &fft)
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{
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auto &A = envGet(EmField, par().emField);
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envGetTmp(ScalarField, buf);
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envGetTmp(ScalarField, result);
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envGetTmp(ScalarField, Amu);
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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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