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261 lines
9.1 KiB
C++
261 lines
9.1 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: extras/Hadrons/Modules/MScalar/VPCounterTerms.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 <Grid/Hadrons/Modules/MScalar/VPCounterTerms.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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* TVPCounterTerms implementation *
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******************************************************************************/
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// constructor /////////////////////////////////////////////////////////////////
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TVPCounterTerms::TVPCounterTerms(const std::string name)
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: Module<VPCounterTermsPar>(name)
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{}
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// dependencies/products ///////////////////////////////////////////////////////
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std::vector<std::string> TVPCounterTerms::getInput(void)
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{
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std::vector<std::string> in = {par().source};
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return in;
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}
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std::vector<std::string> TVPCounterTerms::getOutput(void)
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{
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std::vector<std::string> out;
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return out;
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}
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// setup ///////////////////////////////////////////////////////////////////////
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void TVPCounterTerms::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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phatsqName_ = getName() + "_pHatSquared";
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prop0Name_ = getName() + "_freeProp";
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twoscalarName_ = getName() + "_2scalarProp";
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psquaredName_ = getName() + "_psquaredProp";
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if (!par().output.empty())
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{
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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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momPhaseName_.push_back("_momentumphase_" + std::to_string(i_p));
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}
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}
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envCreateLat(ScalarField, freeMomPropName_);
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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envCreateLat(ScalarField, phaseName_[mu]);
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}
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envCreateLat(ScalarField, phatsqName_);
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envCreateLat(ScalarField, GFSrcName_);
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envCreateLat(ScalarField, prop0Name_);
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envCreateLat(ScalarField, twoscalarName_);
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envCreateLat(ScalarField, psquaredName_);
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if (!par().output.empty())
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{
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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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envCacheLat(ScalarField, momPhaseName_[i_p]);
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}
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}
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envTmpLat(ScalarField, "buf");
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envTmpLat(ScalarField, "tmp_vp");
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envTmpLat(ScalarField, "vpPhase");
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}
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// execution ///////////////////////////////////////////////////////////////////
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void TVPCounterTerms::execute(void)
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{
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auto &source = envGet(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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envGetTmp(ScalarField, buf);
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envGetTmp(ScalarField, tmp_vp);
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// Momentum-space free scalar propagator
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auto &G = envGet(ScalarField, freeMomPropName_);
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SIMPL::MomentumSpacePropagator(G, par().mass);
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// Phases and hat{p}^2
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auto &phatsq = envGet(ScalarField, phatsqName_);
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std::vector<int> &l = env().getGrid()->_fdimensions;
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LOG(Message) << "Calculating shift phases..." << std::endl;
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phatsq = zero;
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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(buf, mu);
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phmu = exp(ci*twoPiL*buf);
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phase_.push_back(&phmu);
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buf = 2.*sin(.5*twoPiL*buf);
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phatsq = phatsq + buf*buf;
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}
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// G*F*src
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auto &GFSrc = envGet(ScalarField, GFSrcName_);
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fft.FFT_all_dim(GFSrc, source, FFT::forward);
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GFSrc = G*GFSrc;
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// Position-space free scalar propagator
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auto &prop0 = envGet(ScalarField, prop0Name_);
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prop0 = GFSrc;
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fft.FFT_all_dim(prop0, prop0, FFT::backward);
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// Propagators for counter-terms
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auto &twoscalarProp = envGet(ScalarField, twoscalarName_);
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auto &psquaredProp = envGet(ScalarField, psquaredName_);
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twoscalarProp = G*GFSrc;
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fft.FFT_all_dim(twoscalarProp, twoscalarProp, FFT::backward);
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psquaredProp = G*phatsq*GFSrc;
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fft.FFT_all_dim(psquaredProp, psquaredProp, FFT::backward);
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// Prepare output data structure if necessary
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Result outputData;
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if (!par().output.empty())
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{
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outputData.projection.resize(par().outputMom.size());
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outputData.lattice_size = env().getGrid()->_fdimensions;
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outputData.mass = par().mass;
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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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outputData.projection[i_p].momentum = strToVec<int>(par().outputMom[i_p]);
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outputData.projection[i_p].twoScalar.resize(env().getNd());
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outputData.projection[i_p].threeScalar.resize(env().getNd());
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outputData.projection[i_p].pSquaredInsertion.resize(env().getNd());
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for (unsigned int nu = 0; nu < env().getNd(); ++nu)
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{
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outputData.projection[i_p].twoScalar[nu].resize(env().getNd());
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outputData.projection[i_p].threeScalar[nu].resize(env().getNd());
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outputData.projection[i_p].pSquaredInsertion[nu].resize(env().getNd());
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}
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// Calculate phase factors
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auto &momph_ip = envGet(ScalarField, momPhaseName_[i_p]);
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momph_ip = zero;
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for (unsigned int j = 0; j < env().getNd()-1; ++j)
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{
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Real twoPiL = M_PI*2./l[j];
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LatticeCoordinate(buf, j);
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buf = outputData.projection[i_p].momentum[j]*twoPiL*buf;
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momph_ip = momph_ip + buf;
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}
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momph_ip = exp(-ci*momph_ip);
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momPhase_.push_back(&momph_ip);
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}
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}
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// Contractions
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for (unsigned int nu = 0; nu < env().getNd(); ++nu)
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{
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buf = adj(Cshift(prop0, nu, -1));
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for (unsigned int mu = 0; mu < env().getNd(); ++mu)
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{
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// Two-scalar loop
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tmp_vp = buf * Cshift(prop0, mu, 1);
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tmp_vp -= Cshift(buf, mu, 1) * prop0;
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tmp_vp = 2.0*real(tmp_vp);
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// Output if necessary
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if (!par().output.empty())
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{
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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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project(outputData.projection[i_p].twoScalar[mu][nu],
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tmp_vp, i_p);
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}
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}
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// Three-scalar loop (no vertex)
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tmp_vp = buf * Cshift(twoscalarProp, mu, 1);
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tmp_vp -= Cshift(buf, mu, 1) * twoscalarProp;
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tmp_vp = 2.0*real(tmp_vp);
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// Output if necessary
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if (!par().output.empty())
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{
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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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project(outputData.projection[i_p].threeScalar[mu][nu],
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tmp_vp, i_p);
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}
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}
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// Three-scalar loop (hat{p}^2 insertion)
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tmp_vp = buf * Cshift(psquaredProp, mu, 1);
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tmp_vp -= Cshift(buf, mu, 1) * psquaredProp;
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tmp_vp = 2.0*real(tmp_vp);
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// Output if necessary
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if (!par().output.empty())
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{
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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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project(outputData.projection[i_p].pSquaredInsertion[mu][nu],
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tmp_vp, i_p);
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}
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}
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}
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}
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// OUTPUT IF NECESSARY
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if (!par().output.empty())
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{
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LOG(Message) << "Saving momentum-projected correlators to '"
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<< RESULT_FILE_NAME(par().output) << "'..."
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<< std::endl;
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saveResult(par().output, "scalar_loops", outputData);
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}
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}
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void TVPCounterTerms::project(std::vector<Complex> &projection, const ScalarField &vp, int i_p)
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{
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std::vector<TComplex> vecBuf;
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envGetTmp(ScalarField, vpPhase);
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vpPhase = vp*(*momPhase_[i_p]);
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sliceSum(vpPhase, vecBuf, Tp);
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projection.resize(vecBuf.size());
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for (unsigned int t = 0; t < vecBuf.size(); ++t)
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{
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projection[t] = TensorRemove(vecBuf[t]);
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}
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}
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