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z2-momentum phase module
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Felix Erben
35
Hadrons/Modules/MSource/MomentumPhase.cc
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35
Hadrons/Modules/MSource/MomentumPhase.cc
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/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: Hadrons/Modules/MSource/MomentumPhase.cc
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Copyright (C) 2015-2019
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Author: Felix Erben <ferben@ed.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/MSource/MomentumPhase.hpp>
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using namespace Grid;
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using namespace Hadrons;
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using namespace MSource;
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template class Grid::Hadrons::MSource::TMomentumPhase<FIMPL>;
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template class Grid::Hadrons::MSource::TMomentumPhase<ZFIMPL>;
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160
Hadrons/Modules/MSource/MomentumPhase.hpp
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160
Hadrons/Modules/MSource/MomentumPhase.hpp
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/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: Hadrons/Modules/MSource/MomentumPhase.hpp
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Copyright (C) 2015-2019
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Author: Felix Erben <ferben@ed.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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#ifndef Hadrons_MSource_MomentumPhase_hpp_
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#define Hadrons_MSource_MomentumPhase_hpp_
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#include <Hadrons/Global.hpp>
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#include <Hadrons/Module.hpp>
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#include <Hadrons/ModuleFactory.hpp>
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BEGIN_HADRONS_NAMESPACE
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/*
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Multiply source field by momentum phase
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-----------------------------
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* can be used to multiply a Z2-wall source by a phase e^{ipx}, which is needed for
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* 2pt-correlation functions of mesons with nonzero momenta.
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*/
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/******************************************************************************
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* MomentumPhase *
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******************************************************************************/
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BEGIN_MODULE_NAMESPACE(MSource)
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class MomentumPhasePar: Serializable
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{
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public:
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GRID_SERIALIZABLE_CLASS_MEMBERS(MomentumPhasePar,
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std::string, src,
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std::string, mom);
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};
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template <typename FImpl>
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class TMomentumPhase: public Module<MomentumPhasePar>
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{
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public:
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FERM_TYPE_ALIASES(FImpl,);
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public:
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// constructor
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TMomentumPhase(const std::string name);
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// destructor
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virtual ~TMomentumPhase(void) {};
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// dependency relation
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virtual std::vector<std::string> getInput(void);
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virtual std::vector<std::string> getOutput(void);
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protected:
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// setup
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virtual void setup(void);
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// execution
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virtual void execute(void);
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private:
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bool hasPhase_{false};
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std::string momphName_, tName_;
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};
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MODULE_REGISTER_TMP(MomentumPhase, TMomentumPhase<FIMPL>, MSource);
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MODULE_REGISTER_TMP(ZMomentumPhase, TMomentumPhase<ZFIMPL>, MSource);
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/******************************************************************************
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* TMomentumPhase implementation *
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******************************************************************************/
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// constructor /////////////////////////////////////////////////////////////////
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template <typename FImpl>
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TMomentumPhase<FImpl>::TMomentumPhase(const std::string name)
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: Module<MomentumPhasePar>(name)
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, momphName_ (name + "_momph")
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, tName_ (name + "_t")
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{}
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// dependencies/products ///////////////////////////////////////////////////////
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template <typename FImpl>
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std::vector<std::string> TMomentumPhase<FImpl>::getInput(void)
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{
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std::vector<std::string> in = {par().src};
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return in;
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}
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template <typename FImpl>
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std::vector<std::string> TMomentumPhase<FImpl>::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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template <typename FImpl>
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void TMomentumPhase<FImpl>::setup(void)
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{
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envCreateLat(PropagatorField, getName());
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envCache(Lattice<iScalar<vInteger>>, tName_, 1, envGetGrid(LatticeComplex));
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envCacheLat(LatticeComplex, momphName_);
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envTmpLat(LatticeComplex, "coor");
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}
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// execution ///////////////////////////////////////////////////////////////////
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template <typename FImpl>
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void TMomentumPhase<FImpl>::execute(void)
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{
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LOG(Message) << "Multiplying source field " << par().src
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<< " by momentum phase "
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<< par().mom << std::endl;
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auto &out = envGet(PropagatorField, getName());
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auto &src = envGet(PropagatorField, par().src);
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auto &ph = envGet(LatticeComplex, momphName_);
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auto &t = envGet(Lattice<iScalar<vInteger>>, tName_);
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if (!hasPhase_)
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{
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Complex i(0.0,1.0);
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std::vector<Real> p;
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envGetTmp(LatticeComplex, coor);
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p = strToVec<Real>(par().mom);
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ph = zero;
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for(unsigned int mu = 0; mu < env().getNd(); mu++)
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{
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LatticeCoordinate(coor, mu);
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ph = ph + (p[mu]/env().getDim(mu))*coor;
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}
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ph = exp((Real)(2*M_PI)*i*ph);
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LatticeCoordinate(t, Tp);
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hasPhase_ = true;
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}
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out = ph*src;
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}
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END_MODULE_NAMESPACE
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END_HADRONS_NAMESPACE
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#endif // Hadrons_MSource_MomentumPhase_hpp_
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