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150 lines
4.6 KiB
C++
150 lines
4.6 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: Hadrons/Modules/MSource/Momentum.hpp
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Copyright (C) 2015-2018
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Author: Antonin Portelli <antonin.portelli@me.com>
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Author: Peter Boyle <paboyle@ph.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_Momentum_hpp_
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#define Hadrons_Momentum_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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Plane Wave source
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-----------------
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src_x = e^i2pi/L * p *position
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*/
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/******************************************************************************
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* Plane Wave source *
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******************************************************************************/
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BEGIN_MODULE_NAMESPACE(MSource)
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class MomentumPar: Serializable
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{
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public:
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//What is meant by serializable in this context
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GRID_SERIALIZABLE_CLASS_MEMBERS(MomentumPar,
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std::string, mom);
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};
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template <typename FImpl>
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class TMomentum: public Module<MomentumPar>
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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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TMomentum(const std::string name);
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// destructor
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virtual ~TMomentum(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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// 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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};
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MODULE_REGISTER_TMP(Momentum, TMomentum<FIMPL>, MSource);
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//MODULE_REGISTER_NS(Momentum, TMomentum, MSource);
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/******************************************************************************
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* TMomentum template implementation *
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******************************************************************************/
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// constructor /////////////////////////////////////////////////////////////////
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template <typename FImpl>
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TMomentum<FImpl>::TMomentum(const std::string name)
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: Module<MomentumPar>(name)
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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> TMomentum<FImpl>::getInput(void)
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{
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std::vector<std::string> in;
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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> TMomentum<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 TMomentum<FImpl>::setup(void)
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{
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envCreateLat(PropagatorField, getName());
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}
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//execution//////////////////////////////////////////////////////////////////
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template <typename FImpl>
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void TMomentum<FImpl>::execute(void)
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{
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LOG(Message) << "Generating planewave momentum source with momentum " << par().mom << std::endl;
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//what does this env do?
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PropagatorField &src = envGet(PropagatorField, getName());
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Lattice<iScalar<vInteger>> t(env().getGrid());
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LatticeComplex C(env().getGrid()), coor(env().getGrid());
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std::vector<Real> p;
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std::vector<Real> latt_size(GridDefaultLatt().begin(), GridDefaultLatt().end());
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Complex i(0.0,1.0);
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LOG(Message) << " " << std::endl;
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//get the momentum from parameters
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p = strToVec<Real>(par().mom);
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C = Zero();
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LOG(Message) << "momentum converted from string - " << std::to_string(p[0]) <<std::to_string(p[1]) <<std::to_string(p[2]) << std::to_string(p[3]) << std::endl;
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for(int mu=0;mu<4;mu++){
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Real TwoPiL = M_PI * 2.0/ latt_size[mu];
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LatticeCoordinate(coor,mu);
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C = C +(TwoPiL * p[mu]) * coor;
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}
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C = exp(C*i);
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LOG(Message) << "exponential of pdotx taken " << std::endl;
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src = src + C;
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LOG(Message) << "source created" << std::endl;
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}
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END_MODULE_NAMESPACE
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END_HADRONS_NAMESPACE
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#endif // Hadrons_Momentum_hpp_
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