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First cut (non functional NPR code) developed by Julia Kettle
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Peter Boyle
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Hadrons/Modules/MNPR/Bilinear.hpp
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224
Hadrons/Modules/MNPR/Bilinear.hpp
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/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: extras/Hadrons/Modules/MContraction/Bilinear.hpp
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Copyright (C) 2015
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Copyright (C) 2016
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Author: Julia Kettle J.R.Kettle-2@sms.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_Bilinear_hpp_
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#define Hadrons_Bilinear_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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#include <Hadrons/ModuleFactory.hpp>
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//#include <Grid/qcd/utils/PropagatorUtils.h>
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BEGIN_HADRONS_NAMESPACE
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/******************************************************************************
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* TBilinear *
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Performs bilinear contractions of the type tr[g5*adj(Sout)*g5*G*Sin]
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Suitable for non exceptional momenta in Rome-Southampton NPR
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******************************************************************************/
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BEGIN_MODULE_NAMESPACE(MNPR)
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class BilinearPar: Serializable
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{
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public:
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GRID_SERIALIZABLE_CLASS_MEMBERS(BilinearPar,
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std::string, Sin,
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std::string, Sout,
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std::string, pin,
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std::string, pout,
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std::string, output);
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};
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template <typename FImpl1, typename FImpl2>
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class TBilinear: public Module<BilinearPar>
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{
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public:
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FERM_TYPE_ALIASES(FImpl1, 1);
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FERM_TYPE_ALIASES(FImpl2, 2);
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class Result: Serializable
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{
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public:
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GRID_SERIALIZABLE_CLASS_MEMBERS(Result,
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std::vector<SpinColourMatrix>, bilinear);
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};
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public:
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// constructor
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TBilinear(const std::string name);
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// destructor
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virtual ~TBilinear(void) = default;
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// dependencies/products
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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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//LatticeSpinColourMatrix PhaseProps(LatticeSpinColourMatrix S, std::vector<Real> p);
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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(Bilinear, ARG(TBilinear<FIMPL, FIMPL>), MNPR);
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/******************************************************************************
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* TBilinear implementation *
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******************************************************************************/
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// constructor /////////////////////////////////////////////////////////////////
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template <typename FImpl1, typename FImpl2>
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TBilinear<FImpl1, FImpl2>::TBilinear(const std::string name)
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: Module<BilinearPar>(name)
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{}
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// setup ///////////////////////////////////////////////////////////////////////
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template <typename FImpl1, typename FImpl2>
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void TBilinear<FImpl1, FImpl2>::setup(void)
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{
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//env().template registerLattice<LatticeSpinColourMatrix>(getName());
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//env().template registerObject<SpinColourMatrix>(getName());
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}
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// dependencies/products ///////////////////////////////////////////////////////
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template <typename FImpl1, typename FImpl2>
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std::vector<std::string> TBilinear<FImpl1, FImpl2>::getInput(void)
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{
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std::vector<std::string> input = {par().Sin, par().Sout};
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return input;
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}
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template <typename FImpl1, typename FImpl2>
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std::vector<std::string> TBilinear<FImpl1, FImpl2>::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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/*
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/////Phase propagators//////////////////////////
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template <typename FImpl1, typename FImpl2>
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LatticeSpinColourMatrix TBilinear<FImpl1, FImpl2>::PhaseProps(LatticeSpinColourMatrix S, std::vector<Real> p)
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{
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GridBase *grid = S._grid;
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LatticeComplex pdotx(grid), coor(grid);
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std::vector<int> latt_size = grid->_fdimensions;
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Complex Ci(0.0,1.0);
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pdotx=zero;
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for (unsigned int mu = 0; mu < 4; ++mu)
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{
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Real TwoPiL = M_PI * 2.0/ latt_size[mu];
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LatticeCoordinate(coor,mu);
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pdotx = pdotx +(TwoPiL * p[mu]) * coor;
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}
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S = S*exp(-Ci*pdotx);
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return S;
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}
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*/
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// execution ///////////////////////////////////////////////////////////////////
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template <typename FImpl1, typename FImpl2>
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void TBilinear<FImpl1, FImpl2>::execute(void)
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{
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/**************************************************************************
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Compute the bilinear vertex needed for the NPR.
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V(G) = sum_x [ g5 * adj(S'(x,p2)) * g5 * G * S'(x,p1) ]_{si,sj,ci,cj}
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G is one of the 16 gamma vertices [I,gmu,g5,g5gmu,sig(mu,nu)]
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* G
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/ \
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p1/ \p2
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/ \
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/ \
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Returns a spin-colour matrix, with indices si,sj, ci,cj
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Conventions:
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p1 - incoming momenta
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p2 - outgoing momenta
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q = (p1-p2)
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**************************************************************************/
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LOG(Message) << "Computing bilinear contractions '" << getName() << "' using"
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<< " momentum '" << par().Sin << "' and '" << par().Sout << "'"
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<< std::endl;
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BinaryWriter writer(par().output);
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// Propogators
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LatticeSpinColourMatrix &Sin = *env().template getObject<LatticeSpinColourMatrix>(par().Sin);
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LatticeSpinColourMatrix &Sout = *env().template getObject<LatticeSpinColourMatrix>(par().Sout);
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LatticeComplex pdotxin(env().getGrid()), pdotxout(env().getGrid()), coor(env().getGrid());
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// momentum on legs
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std::vector<Real> pin = strToVec<Real>(par().pin), pout = strToVec<Real>(par().pout);
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std::vector<Real> latt_size(pin.begin(), pin.end());
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//bilinears
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LatticeSpinColourMatrix bilinear_x(env().getGrid());
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SpinColourMatrix bilinear;
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Gamma g5(Gamma::Algebra::Gamma5);
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Result result;
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Complex Ci(0.0,1.0);
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//
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pdotxin=zero;
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pdotxout=zero;
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for (unsigned int mu = 0; mu < 4; ++mu)
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{
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Real TwoPiL = M_PI * 2.0/ latt_size[mu];
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LatticeCoordinate(coor,mu);
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pdotxin = pdotxin +(TwoPiL * pin[mu]) * coor;
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pdotxout= pdotxout +(TwoPiL * pout[mu]) * coor;
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}
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Sin = Sin*exp(-Ci*pdotxin); //phase corrections
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Sout = Sout*exp(-Ci*pdotxout);
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////Set up gamma vector//////////////////////////
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std::vector<Gamma> gammavector;
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for( int i=0; i<Gamma::nGamma; i++){
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Gamma::Algebra gam = i;
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gammavector.push_back(Gamma(gam));
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}
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result.bilinear.resize(Gamma::nGamma);
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/////////////////////////////////////////////////
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//LatticeSpinMatrix temp = g5*Sout;
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////////Form Vertex//////////////////////////////
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for (int i=0; i < Gamma::nGamma; i++){
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bilinear_x = g5*adj(Sout)*g5*gammavector[i]*Sin;
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result.bilinear[i] = sum(bilinear_x); //sum over lattice sites
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}
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//////////////////////////////////////////////////
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write(writer, par().output, result.bilinear);
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LOG(Message) << "Complete. Writing results to " << par().output << 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_Bilinear_hpp_
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