Grid/tests/hadrons/Test_hadrons.hpp

/*******************************************************************************
 Grid physics library, www.github.com/paboyle/Grid

 Source file: tests/hadrons/Test_hadrons.hpp

 Copyright (C) 2017

 Author: Andrew Lawson <andrew.lawson1991@gmail.com>

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along
 with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 See the full license in the file "LICENSE" in the top level distribution
 directory.
 *******************************************************************************/

#include <Grid/Hadrons/Application.hpp>

using namespace Grid;
using namespace Hadrons;

/*******************************************************************************
 * Macros to reduce code duplication.
 ******************************************************************************/
// Useful definitions
#define ZERO_MOM "0. 0. 0. 0."
#define INIT_INDEX(s, n) (std::string(s) + "_" + std::to_string(n))
#define ADD_INDEX(s, n) (s + "_" + std::to_string(n))
#define LABEL_3PT(s, t1, t2) ADD_INDEX(INIT_INDEX(s, t1), t2)
#define LABEL_4PT(s, t1, t2, t3) ADD_INDEX(ADD_INDEX(INIT_INDEX(s, t1), t2), t3)
#define LABEL_4PT_NOISE(s, t1, t2, t3, nn) ADD_INDEX(ADD_INDEX(ADD_INDEX(INIT_INDEX(s, t1), t2), t3), nn)

// Wall source/sink macros
#define NAME_3MOM_WALL_SOURCE(t, mom) ("wall_" + std::to_string(t) + "_" + mom)
#define NAME_WALL_SOURCE(t) NAME_3MOM_WALL_SOURCE(t, ZERO_MOM)
#define NAME_POINT_SOURCE(pos) ("point_" + pos)

#define MAKE_3MOM_WALL_PROP(tW, mom, propName, solver)\
{\
    std::string srcName = NAME_3MOM_WALL_SOURCE(tW, mom);\
    makeWallSource(application, srcName, tW, mom);\
    makePropagator(application, propName, srcName, solver);\
}

#define MAKE_WALL_PROP(tW, propName, solver)\
        MAKE_3MOM_WALL_PROP(tW, ZERO_MOM, propName, solver)

// Sequential source macros
#define MAKE_SEQUENTIAL_PROP(tS, qSrc, mom, propName, solver)\
{\
    std::string srcName = ADD_INDEX(qSrc + "_seq", tS);\
    makeSequentialSource(application, srcName, qSrc, tS, mom);\
    makePropagator(application, propName, srcName, solver);\
}

// Point source macros
#define MAKE_POINT_PROP(pos, propName, solver)\
{\
    std::string srcName = NAME_POINT_SOURCE(pos);\
    makePointSource(application, srcName, pos);\
    makePropagator(application, propName, srcName, solver);\
}

/*******************************************************************************
 * Functions for propagator construction.
 ******************************************************************************/
 
/*******************************************************************************
 * Name: makePointSource
 * Purpose: Construct point source and add to application module.
 * Parameters: application - main application that stores modules.
 *             srcName     - name of source module to create.
 *             pos         - Position of point source.
 * Returns: None.
 ******************************************************************************/
inline void makePointSource(Application &application, std::string srcName,
                            std::string pos)
{
    // If the source already exists, don't make the module again.
    if (!(Environment::getInstance().hasModule(srcName)))
    {
        MSource::Point::Par pointPar;
        pointPar.position = pos;
        application.createModule<MSource::Point>(srcName, pointPar);
    }
}

/*******************************************************************************
 * Name: makeSequentialSource
 * Purpose: Construct sequential source and add to application module.
 * Parameters: application - main application that stores modules.
 *             srcName     - name of source module to create.
 *             qSrc        - Input quark for sequential inversion.
 *             tS          - sequential source timeslice.
 *             mom         - momentum insertion (default is zero).
 * Returns: None.
 ******************************************************************************/
inline void makeSequentialSource(Application &application, std::string srcName,
                                 std::string qSrc, unsigned int tS,
                                 std::string mom = ZERO_MOM)
{
    // If the source already exists, don't make the module again.
    if (!(Environment::getInstance().hasModule(srcName)))
    {
        MSource::SeqGamma::Par seqPar;
        seqPar.q   = qSrc;
        seqPar.tA  = tS;
        seqPar.tB  = tS;
        seqPar.mom = mom;
        seqPar.gamma = Gamma::Algebra::GammaT;
        application.createModule<MSource::SeqGamma>(srcName, seqPar);
    }
}

/*******************************************************************************
 * Name: makeWallSource
 * Purpose: Construct wall source and add to application module.
 * Parameters: application - main application that stores modules.
 *             srcName     - name of source module to create.
 *             tW          - wall source timeslice.
 *             mom         - momentum insertion (default is zero).
 * Returns: None.
 ******************************************************************************/
inline void makeWallSource(Application &application, std::string srcName,
                           unsigned int tW, std::string mom = ZERO_MOM)
{
    // If the source already exists, don't make the module again.
    if (!(Environment::getInstance().hasModule(srcName)))
    {
        MSource::Wall::Par wallPar;
        wallPar.tW  = tW;
        wallPar.mom = mom;
        application.createModule<MSource::Wall>(srcName, wallPar);
    }
}

/*******************************************************************************
 * Name: makeWallSink
 * Purpose: Wall sink smearing of a propagator.
 * Parameters: application - main application that stores modules.
 *             propName    - name of input propagator.
 *             wallName    - name of smeared propagator.
 *             mom         - momentum insertion (default is zero).
 * Returns: None.
 ******************************************************************************/
inline void makeWallSink(Application &application, std::string propName,
                         std::string wallName, std::string mom = ZERO_MOM)
{
    // If the propagator has already been smeared, don't smear it again.
    // Temporarily removed, strategy for sink smearing likely to change.
    /*if (!(Environment::getInstance().hasModule(wallName)))
    {
        MSink::Wall::Par wallPar;
        wallPar.q   = propName;
        wallPar.mom = mom;
        application.createModule<MSink::Wall>(wallName, wallPar);
    }*/
}

/*******************************************************************************
 * Name: makePropagator
 * Purpose: Construct source and propagator then add to application module.
 * Parameters: application - main application that stores modules.
 *             propName    - name of propagator module to create.
 *             srcName     - name of source module to use.
 *             solver      - solver to use (default is CG).
 * Returns: None.
 ******************************************************************************/
inline void makePropagator(Application &application, std::string &propName,
                           std::string &srcName, std::string &solver)
{
    // If the propagator already exists, don't make the module again.
    if (!(Environment::getInstance().hasModule(propName)))
    {
        Quark::Par         quarkPar;
        quarkPar.source = srcName;
        quarkPar.solver = solver;
        application.createModule<Quark>(propName, quarkPar);
    }
}

/*******************************************************************************
 * Name: makeLoop
 * Purpose: Use noise source and inversion result to make loop propagator, then 
 *          add to application module.
 * Parameters: application - main application that stores modules.
 *             propName    - name of propagator module to create.
 *             srcName     - name of noise source module to use.
 *             resName     - name of inversion result on given noise source.
 * Returns: None.
 ******************************************************************************/
inline void makeLoop(Application &application, std::string &propName,
                     std::string &srcName, std::string &resName)
{
    // If the loop propagator already exists, don't make the module again.
    if (!(Environment::getInstance().hasModule(propName)))
    {
        MLoop::NoiseLoop::Par loopPar;
        loopPar.q   = resName;
        loopPar.eta = srcName;
        application.createModule<MLoop::NoiseLoop>(propName, loopPar);
    }
}

/*******************************************************************************
 * Contraction module creation.
 ******************************************************************************/

/*******************************************************************************
 * Name: mesonContraction
 * Purpose: Create meson contraction module and add to application module.
 * Parameters: application - main application that stores modules.
 *             npt         - specify n-point correlator (for labelling).
 *             q1          - quark propagator 1.
 *             q2          - quark propagator 2.
 *             label       - unique label to construct module name.
 *             mom         - momentum to project (default is zero)
 *             gammas      - gamma insertions at source and sink.
 * Returns: None.
 ******************************************************************************/
inline void mesonContraction(Application &application, unsigned int npt, 
                             std::string &q1, std::string &q2,
                             std::string &label, 
                             std::string mom = ZERO_MOM,
                             std::string gammas = "<Gamma5 Gamma5>")
{
    std::string modName = std::to_string(npt) + "pt_" + label;
    if (!(Environment::getInstance().hasModule(modName)))
    {
        MContraction::Meson::Par mesPar;
        mesPar.output = std::to_string(npt) + "pt/" + label;
        mesPar.q1 = q1;
        mesPar.q2 = q2;
        mesPar.mom = mom;
        mesPar.gammas = gammas;
        application.createModule<MContraction::Meson>(modName, mesPar);
    }
 }

/*******************************************************************************
 * Name: gamma3ptContraction
 * Purpose: Create gamma3pt contraction module and add to application module.
 * Parameters: application - main application that stores modules.
 *             npt         - specify n-point correlator (for labelling).
 *             q1          - quark propagator 1.
 *             q2          - quark propagator 2.
 *             q3          - quark propagator 3.
 *             label       - unique label to construct module name.
 *             gamma       - gamma insertions between q2 and q3.
 * Returns: None.
 ******************************************************************************/
inline void gamma3ptContraction(Application &application, unsigned int npt, 
                                std::string &q1, std::string &q2,
                                std::string &q3, std::string &label, 
                                Gamma::Algebra gamma = Gamma::Algebra::Identity)
{
    std::string modName = std::to_string(npt) + "pt_" + label;
    if (!(Environment::getInstance().hasModule(modName)))
    {
        MContraction::Gamma3pt::Par gamma3ptPar;
        gamma3ptPar.output = std::to_string(npt) + "pt/" + label;
        gamma3ptPar.q1 = q1;
        gamma3ptPar.q2 = q2;
        gamma3ptPar.q3 = q3;
        gamma3ptPar.gamma = gamma;
        application.createModule<MContraction::Gamma3pt>(modName, gamma3ptPar);
    }
 }

/*******************************************************************************
 * Name: weakContraction[Eye,NonEye]
 * Purpose: Create Weak Hamiltonian contraction module for Eye/NonEye topology
 *          and add to application module.
 * Parameters: application - main application that stores modules.
 *             npt         - specify n-point correlator (for labelling).
 *             q1          - quark propagator 1.
 *             q2          - quark propagator 2.
 *             q3          - quark propagator 3.
 *             q4          - quark propagator 4.
 *             label       - unique label to construct module name.
 * Returns: None.
 ******************************************************************************/
#define HW_CONTRACTION(top) \
inline void weakContraction##top(Application &application, unsigned int npt,\
                                 std::string &q1, std::string &q2, \
                                 std::string &q3, std::string &q4, \
                                 std::string &label)\
{\
    std::string modName = std::to_string(npt) + "pt_" + label;\
    if (!(Environment::getInstance().hasModule(modName)))\
    {\
        MContraction::WeakHamiltonian##top::Par weakPar;\
        weakPar.output = std::to_string(npt) + "pt/" + label;\
        weakPar.q1 = q1;\
        weakPar.q2 = q2;\
        weakPar.q3 = q3;\
        weakPar.q4 = q4;\
        application.createModule<MContraction::WeakHamiltonian##top>(modName, weakPar);\
    }\
}
HW_CONTRACTION(Eye)    // weakContractionEye
HW_CONTRACTION(NonEye) // weakContractionNonEye

/*******************************************************************************
 * Name: disc0Contraction
 * Purpose: Create contraction module for 4pt Weak Hamiltonian + current
 *          disconnected topology for neutral mesons and add to application 
 *          module.
 * Parameters: application - main application that stores modules.
 *             q1          - quark propagator 1.
 *             q2          - quark propagator 2.
 *             q3          - quark propagator 3.
 *             q4          - quark propagator 4.
 *             label       - unique label to construct module name.
 * Returns: None.
 ******************************************************************************/
inline void disc0Contraction(Application &application, 
                             std::string &q1, std::string &q2,
                             std::string &q3, std::string &q4,
                             std::string &label)
{
    std::string modName = "4pt_" + label;
    if (!(Environment::getInstance().hasModule(modName)))
    {
        MContraction::WeakNeutral4ptDisc::Par disc0Par;
        disc0Par.output = "4pt/" + label;
        disc0Par.q1 = q1;
        disc0Par.q2 = q2;
        disc0Par.q3 = q3;
        disc0Par.q4 = q4;
        application.createModule<MContraction::WeakNeutral4ptDisc>(modName, disc0Par);
    }
 }

/*******************************************************************************
 * Name: discLoopContraction
 * Purpose: Create contraction module for disconnected loop and add to
 *          application module.
 * Parameters: application - main application that stores modules.
 *             q_loop      - loop quark propagator.
 *             modName     - unique module name.
 *             gamma       - gamma matrix to use in contraction.
 * Returns: None.
 ******************************************************************************/
inline void discLoopContraction(Application &application,
                                std::string &q_loop, std::string &modName,
                                Gamma::Algebra gamma = Gamma::Algebra::Identity)
{
    if (!(Environment::getInstance().hasModule(modName)))
    {
        MContraction::DiscLoop::Par discPar;
        discPar.output = "disc/" + modName;
        discPar.q_loop = q_loop;
        discPar.gamma  = gamma;
        application.createModule<MContraction::DiscLoop>(modName, discPar);
    }
 }