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Grid/Hadrons/Modules/MNPR/FourQuark.hpp

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/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: Hadrons/Modules/MNPR/FourQuark.hpp
Copyright (C) 2015-2019
Author: Antonin Portelli <antonin.portelli@me.com>
Author: Julia Kettle J.R.Kettle-2@sms.ed.ac.uk
Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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
*************************************************************************************/
/* END LEGAL */
#ifndef Hadrons_FourQuark_hpp_
#define Hadrons_FourQuark_hpp_
#include <typeinfo>
#include <Hadrons/Global.hpp>
#include <Hadrons/Module.hpp>
#include <Hadrons/ModuleFactory.hpp>
#include <Grid/serialisation/Serialisation.h>
BEGIN_HADRONS_NAMESPACE
/******************************************************************************
* TFourQuark *
Performs fourquark contractions of the type tr[g5*adj(Sout)*g5*G*Sin]
Suitable for non exceptional momenta
******************************************************************************/
BEGIN_MODULE_NAMESPACE(MNPR)
class FourQuarkPar: Serializable
{
public:
GRID_SERIALIZABLE_CLASS_MEMBERS(FourQuarkPar,
std::string, Sin, //need to make this a propogator type?
std::string, Sout, //same
std::string, pin,
std::string, pout,
bool, fullbasis,
std::string, output);
};
template <typename FImpl1, typename FImpl2>
class TFourQuark: public Module<FourQuarkPar>
{
public:
FERM_TYPE_ALIASES(FImpl1, 1);
FERM_TYPE_ALIASES(FImpl2, 2);
class Result: Serializable
{
public:
GRID_SERIALIZABLE_CLASS_MEMBERS(Result,
std::vector<SpinColourSpinColourMatrix>, fourquark);
};
public:
// constructor
TFourQuark(const std::string name);
// destructor
virtual ~TFourQuark(void) {};
// dependencies/products
virtual std::vector<std::string> getInput(void);
virtual std::vector<std::string> getOutput(void);
// setup
virtual void tensorprod(LatticeSpinColourSpinColourMatrix &lret, LatticeSpinColourMatrix a, LatticeSpinColourMatrix b);
virtual void setup(void);
// execution
virtual void execute(void);
};
MODULE_REGISTER_TMP(FourQuark, ARG(TFourQuark<FIMPL, FIMPL>), MNPR);
/******************************************************************************
* TFourQuark implementation *
******************************************************************************/
// constructor /////////////////////////////////////////////////////////////////
template <typename FImpl1, typename FImpl2>
TFourQuark<FImpl1, FImpl2>::TFourQuark(const std::string name)
: Module<FourQuarkPar>(name)
{}
// dependencies/products ///////////////////////////////////////////////////////
template <typename FImpl1, typename FImpl2>
std::vector<std::string> TFourQuark<FImpl1, FImpl2>::getInput(void)
{
std::vector<std::string> input = {par().Sin, par().Sout};
return input;
}
template <typename FImpl1, typename FImpl2>
std::vector<std::string> TFourQuark<FImpl1, FImpl2>::getOutput(void)
{
std::vector<std::string> output = {getName()};
return output;
}
template <typename FImpl1, typename FImpl2>
void TFourQuark<FImpl1, FImpl2>::tensorprod(LatticeSpinColourSpinColourMatrix &lret, LatticeSpinColourMatrix a, LatticeSpinColourMatrix b)
{
#if 0
parallel_for(auto site=lret.begin();site<lret.end();site++) {
for (int si; si < 4; ++si){
for(int sj; sj <4; ++sj){
for (int ci; ci < 3; ++ci){
for (int cj; cj < 3; ++cj){
for (int sk; sk < 4; ++sk){
for(int sl; sl <4; ++sl){
for (int ck; ck < 3; ++ck){
for (int cl; cl < 3; ++cl){
lret[site]()(si,sj)(ci,cj)(sk,sl)(ck,cl)=a[site]()(si,sj)(ci,cj)*b[site]()(sk,sl)(ck,cl);
}}
}}
}}
}}
}
#else
// FIXME ; is there a general need for this construct ? In which case we should encapsulate the
// below loops in a helper function.
//LOG(Message) << "sp co mat a is - " << a << std::endl;
//LOG(Message) << "sp co mat b is - " << b << std::endl;
parallel_for(auto site=lret.begin();site<lret.end();site++) {
vTComplex left;
for(int si=0; si < Ns; ++si){
for(int sj=0; sj < Ns; ++sj){
for (int ci=0; ci < Nc; ++ci){
for (int cj=0; cj < Nc; ++cj){
//LOG(Message) << "si, sj, ci, cj - " << si << ", " << sj << ", "<< ci << ", "<< cj << std::endl;
left()()() = a[site]()(si,sj)(ci,cj);
//LOG(Message) << left << std::endl;
lret[site]()(si,sj)(ci,cj)=left()*b[site]();
}}
}}
}
#endif
}
// setup ///////////////////////////////////////////////////////////////////////
template <typename FImpl1, typename FImpl2>
void TFourQuark<FImpl1, FImpl2>::setup(void)
{
envCreateLat(LatticeSpinColourMatrix, getName());
}
// execution ///////////////////////////////////////////////////////////////////
template <typename FImpl1, typename FImpl2>
void TFourQuark<FImpl1, FImpl2>::execute(void)
{
/*********************************************************************************
TFourQuark : Creates the four quark vertex required for the NPR of four-quark ops
V_{Gamma_1,Gamma_2} = sum_x [ ( g5 * adj(S'(x,p2)) * g5 * G1 * S'(x,p1) )_ci,cj;si,sj x ( g5 * adj(S'(x,p2)) * g5 * G2 S'(x,p1) )_ck,cl;sk,cl ]
Create a bilinear vertex for G1 and G2 the spin and colour indices are kept free. Where there are 16 potential Gs.
We then find the outer product of V1 and V2, keeping the spin and colour indices uncontracted
Then this is summed over the lattice coordinate
Result is a SpinColourSpinColourMatrix - with 4 colour and 4 spin indices.
We have up to 256 of these including the offdiag (G1 != G2).
\ /
\p1 p1/
\ /
\ /
G1 * * G2
/ \
/ \
/p2 p2\
/ \
*********************************************************************************/
LOG(Message) << "Computing fourquark contractions '" << getName() << "' using"
<< " momentum '" << par().Sin << "' and '" << par().Sout << "'"
<< std::endl;
BinaryWriter writer(par().output);
PropagatorField1 &Sin = *env().template getObject<PropagatorField1>(par().Sin);
PropagatorField2 &Sout = *env().template getObject<PropagatorField2>(par().Sout);
std::vector<Real> pin = strToVec<Real>(par().pin), pout = strToVec<Real>(par().pout);
bool fullbasis = par().fullbasis;
Gamma g5(Gamma::Algebra::Gamma5);
Result result;
std::vector<Real> latt_size(pin.begin(), pin.end());
LatticeComplex pdotxin(env().getGrid()), pdotxout(env().getGrid()), coor(env().getGrid());
LatticeSpinColourMatrix bilinear_mu(env().getGrid()), bilinear_nu(env().getGrid());
LatticeSpinColourSpinColourMatrix lret(env().getGrid());
Complex Ci(0.0,1.0);
//Phase propagators
//Sin = Grid::QCD::PropUtils::PhaseProps(Sin,pin);
//Sout = Grid::QCD::PropUtils::PhaseProps(Sout,pout);
//find p.x for in and out so phase can be accounted for in propagators
pdotxin=zero;
pdotxout=zero;
for (unsigned int mu = 0; mu < 4; ++mu)
{
Real TwoPiL = M_PI * 2.0/ latt_size[mu];
LatticeCoordinate(coor,mu);
pdotxin = pdotxin +(TwoPiL * pin[mu]) * coor;
pdotxout= pdotxout +(TwoPiL * pout[mu]) * coor;
}
Sin = Sin*exp(-Ci*pdotxin); //phase corrections
Sout = Sout*exp(-Ci*pdotxout);
//Set up Gammas
std::vector<Gamma> gammavector;
for( int i=1; i<Gamma::nGamma; i+=2){
Gamma::Algebra gam = i;
gammavector.push_back(Gamma(gam));
}
lret = zero;
if (fullbasis == true){ // all combinations of mu and nu
result.fourquark.resize(Gamma::nGamma/2*Gamma::nGamma/2);
for( int mu=0; mu<Gamma::nGamma/2; mu++){
bilinear_mu = g5*adj(Sout)*g5*gammavector[mu]*Sin;
for ( int nu=0; nu<Gamma::nGamma; nu++){
LatticeSpinColourMatrix bilinear_nu(env().getGrid());
bilinear_nu = g5*adj(Sout)*g5*gammavector[nu]*Sin;
LOG(Message) << "bilinear_nu for nu = " << nu << " is - " << bilinear_mu << std::endl;
result.fourquark[mu*Gamma::nGamma/2 + nu] = zero;
tensorprod(lret,bilinear_mu,bilinear_nu);
result.fourquark[mu*Gamma::nGamma/2 + nu] = sum(lret);
}
}
} else {
result.fourquark.resize(Gamma::nGamma/2);
for ( int mu=0; mu<1; mu++){
//for( int mu=0; mu<Gamma::nGamma/2; mu++ ){
bilinear_mu = g5*adj(Sout)*g5*gammavector[mu]*Sin;
//LOG(Message) << "bilinear_mu for mu = " << mu << " is - " << bilinear_mu << std::endl;
result.fourquark[mu] = zero;
tensorprod(lret,bilinear_mu,bilinear_mu); //tensor outer product
result.fourquark[mu] = sum(lret);
}
}
write(writer, "fourquark", result.fourquark);
}
END_MODULE_NAMESPACE
END_HADRONS_NAMESPACE
#endif // Hadrons_FourQuark_hpp_
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