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BaryonUtils.h is now part of Baryons

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Michael Marshall
2019-09-17 13:19:20 +01:00
parent ce965ee6bb
commit 3137628222
1 changed files with 0 additions and 176 deletions
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Grid/qcd/utils/BaryonUtils.h
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@@ -1,176 +0,0 @@
/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./lib/qcd/utils/BaryonUtils.h
Copyright (C) 2019
Author: Felix Erben <felix.erben@ed.ac.uk>
Author: Michael Marshall <Michael.Marshall@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 */
#pragma once
//#include <Grid/Hadrons/Global.hpp>
#include <Grid/Eigen/unsupported/CXX11/Tensor>
NAMESPACE_BEGIN(Grid);
#undef DELTA_F_EQ_2
template <typename FImpl>
class BaryonUtils
{
public:
typedef typename FImpl::ComplexField ComplexField;
typedef typename FImpl::FermionField FermionField;
typedef typename FImpl::PropagatorField PropagatorField;
typedef typename FImpl::SitePropagator pobj;
typedef typename FImpl::SiteSpinor vobj;
typedef typename vobj::scalar_object sobj;
typedef typename vobj::scalar_type scalar_type;
typedef typename vobj::vector_type vector_type;
static void ContractBaryons(const PropagatorField &q1_src,
const PropagatorField &q2_src,
const PropagatorField &q3_src,
const Gamma GammaA,
const Gamma GammaB,
const char quarks_snk[],
const char quarks_src[],
const int parity,
ComplexField &baryon_corr);
};
template<class FImpl>
void BaryonUtils<FImpl>::ContractBaryons(const PropagatorField &q1_src,
const PropagatorField &q2_src,
const PropagatorField &q3_src,
const Gamma GammaA,
const Gamma GammaB,
const char quarks_snk[],
const char quarks_src[],
const int parity,
ComplexField &baryon_corr)
{
assert(parity==1 || parity == -1 && "Parity must be +1 or -1");
GridBase *grid = q1_src.Grid();
Gamma g4(Gamma::Algebra::GammaT); //needed for parity P_\pm = 0.5*(1 \pm \gamma_4)
std::vector<std::vector<int>> epsilon = {{0,1,2},{1,2,0},{2,0,1},{0,2,1},{2,1,0},{1,0,2}};
std::vector<int> epsilon_sgn = {1,1,1,-1,-1,-1};
std::vector<int> wick_contraction = {0,0,0,0,0,0};
for (int ie=0; ie < 6 ; ie++)
if (quarks_src[0] == quarks_snk[epsilon[ie][0]] && quarks_src[1] == quarks_snk[epsilon[ie][1]] && quarks_src[2] == quarks_snk[epsilon[ie][2]])
wick_contraction[ie]=1;
typedef typename ComplexField::vector_object vobj;
LatticeView<vobj> vbaryon_corr{ baryon_corr };
accelerator_for(ss, grid->oSites(), grid->Nsimd(), {
LatticeView<pobj> v1(q1_src);
LatticeView<pobj> v2(q2_src);
LatticeView<pobj> v3(q3_src);
auto D1 = v1[ss];
auto D2 = v2[ss];
auto D3 = v3[ss];
auto gD1a = GammaA * GammaA * D1;
auto gD1b = GammaA * g4 * GammaA * D1;
auto pD1 = 0.5* (gD1a + (double)parity * gD1b);
auto gD3 = GammaB * D3;
vobj result{ 0 };
for (int ie_src=0; ie_src < 6 ; ie_src++){
int a_src = epsilon[ie_src][0]; //a
int b_src = epsilon[ie_src][1]; //b
int c_src = epsilon[ie_src][2]; //c
for (int ie_snk=0; ie_snk < 6 ; ie_snk++){
int a_snk = epsilon[ie_snk][0]; //a'
int b_snk = epsilon[ie_snk][1]; //b'
int c_snk = epsilon[ie_snk][2]; //c'
//This is the \delta_{456}^{123} part
if (wick_contraction[0]){
auto D2g = D2 * GammaB;
for (int alpha_snk=0; alpha_snk<Ns; alpha_snk++){
for (int beta_src=0; beta_src<Ns; beta_src++){
for (int gamma_src=0; gamma_src<Ns; gamma_src++){
result()()() += epsilon_sgn[ie_src] * epsilon_sgn[ie_snk] * pD1()(gamma_src,gamma_src)(c_snk,c_src)*D2g()(alpha_snk,beta_src)(a_snk,a_src)*gD3()(alpha_snk,beta_src)(b_snk,b_src);
}}}
}
//This is the \delta_{456}^{231} part
if (wick_contraction[1]){
auto pD1g = pD1 * GammaB;
for (int alpha_snk=0; alpha_snk<Ns; alpha_snk++){
for (int beta_src=0; beta_src<Ns; beta_src++){
for (int gamma_src=0; gamma_src<Ns; gamma_src++){
result()()() += epsilon_sgn[ie_src] * epsilon_sgn[ie_snk] * pD1g()(gamma_src,beta_src)(c_snk,a_src)*D2()(alpha_snk,beta_src)(a_snk,b_src)*gD3()(alpha_snk,gamma_src)(b_snk,c_src);
}}}
}
//This is the \delta_{456}^{312} part
if (wick_contraction[2]){
auto gD3g = gD3 * GammaB;
for (int alpha_snk=0; alpha_snk<Ns; alpha_snk++){
for (int beta_src=0; beta_src<Ns; beta_src++){
for (int gamma_src=0; gamma_src<Ns; gamma_src++){
result()()() += epsilon_sgn[ie_src] * epsilon_sgn[ie_snk] * pD1()(gamma_src,beta_src)(c_snk,b_src)*D2()(alpha_snk,gamma_src)(a_snk,c_src)*gD3g()(alpha_snk,beta_src)(b_snk,a_src);
}}}
}
//This is the \delta_{456}^{132} part
if (wick_contraction[3]){
auto gD3g = gD3 * GammaB;
for (int alpha_snk=0; alpha_snk<Ns; alpha_snk++){
for (int beta_src=0; beta_src<Ns; beta_src++){
for (int gamma_src=0; gamma_src<Ns; gamma_src++){
result()()() -= epsilon_sgn[ie_src] * epsilon_sgn[ie_snk] * pD1()(gamma_src,gamma_src)(c_snk,c_src)*D2()(alpha_snk,beta_src)(a_snk,b_src)*gD3g()(alpha_snk,beta_src)(b_snk,a_src);
}}}
}
//This is the \delta_{456}^{321} part
if (wick_contraction[4]){
auto D2g = D2 * GammaB;
for (int alpha_snk=0; alpha_snk<Ns; alpha_snk++){
for (int beta_src=0; beta_src<Ns; beta_src++){
for (int gamma_src=0; gamma_src<Ns; gamma_src++){
result()()() -= epsilon_sgn[ie_src] * epsilon_sgn[ie_snk] * pD1()(gamma_src,beta_src)(c_snk,b_src)*D2g()(alpha_snk,beta_src)(a_snk,a_src)*gD3()(alpha_snk,gamma_src)(b_snk,c_src);
}}}
}
//This is the \delta_{456}^{213} part
if (wick_contraction[5]){
auto pD1g = pD1 * GammaB;
for (int alpha_snk=0; alpha_snk<Ns; alpha_snk++){
for (int beta_src=0; beta_src<Ns; beta_src++){
for (int gamma_src=0; gamma_src<Ns; gamma_src++){
result()()() -= epsilon_sgn[ie_src] * epsilon_sgn[ie_snk] * pD1g()(gamma_src,beta_src)(c_snk,a_src)*D2()(alpha_snk,gamma_src)(a_snk,c_src)*gD3()(alpha_snk,beta_src)(b_snk,b_src);
}}}
}
}
}
vbaryon_corr[ss] = result;
} );//end loop over lattice sites
}
NAMESPACE_END(Grid);