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second way to compute baryons - qdp style

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This commit is contained in:
Felix Erben
2019-07-30 13:46:59 +01:00
parent e7050a7aed
commit e66d48c142
6 changed files with 306 additions and 85 deletions
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58
Grid/qcd/utils/BaryonUtils.h
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@ -27,6 +27,9 @@ public:
const Gamma GammaA,
const Gamma GammaB,
ComplexField &baryon_corr);
static LatticeSpinColourMatrix quarkContract13(const PropagatorField &q1,
const PropagatorField &q2);
};
@ -139,19 +142,70 @@ void BaryonUtils<FImpl>::ContractBaryons(const PropagatorField &q1,
}}}
}
if (ie_src==0 && ie_snk==0){
/*if (ie_src==0 && ie_snk==0){
baryon_corr._odata[ss] = result;
} else {
baryon_corr._odata[ss] += result;
}
}*/
}
}
baryon_corr._odata[ss] = result;
} //end loop over lattice sites
}
//QDP / CHROMA - style diquark construction
// (q_out)^{c'c}_{alpha,beta} = epsilon^{abc} epsilon^{a'b'c'} (q1)^{aa'}_{rho alpha}^* (q2)^{bb'}_{rho beta}
template<class FImpl>
LatticeSpinColourMatrix BaryonUtils<FImpl>::quarkContract13(const PropagatorField &q1,
const PropagatorField &q2)
{
GridBase *grid = q1._grid;
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};
LatticeSpinColourMatrix q_out=zero;
parallel_for(int ss=0;ss<grid->oSites();ss++){
typedef typename ComplexField::vector_object vobj;
auto D1 = q1._odata[ss];
auto D2 = q2._odata[ss];
//auto D_out = q_out._odata[ss];
//D_out=zero;
SpinColourMatrix D_out=zero;
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'
for (int alpha=0; alpha<Ns; alpha++){
for (int beta=0; beta<Ns; beta++){
for (int rho=0; rho<Ns; rho++){
D_out()(alpha,beta)(c_snk,c_src) += epsilon_sgn[ie_src] * epsilon_sgn[ie_snk] * D1()(rho,alpha)(a_src,a_snk)*D2()(rho,beta)(b_src,b_snk);
}}}
}
}
q_out._odata[ss]=D_out;
} //end loop over lattice sites
return q_out;
}
}}