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function to generate Chroma-style gamma matrix products

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This commit is contained in:
Antonin Portelli 2016-05-01 18:30:35 -07:00
parent c4c89336fe
commit c698b16d75
2 changed files with 29 additions and 1 deletions
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25
lib/qcd/spin/Dirac.cc
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@ -61,6 +61,31 @@ namespace Grid {
" "
};
SpinMatrix makeGammaProd(const unsigned int i)
{
SpinMatrix g;
g = 1.;
if (i & 0x1)
{
g = g*Gamma(Gamma::GammaMatrix::GammaX);
}
if (i & 0x2)
{
g = g*Gamma(Gamma::GammaMatrix::GammaY);
}
if (i & 0x4)
{
g = g*Gamma(Gamma::GammaMatrix::GammaZ);
}
if (i & 0x8)
{
g = g*Gamma(Gamma::GammaMatrix::GammaT);
}
return g;
}
// void sprojMul( vHalfSpinColourVector &out,vColourMatrix &u, vSpinColourVector &in){
// vHalfSpinColourVector hspin;
// spProjXp(hspin,in);

3
lib/qcd/spin/Dirac.h
View File

@ -83,6 +83,9 @@ namespace QCD {
};
// Make gamma products (Chroma convention)
SpinMatrix makeGammaProd(const unsigned int i);
/* Gx
* 0 0 0 i
* 0 0 i 0