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https://github.com/paboyle/Grid.git
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First implementation of Dirac matrices as a Gamma class.
This commit is contained in:
Peter Boyle
@ -143,4 +143,7 @@ namespace QCD {
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} //namespace QCD
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} // Grid
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#include <qcd/Grid_qcd_dirac.h>
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#endif
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393
lib/qcd/Grid_qcd_dirac.h
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393
lib/qcd/Grid_qcd_dirac.h
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@ -0,0 +1,393 @@
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#ifndef GRID_QCD_DIRAC_H
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#define GRID_QCD_DIRAC_H
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namespace Grid{
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namespace QCD {
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class Gamma {
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public:
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const int Ns=4;
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enum GammaMatrix {
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Identity,
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GammaX,
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GammaY,
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GammaZ,
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GammaT,
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Gamma5,
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// GammaXGamma5,
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// GammaYGamma5,
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// GammaZGamma5,
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// GammaTGamma5,
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// SigmaXY,
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// SigmaXZ,
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// SigmaYZ,
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// SigmaXT,
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// SigmaYT,
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// SigmaZT,
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MinusIdentity,
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MinusGammaX,
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MinusGammaY,
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MinusGammaZ,
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MinusGammaT,
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MinusGamma5
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// MinusGammaXGamma5, easiest to form by composition
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// MinusGammaYGamma5, as performance is not critical for these
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// MinusGammaZGamma5,
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// MinusGammaTGamma5,
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// MinusSigmaXY,
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// MinusSigmaXZ,
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// MinusSigmaYZ,
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// MinusSigmaXT,
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// MinusSigmaYT,
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// MinusSigmaZT
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};
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Gamma (GammaMatrix g) { _g=g; }
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GammaMatrix _g;
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};
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/* Gx
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* 0 0 0 i
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* 0 0 i 0
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* 0 -i 0 0
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* -i 0 0 0
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*/
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template<class vtype> inline void rmultMinusGammaX(iMatrix<vtype,Ns> &ret,const iMatrix<vtype,Ns> &rhs){
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for(int i=0;i<Ns;i++){
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ret(i,0) = timesI(rhs(i,3));
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ret(i,1) = timesI(rhs(i,2));
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ret(i,2) = timesMinusI(rhs(i,1));
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ret(i,3) = timesMinusI(rhs(i,0));
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}
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};
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template<class vtype> inline void rmultGammaX(iMatrix<vtype,Ns> &ret, const iMatrix<vtype,Ns> &rhs){
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for(int i=0;i<Ns;i++){
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ret(i,0) = timesMinusI(rhs(i,3));
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ret(i,1) = timesMinusI(rhs(i,2));
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ret(i,2) = timesI(rhs(i,1));
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ret(i,3) = timesI(rhs(i,1));
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}
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};
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template<class vtype> inline void multGammaX(iVector<vtype,Ns> &ret, iVector<vtype,Ns> &rhs){
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ret._internal[0] = timesI(rhs._internal[3]);
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ret._internal[1] = timesI(rhs._internal[2]);
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ret._internal[2] = timesMinusI(rhs._internal[1]);
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ret._internal[3] = timesMinusI(rhs._internal[0]);
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};
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template<class vtype> inline void multMinusGammaX(iVector<vtype,Ns> &ret, iVector<vtype,Ns> &rhs){
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ret(0) = timesMinusI(rhs(3));
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ret(1) = timesMinusI(rhs(2));
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ret(2) = timesI(rhs(1));
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ret(3) = timesI(rhs(0));
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};
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template<class vtype> inline void multGammaX(iMatrix<vtype,Ns> &ret, const iMatrix<vtype,Ns> &rhs){
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for(int i=0;i<Ns;i++){
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ret(0,i) = timesI(rhs(3,i));
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ret(1,i) = timesI(rhs._internal[2][i]);
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ret(2,i) = timesMinusI(rhs._internal[1][i]);
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ret(3,i) = timesMinusI(rhs._internal[0][i]);
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}
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};
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template<class vtype> inline void multMinusGammaX(iMatrix<vtype,Ns> &ret, const iMatrix<vtype,Ns> &rhs){
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for(int i=0;i<Ns;i++){
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ret(0,i) = timesMinusI(rhs(3,i));
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ret(1,i) = timesMinusI(rhs(2,i));
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ret(2,i) = timesI(rhs(1,i));
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ret(3,i) = timesI(rhs(0,i));
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}
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};
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/*Gy
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* 0 0 0 -1 [0] -+ [3]
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* 0 0 1 0 [1] +- [2]
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* 0 1 0 0
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* -1 0 0 0
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*/
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template<class vtype> inline void multGammaY(iVector<vtype,Ns> &ret, iVector<vtype,Ns> &rhs){
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ret(0) = -rhs(3);
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ret(1) = rhs(2);
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ret(2) = rhs(1);
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ret(3) = -rhs(0);
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};
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template<class vtype> inline void multMinusGammaY(iVector<vtype,Ns> &ret, iVector<vtype,Ns> &rhs){
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ret(0) = rhs(3);
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ret(1) = -rhs(2);
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ret(2) = -rhs(1);
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ret(3) = rhs(0);
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};
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template<class vtype> inline void multGammaY(iMatrix<vtype,Ns> &ret, const iMatrix<vtype,Ns> &rhs){
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for(int i=0;i<Ns;i++){
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ret(0,i) = -rhs(3,i);
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ret(1,i) = rhs(2,i);
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ret(2,i) = rhs(1,i);
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ret(3,i) = -rhs(0,i);
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}
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};
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template<class vtype> inline void multMinusGammaY(iMatrix<vtype,Ns> &ret, const iMatrix<vtype,Ns> &rhs){
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for(int i=0;i<Ns;i++){
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ret(0,i) = rhs(3,i);
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ret(1,i) = -rhs(2,i);
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ret(2,i) = -rhs(1,i);
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ret(3,i) = rhs(0,i);
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}
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};
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/*Gz
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* 0 0 i 0 [0]+-i[2]
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* 0 0 0 -i [1]-+i[3]
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* -i 0 0 0
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* 0 i 0 0
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*/
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template<class vtype> inline void multGammaZ(iVector<vtype,Ns> &ret, iVector<vtype,Ns> &rhs){
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ret(0) = timesI(rhs(2));
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ret(1) =timesMinusI(rhs(3));
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ret(2) =timesMinusI(rhs(0));
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ret(3) = timesI(rhs(1));
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};
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template<class vtype> inline void multMinusGammaZ(iVector<vtype,Ns> &ret, iVector<vtype,Ns> &rhs){
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ret(0) = timesMinusI(rhs(2));
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ret(1) = timesI(rhs(3));
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ret(2) = timesI(rhs(0));
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ret(3) = timesMinusI(rhs(1));
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};
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template<class vtype> inline void multGammaZ(iMatrix<vtype,Ns> &ret, const iMatrix<vtype,Ns> &rhs){
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for(int i=0;i<Ns;i++){
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ret(0,i) = timesI(rhs(2,i));
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ret(1,i) =timesMinusI(rhs(3,i));
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ret(2,i) =timesMinusI(rhs(0,i));
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ret(3,i) = timesI(rhs(1,i));
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}
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};
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template<class vtype> inline void multMinusGammaZ(iMatrix<vtype,Ns> &ret, const iMatrix<vtype,Ns> &rhs){
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for(int i=0;i<Ns;i++){
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ret(0,i) = timesMinusI(rhs(2,i));
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ret(1,i) = timesI(rhs(3,i));
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ret(2,i) = timesI(rhs(0,i));
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ret(3,i) = timesMinusI(rhs(1,i));
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}
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};
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/*Gt
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* 0 0 1 0 [0]+-[2]
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* 0 0 0 1 [1]+-[3]
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* 1 0 0 0
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* 0 1 0 0
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*/
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template<class vtype> inline void multGammaT(iVector<vtype,Ns> &ret, iVector<vtype,Ns> &rhs){
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ret(0) = rhs(2);
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ret(1) = rhs(3);
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ret(2) = rhs(0);
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ret(3) = rhs(1);
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};
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template<class vtype> inline void multMinusGammaT(iVector<vtype,Ns> &ret, iVector<vtype,Ns> &rhs){
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ret(0) =-rhs(2);
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ret(1) =-rhs(3);
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ret(2) =-rhs(0);
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ret(3) =-rhs(1);
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};
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template<class vtype> inline void multGammaT(iMatrix<vtype,Ns> &ret, const iMatrix<vtype,Ns> &rhs){
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for(int i=0;i<Ns;i++){
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ret(0,i) = rhs(2,i);
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ret(1,i) = rhs(3,i);
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ret(2,i) = rhs(0,i);
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ret(3,i) = rhs(1,i);
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}
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};
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template<class vtype> inline void multMinusGammaT(iMatrix<vtype,Ns> &ret, const iMatrix<vtype,Ns> &rhs){
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for(int i=0;i<Ns;i++){
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ret(0,i) =-rhs(2,i);
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ret(1,i) =-rhs(3,i);
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ret(2,i) =-rhs(0,i);
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ret(3,i) =-rhs(1,i);
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}
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};
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/*G5
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* 1 0 0 0 [0]+-[2]
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* 0 1 0 0 [1]+-[3]
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* 0 0 -1 0
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* 0 0 0 -1
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*/
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template<class vtype> inline void multGamma5(iVector<vtype,Ns> &ret, iVector<vtype,Ns> &rhs){
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ret(0) = rhs(0);
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ret(1) = rhs(1);
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ret(2) =-rhs(2);
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ret(3) =-rhs(3);
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};
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template<class vtype> inline void multMinusGamma5(iVector<vtype,Ns> &ret, iVector<vtype,Ns> &rhs){
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ret(0) =-rhs(0);
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ret(1) =-rhs(1);
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ret(2) = rhs(2);
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ret(3) = rhs(3);
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};
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template<class vtype> inline void multGamma5(iMatrix<vtype,Ns> &ret, const iMatrix<vtype,Ns> &rhs){
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for(int i=0;i<Ns;i++){
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ret(0,i) = rhs(0,i);
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ret(1,i) = rhs(1,i);
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ret(2,i) =-rhs(2,i);
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ret(3,i) =-rhs(3,i);
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}
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};
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template<class vtype> inline void multMinusGamma5(iMatrix<vtype,Ns> &ret, const iMatrix<vtype,Ns> &rhs){
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for(int i=0;i<Ns;i++){
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ret(0,i) =-rhs(0,i);
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ret(1,i) =-rhs(1,i);
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ret(2,i) = rhs(2,i);
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ret(3,i) = rhs(3,i);
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}
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};
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Operator * : first case this is not a spin index, so recurse
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// FIXME
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//
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// Optimisation; switch over to a "multGammaX(ret._internal,arg._internal)" style early and
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// note that doing so from the lattice operator will avoid copy back and case switch overhead, as
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// was done for the tensor math operator to remove operator * notation early
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//
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#ifdef GRID_WARN_SUBOPTIMAL
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#warning "Optimisation alert switch over to multGammaX early "
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#endif
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template<class vtype> inline auto operator * ( const Gamma &G,const iScalar<vtype> &arg) ->
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typename std::enable_if<matchGridTensorIndex<iScalar<vtype>,SpinIndex>::notvalue,iScalar<vtype> >::type
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{
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iScalar<vtype> ret;
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ret._internal=G*arg._internal;
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return ret;
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}
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template<class vtype,int N> inline auto operator * ( const Gamma &G,const iVector<vtype,N> &arg) ->
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typename std::enable_if<matchGridTensorIndex<iVector<vtype,N>,SpinIndex>::notvalue,iVector<vtype,N> >::type
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{
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iVector<vtype,N> ret;
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ret._internal=G*arg._internal;
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return ret;
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}
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template<class vtype,int N> inline auto operator * ( const Gamma &G,const iMatrix<vtype,N> &arg) ->
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typename std::enable_if<matchGridTensorIndex<iMatrix<vtype,N>,SpinIndex>::notvalue,iMatrix<vtype,N> >::type
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{
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iMatrix<vtype,N> ret;
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ret._internal=G*arg._internal;
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return ret;
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}
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////////////////////////////////////////////////////////
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// When we hit the spin index this matches and we stop
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////////////////////////////////////////////////////////
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template<class vtype> inline auto operator * ( const Gamma &G,const iMatrix<vtype,Ns> &arg) ->
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typename std::enable_if<matchGridTensorIndex<iMatrix<vtype,Ns>,SpinIndex>::value,iMatrix<vtype,Ns> >::type
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{
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iMatrix<vtype,Ns> ret;
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switch (G._g) {
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case Gamma::Identity:
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ret = arg;
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break;
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case Gamma::MinusIdentity:
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ret = -arg;
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break;
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case Gamma::GammaX:
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multGammaX(ret,arg);
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break;
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case Gamma::MinusGammaX:
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multMinusGammaX(ret,arg);
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break;
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case Gamma::GammaY:
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multGammaY(ret,arg);
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break;
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case Gamma::MinusGammaY:
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multMinusGammaY(ret,arg);
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break;
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case Gamma::GammaZ:
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multGammaZ(ret,arg);
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break;
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case Gamma::MinusGammaZ:
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multMinusGammaZ(ret,arg);
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break;
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case Gamma::GammaT:
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multGammaT(ret,arg);
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break;
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case Gamma::MinusGammaT:
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multMinusGammaT(ret,arg);
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break;
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case Gamma::Gamma5:
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multGamma5(ret,arg);
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break;
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case Gamma::MinusGamma5:
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multMinusGamma5(ret,arg);
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break;
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default:
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assert(0);
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break;
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}
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return ret;
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}
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/* Output from test
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./Grid_gamma
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Identity((1,0),(0,0),(0,0),(0,0))
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((0,0),(1,0),(0,0),(0,0))
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((0,0),(0,0),(1,0),(0,0))
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((0,0),(0,0),(0,0),(1,0)) OK
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GammaX ((0,0),(0,0),(0,0),(0,1))
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((0,0),(0,0),(0,1),(0,0))
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((0,0),(0,-1),(0,0),(0,0))
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((0,-1),(0,0),(0,0),(0,0)) OK
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* Gx
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* 0 0 0 i
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* 0 0 i 0
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* 0 -i 0 0
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* -i 0 0 0
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GammaY ((-0,-0),(-0,-0),(-0,-0),(-1,-0))
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((0,0),(0,0),(1,0),(0,0))
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((0,0),(1,0),(0,0),(0,0)) OK
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((-1,-0),(-0,-0),(-0,-0),(-0,-0))
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*Gy
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* 0 0 0 -1 [0] -+ [3]
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* 0 0 1 0 [1] +- [2]
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* 0 1 0 0
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* -1 0 0 0
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GammaZ ((0,0),(0,0),(0,1),(0,0))
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((0,0),(0,0),(0,0),(0,-1))
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((0,-1),(0,0),(0,0),(0,0))
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((0,0),(0,1),(0,0),(0,0)) OK
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* 0 0 i 0 [0]+-i[2]
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* 0 0 0 -i [1]-+i[3]
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* -i 0 0 0
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* 0 i 0 0
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GammaT ((0,0),(0,0),(1,0),(0,0))
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((0,0),(0,0),(0,0),(1,0)) OK
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((1,0),(0,0),(0,0),(0,0))
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((0,0),(1,0),(0,0),(0,0))
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* 0 0 1 0 [0]+-[2]
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* 0 0 0 1 [1]+-[3]
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* 1 0 0 0
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* 0 1 0 0
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Gamma5 ((1,0),(0,0),(0,0),(0,0))
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((0,0),(1,0),(0,0),(0,0))
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((-0,-0),(-0,-0),(-1,-0),(-0,-0))
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((-0,-0),(-0,-0),(-0,-0),(-1,-0))
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* 1 0 0 0 [0]+-[2]
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* 0 1 0 0 [1]+-[3] OK
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* 0 0 -1 0
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* 0 0 0 -1
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*/
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} //namespace QCD
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} // Grid
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#endif
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