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Adding force terms

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This commit is contained in:
Guido Cossu
2017-03-27 16:43:15 +09:00
parent fff484eca5
commit 5e549ebd8b
4 changed files with 88 additions and 3 deletions
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50
lib/qcd/utils/WilsonLoops.h
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@@ -256,6 +256,56 @@ public:
}
}
////////////////////////////////////////////////////////////////////////
// the sum over all staples on each site in direction mu,nu, lower part
////////////////////////////////////////////////////////////////////////
static void StapleLower(GaugeMat &staple, const GaugeLorentz &Umu, int mu,
int nu) {
if (nu != mu) {
GridBase *grid = Umu._grid;
std::vector<GaugeMat> U(Nd, grid);
for (int d = 0; d < Nd; d++) {
U[d] = PeekIndex<LorentzIndex>(Umu, d);// some redundant copies
}
// mu
// ^
// |__> nu
// __
// |
// |__
//
//
staple = Gimpl::ShiftStaple(
Gimpl::CovShiftBackward(U[nu], nu,
Gimpl::CovShiftBackward(U[mu], mu, U[nu])),
mu);
}
}
//////////////////////////////////////////////////////
// Field Strength
//////////////////////////////////////////////////////
static void FieldStrength(GaugeMat &FS, const GaugeLorentz &Umu, int mu, int nu){
// Fmn +--<--+ Ut +--<--+
// | | | |
// (x)+-->--+ +-->--+(x)
// | | | |
// +--<--+ +--<--+
GaugeMat Vup(Umu._grid), Vdn(Umu._grid);
StapleUpper(Vup, Umu, mu, nu);// coalesce these two (up low)
StapleLower(Vdn, Umu, mu, nu);
GaugeMat v = adj(Vup) - adj(Vdn);
GaugeMat u = PeekIndex<LorentzIndex>(Umu, mu); // some redundant copies
GaugeMat vu = v*u;
FS = 0.25*Ta(u*v - Cshift(vu, mu, +1));
}
//////////////////////////////////////////////////////
// Similar to above for rectangle is required
//////////////////////////////////////////////////////