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Added topological charge measurement

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This commit is contained in:
Guido Cossu
2017-03-17 16:14:57 +09:00
parent 91886068fe
commit 3d0fe15374
7 changed files with 87 additions and 18 deletions
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32
lib/qcd/utils/WilsonLoops.h
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@ -228,8 +228,7 @@ public:
//
staple += Gimpl::ShiftStaple(
Gimpl::CovShiftBackward(U[nu], nu,
Gimpl::CovShiftBackward(U[mu], mu, U[nu])),
mu);
Gimpl::CovShiftBackward(U[mu], mu, U[nu])), mu);
}
}
}
@ -239,9 +238,6 @@ public:
//////////////////////////////////////////////////
static void StapleUpper(GaugeMat &staple, const GaugeLorentz &Umu, int mu,
int nu) {
staple = zero;
if (nu != mu) {
GridBase *grid = Umu._grid;
@ -259,7 +255,7 @@ public:
// __|
//
staple += Gimpl::ShiftStaple(
staple = Gimpl::ShiftStaple(
Gimpl::CovShiftForward(
U[nu], nu,
Gimpl::CovShiftBackward(
@ -273,8 +269,6 @@ public:
//////////////////////////////////////////////////
static void StapleLower(GaugeMat &staple, const GaugeLorentz &Umu, int mu,
int nu) {
staple = zero;
if (nu != mu) {
GridBase *grid = Umu._grid;
@ -292,13 +286,33 @@ public:
// |__
//
//
staple += Gimpl::ShiftStaple(
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);
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
//////////////////////////////////////////////////////