portelli/Grid
1
0
Fork 0
mirror of https://github.com/paboyle/Grid.git synced 2024-11-09 23:45:36 +00:00
Code Releases Activity

Added topological charge measurement

Browse Source
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lib/qcd/QCD.h
View File

@ -34,6 +34,10 @@ Author: paboyle <paboyle@ph.ed.ac.uk>
namespace Grid{
namespace QCD {
static const int Xdir = 0;
static const int Ydir = 1;
static const int Zdir = 2;
static const int Tdir = 3;
static const int Xp = 0;
static const int Yp = 1;

16
lib/qcd/modules/ObservableModules.h
View File

@ -94,6 +94,22 @@ class PlaquetteMod: public ObservableModule<PlaquetteLogger<Impl>, NoParameters>
PlaquetteMod(): ObsBase(NoParameters()){}
};
template < class Impl >
class TopologicalChargeMod: public ObservableModule<TopologicalCharge<Impl>, NoParameters>{
typedef ObservableModule<TopologicalCharge<Impl>, NoParameters> ObsBase;
using ObsBase::ObsBase; // for constructors
// acquire resource
virtual void initialize(){
this->ObservablePtr.reset(new TopologicalCharge<Impl>());
}
public:
TopologicalChargeMod(): ObsBase(NoParameters()){}
};
}// QCD temporarily here

1
lib/qcd/observables/hmc_observable.h
View File

@ -44,5 +44,6 @@ class HmcObservable {
} // namespace Grid
#include "plaquette.h"
#include "topological_charge.h"
#endif // HMC_OBSERVABLE_H

3
lib/qcd/observables/plaquette.h
View File

@ -36,9 +36,6 @@ namespace QCD {
// this is only defined for a gauge theory
template <class Impl>
class PlaquetteLogger : public HmcObservable<typename Impl::Field> {
private:
std::string Stem;
public:
// here forces the Impl to be of gauge fields
// if not the compiler will complain

47
lib/qcd/observables/topological_charge.h
View File

@ -31,19 +31,54 @@ directory
#define HMC_TOP_CHARGE_H
namespace Grid {
namespace QCD (
namespace QCD {
// this is only defined for a gauge theory
template <class Impl>
class TopologicalCharge : public HmcObservable<typename Impl::Field> {
private:
std::string Stem;
public:
// here forces the Impl to be of gauge fields
// if not the compiler will complain
INHERIT_GIMPL_TYPES(Impl);
// necessary for HmcObservable compatibility
typedef typename Impl::Field Field;
void TrajectoryComplete(int traj,
Field &U,
GridSerialRNG &sRNG,
GridParallelRNG &pRNG) {
// 4d topological charge
// Bx = -iF(y,z), By = -iF(z,y), Bz = -iF(x,y)
GaugeLinkField Bx(U._grid), By(U._grid), Bz(U._grid);
WilsonLoops<Impl>::FieldStrength(Bx, U, Ydir, Zdir);
WilsonLoops<Impl>::FieldStrength(By, U, Zdir, Xdir);
WilsonLoops<Impl>::FieldStrength(Bz, U, Xdir, Ydir);
// Ex = -iF(t,x), Ey = -iF(t,y), Ez = -iF(t,z)
GaugeLinkField Ex(U._grid), Ey(U._grid), Ez(U._grid);
WilsonLoops<Impl>::FieldStrength(Ex, U, Tdir, Xdir);
WilsonLoops<Impl>::FieldStrength(Ey, U, Tdir, Ydir);
WilsonLoops<Impl>::FieldStrength(Ez, U, Tdir, Zdir);
double coeff = 8.0/(32.0*M_PI*M_PI);
LatticeComplex qfield = coeff*trace(Bx*Ex + By*Ey + Bz*Ez);
TComplex Tq = sum(qfield);
Real q = TensorRemove(Tq).real();
int def_prec = std::cout.precision();
std::cout << GridLogMessage
<< std::setprecision(std::numeric_limits<Real>::digits10 + 1)
<< "Topological Charge: [ " << traj << " ] "<< q << std::endl;
std::cout.precision(def_prec);
}
};
)
}
}
#endif // HMC_TOP_CHARGE_H

32
lib/qcd/utils/WilsonLoops.h
View File

@ -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
//////////////////////////////////////////////////////

2
tests/hmc/Test_hmc_WilsonGauge.cc
View File

@ -66,7 +66,9 @@ int main(int argc, char **argv) {
// Construct observables
// here there is too much indirection
typedef PlaquetteMod<HMCWrapper::ImplPolicy> PlaqObs;
typedef TopologicalChargeMod<HMCWrapper::ImplPolicy> QObs;
TheHMC.Resources.AddObservable<PlaqObs>();
TheHMC.Resources.AddObservable<QObs>();
//////////////////////////////////////////////
/////////////////////////////////////////////////////////////