mirror of
https://github.com/paboyle/Grid.git
synced 2025-11-04 05:54:32 +00:00
big cleanup of the Photon class + QED Coulomb gauge
This commit is contained in:
@@ -30,8 +30,9 @@
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namespace Grid{
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namespace QCD{
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template <class S>
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class QedGimpl
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class QedGImpl
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{
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public:
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typedef S Simd;
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@@ -43,27 +44,27 @@ namespace QCD{
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typedef iImplGaugeLink<Simd> SiteLink;
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typedef iImplGaugeField<Simd> SiteField;
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typedef SiteField SiteComplex;
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typedef SiteLink SiteComplex;
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typedef Lattice<SiteLink> LinkField;
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typedef Lattice<SiteField> Field;
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typedef Field ComplexField;
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};
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typedef QedGimpl<vComplex> QedGimplR;
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typedef QedGImpl<vComplex> QedGImplR;
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template<class Gimpl>
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template <class GImpl>
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class Photon
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{
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public:
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INHERIT_GIMPL_TYPES(Gimpl);
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INHERIT_GIMPL_TYPES(GImpl);
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typedef typename SiteGaugeLink::scalar_object ScalarSite;
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typedef typename ScalarSite::scalar_type ScalarComplex;
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GRID_SERIALIZABLE_ENUM(Gauge, undef, feynman, 1, coulomb, 2, landau, 3);
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GRID_SERIALIZABLE_ENUM(ZmScheme, undef, qedL, 1, qedTL, 2, qedInf, 3);
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GRID_SERIALIZABLE_ENUM(ZmScheme, undef, qedL, 1, qedTL, 2);
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public:
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Photon(Gauge gauge, ZmScheme zmScheme);
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Photon(Gauge gauge, ZmScheme zmScheme, std::vector<Real> improvements);
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Photon(Gauge gauge, ZmScheme zmScheme, Real G0);
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Photon(Gauge gauge, ZmScheme zmScheme, std::vector<Real> improvements, Real G0);
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Photon(GridBase *grid, Gauge gauge, ZmScheme zmScheme, std::vector<Real> improvement);
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Photon(GridBase *grid, Gauge gauge, ZmScheme zmScheme);
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virtual ~Photon(void) = default;
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void FreePropagator(const GaugeField &in, GaugeField &out);
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void MomentumSpacePropagator(const GaugeField &in, GaugeField &out);
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@@ -73,345 +74,252 @@ namespace QCD{
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const GaugeLinkField &weight);
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void UnitField(GaugeField &out);
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private:
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void infVolPropagator(GaugeLinkField &out);
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void invKHatSquared(GaugeLinkField &out);
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void makeSpatialNorm(LatticeInteger &spNrm);
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void makeKHat(std::vector<GaugeLinkField> &khat);
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void makeInvKHatSquared(GaugeLinkField &out);
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void zmSub(GaugeLinkField &out);
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void transverseProjectSpatial(GaugeField &out);
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void gaugeTransform(GaugeField &out);
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private:
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GridBase *grid_;
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Gauge gauge_;
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ZmScheme zmScheme_;
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std::vector<Real> improvement_;
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Real G0_;
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};
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typedef Photon<QedGimplR> PhotonR;
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typedef Photon<QedGImplR> PhotonR;
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template<class Gimpl>
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Photon<Gimpl>::Photon(Gauge gauge, ZmScheme zmScheme)
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: gauge_(gauge), zmScheme_(zmScheme), improvement_(std::vector<Real>()),
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G0_(0.15493339023106021408483720810737508876916113364521)
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{}
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template<class Gimpl>
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Photon<Gimpl>::Photon(Gauge gauge, ZmScheme zmScheme,
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template<class GImpl>
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Photon<GImpl>::Photon(GridBase *grid, Gauge gauge, ZmScheme zmScheme,
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std::vector<Real> improvements)
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: gauge_(gauge), zmScheme_(zmScheme), improvement_(improvements),
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G0_(0.15493339023106021408483720810737508876916113364521)
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: grid_(grid), gauge_(gauge), zmScheme_(zmScheme), improvement_(improvements)
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{}
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template<class Gimpl>
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Photon<Gimpl>::Photon(Gauge gauge, ZmScheme zmScheme, Real G0)
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: gauge_(gauge), zmScheme_(zmScheme), improvement_(std::vector<Real>()), G0_(G0)
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template<class GImpl>
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Photon<GImpl>::Photon(GridBase *grid, Gauge gauge, ZmScheme zmScheme)
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: Photon(grid, gauge, zmScheme, std::vector<Real>())
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{}
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template<class Gimpl>
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Photon<Gimpl>::Photon(Gauge gauge, ZmScheme zmScheme,
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std::vector<Real> improvements, Real G0)
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: gauge_(gauge), zmScheme_(zmScheme), improvement_(improvements), G0_(G0)
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{}
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template<class Gimpl>
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void Photon<Gimpl>::FreePropagator (const GaugeField &in,GaugeField &out)
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template<class GImpl>
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void Photon<GImpl>::FreePropagator(const GaugeField &in, GaugeField &out)
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{
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FFT theFFT(in._grid);
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FFT theFFT(dynamic_cast<GridCartesian *>(grid_));
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GaugeField in_k(grid_);
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GaugeField prop_k(grid_);
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GaugeField in_k(in._grid);
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GaugeField prop_k(in._grid);
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theFFT.FFT_all_dim(in_k,in,FFT::forward);
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MomentumSpacePropagator(prop_k,in_k);
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theFFT.FFT_all_dim(out,prop_k,FFT::backward);
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theFFT.FFT_all_dim(in_k, in, FFT::forward);
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MomentumSpacePropagator(prop_k, in_k);
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theFFT.FFT_all_dim(out, prop_k, FFT::backward);
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}
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template<class Gimpl>
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void Photon<Gimpl>::infVolPropagator(GaugeLinkField &out)
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template<class GImpl>
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void Photon<GImpl>::makeSpatialNorm(LatticeInteger &spNrm)
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{
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auto *grid = dynamic_cast<GridCartesian *>(out._grid);
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LatticeReal xmu(grid);
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GaugeLinkField one(grid);
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const unsigned int nd = grid->_ndimension;
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std::vector<int> &l = grid->_fdimensions;
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std::vector<int> x0(nd,0);
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TComplex Tone = Complex(1.0,0.0);
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TComplex Tzero = Complex(G0_,0.0);
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FFT fft(grid);
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LatticeInteger coor(grid_);
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std::vector<int> l = grid_->FullDimensions();
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one = Complex(1.0,0.0);
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out = zero;
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for(int mu = 0; mu < nd; mu++)
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spNrm = zero;
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for(int mu = 0; mu < grid_->Nd() - 1; mu++)
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{
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LatticeCoordinate(xmu,mu);
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Real lo2 = l[mu]/2.0;
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xmu = where(xmu < lo2, xmu, xmu-double(l[mu]));
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out = out + toComplex(4*M_PI*M_PI*xmu*xmu);
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LatticeCoordinate(coor, mu);
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coor = where(coor < Integer(l[mu]/2), coor, coor - Integer(l[mu]));
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spNrm = spNrm + coor*coor;
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}
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pokeSite(Tone, out, x0);
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out = one/out;
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pokeSite(Tzero, out, x0);
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fft.FFT_all_dim(out, out, FFT::forward);
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}
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template<class Gimpl>
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void Photon<Gimpl>::invKHatSquared(GaugeLinkField &out)
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template<class GImpl>
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void Photon<GImpl>::makeKHat(std::vector<GaugeLinkField> &khat)
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{
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GridBase *grid = out._grid;
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GaugeLinkField kmu(grid), one(grid);
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const unsigned int nd = grid->_ndimension;
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std::vector<int> &l = grid->_fdimensions;
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std::vector<int> zm(nd,0);
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TComplex Tone = Complex(1.0,0.0);
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TComplex Tzero= Complex(0.0,0.0);
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const unsigned int nd = grid_->Nd();
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std::vector<int> l = grid_->FullDimensions();
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Complex ci(0., 1.);
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one = Complex(1.0,0.0);
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out = zero;
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for(int mu = 0; mu < nd; mu++)
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khat.resize(nd, grid_);
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for (unsigned int mu = 0; mu < nd; ++mu)
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{
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Real twoPiL = M_PI*2./l[mu];
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LatticeCoordinate(kmu,mu);
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kmu = 2.*sin(.5*twoPiL*kmu);
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out = out + kmu*kmu;
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LatticeCoordinate(khat[mu], mu);
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khat[mu] = exp(0.5*ci*khat[mu])*2.*sin(.5*twoPiL*khat[mu]);
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}
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pokeSite(Tone, out, zm);
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out = one/out;
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pokeSite(Tzero, out, zm);
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}
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template<class Gimpl>
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void Photon<Gimpl>::zmSub(GaugeLinkField &out)
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template<class GImpl>
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void Photon<GImpl>::makeInvKHatSquared(GaugeLinkField &out)
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{
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GridBase *grid = out._grid;
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const unsigned int nd = grid->_ndimension;
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std::vector<int> &l = grid->_fdimensions;
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std::vector<GaugeLinkField> khat;
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GaugeLinkField lone(grid_);
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const unsigned int nd = grid_->Nd();
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std::vector<int> zm(nd, 0);
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ScalarSite one = ScalarComplex(1., 0.), z = ScalarComplex(0., 0.);
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out = zero;
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makeKHat(khat);
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for(int mu = 0; mu < nd; mu++)
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{
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out = out + khat[mu]*conjugate(khat[mu]);
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}
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lone = ScalarComplex(1., 0.);
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pokeSite(one, out, zm);
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out = lone/out;
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pokeSite(z, out, zm);
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}
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template<class GImpl>
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void Photon<GImpl>::zmSub(GaugeLinkField &out)
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{
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switch (zmScheme_)
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{
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case ZmScheme::qedTL:
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{
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std::vector<int> zm(nd,0);
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TComplex Tzero = Complex(0.0,0.0);
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pokeSite(Tzero, out, zm);
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std::vector<int> zm(grid_->Nd(), 0);
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ScalarSite z = ScalarComplex(0., 0.);
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pokeSite(z, out, zm);
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break;
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}
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case ZmScheme::qedL:
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{
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LatticeInteger spNrm(grid), coor(grid);
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GaugeLinkField z(grid);
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LatticeInteger spNrm(grid_);
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spNrm = zero;
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for(int d = 0; d < grid->_ndimension - 1; d++)
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{
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LatticeCoordinate(coor,d);
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coor = where(coor < Integer(l[d]/2), coor, coor-Integer(l[d]));
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spNrm = spNrm + coor*coor;
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}
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makeSpatialNorm(spNrm);
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out = where(spNrm == Integer(0), 0.*out, out);
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// IR improvement
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for(int i = 0; i < improvement_.size(); i++)
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{
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Real f = sqrt(improvement_[i]+1);
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out = where(spNrm == Integer(i+1), f*out, out);
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Real f = sqrt(improvement_[i] + 1);
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out = where(spNrm == Integer(i + 1), f*out, out);
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}
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}
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default:
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assert(0);
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break;
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}
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}
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template<class Gimpl>
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void Photon<Gimpl>::MomentumSpacePropagator(const GaugeField &in,
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template<class GImpl>
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void Photon<GImpl>::transverseProjectSpatial(GaugeField &out)
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{
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const unsigned int nd = grid_->Nd();
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GaugeLinkField invKHat(grid_), cst(grid_);
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LatticeInteger spNrm(grid_);
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std::vector<GaugeLinkField> khat, a(nd, grid_), aProj(nd, grid_);
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invKHat = zero;
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makeSpatialNorm(spNrm);
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makeKHat(khat);
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for (unsigned int mu = 0; mu < nd; ++mu)
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{
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a[mu] = peekLorentz(out, mu);
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if (mu < nd - 1)
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{
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invKHat += khat[mu]*conjugate(khat[mu]);
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}
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}
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cst = ScalarComplex(1., 0.);
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invKHat = where(spNrm == Integer(0), cst, invKHat);
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invKHat = cst/invKHat;
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cst = zero;
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invKHat = where(spNrm == Integer(0), cst, invKHat);
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for (unsigned int mu = 0; mu < nd; ++mu)
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{
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aProj[mu] = a[mu];
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for (unsigned int nu = 0; nu < nd - 1; ++nu)
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{
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aProj[mu] -= invKHat*khat[mu]*conjugate(khat[nu])*a[nu];
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}
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pokeLorentz(out, aProj[mu], mu);
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}
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}
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template<class GImpl>
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void Photon<GImpl>::gaugeTransform(GaugeField &out)
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{
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switch (gauge_)
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{
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case Gauge::feynman:
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break;
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case Gauge::coulomb:
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transverseProjectSpatial(out);
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break;
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case Gauge::landau:
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assert(0);
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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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}
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template<class GImpl>
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void Photon<GImpl>::MomentumSpacePropagator(const GaugeField &in,
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GaugeField &out)
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{
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GridBase *grid = out._grid;
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LatticeComplex momProp(grid);
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LatticeComplex momProp(grid_);
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switch (zmScheme_)
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{
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case ZmScheme::qedTL:
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case ZmScheme::qedL:
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{
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invKHatSquared(momProp);
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makeInvKHatSquared(momProp);
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zmSub(momProp);
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break;
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}
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case ZmScheme::qedInf:
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{
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infVolPropagator(momProp);
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break;
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}
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default:
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break;
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}
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out = in*momProp;
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}
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template<class Gimpl>
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void Photon<Gimpl>::StochasticWeight(GaugeLinkField &weight)
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{
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auto *grid = dynamic_cast<GridCartesian *>(weight._grid);
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const unsigned int nd = grid->_ndimension;
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std::vector<int> latt_size = grid->_fdimensions;
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switch (zmScheme_)
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{
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case ZmScheme::qedTL:
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case ZmScheme::qedL:
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template<class GImpl>
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void Photon<GImpl>::StochasticWeight(GaugeLinkField &weight)
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{
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const unsigned int nd = grid_->Nd();
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std::vector<int> l = grid_->FullDimensions();
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Integer vol = 1;
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for(int d = 0; d < nd; d++)
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for(unsigned int mu = 0; mu < nd; mu++)
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{
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vol = vol * latt_size[d];
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vol = vol*l[mu];
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}
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invKHatSquared(weight);
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makeInvKHatSquared(weight);
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weight = sqrt(vol)*sqrt(weight);
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zmSub(weight);
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break;
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}
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case ZmScheme::qedInf:
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{
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infVolPropagator(weight);
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weight = sqrt(real(weight));
|
||||
break;
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||||
}
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||||
default:
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||||
break;
|
||||
}
|
||||
}
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||||
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template<class Gimpl>
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void Photon<Gimpl>::StochasticField(GaugeField &out, GridParallelRNG &rng)
|
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template<class GImpl>
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void Photon<GImpl>::StochasticField(GaugeField &out, GridParallelRNG &rng)
|
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{
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auto *grid = dynamic_cast<GridCartesian *>(out._grid);
|
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GaugeLinkField weight(grid);
|
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GaugeLinkField weight(grid_);
|
||||
|
||||
StochasticWeight(weight);
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StochasticField(out, rng, weight);
|
||||
}
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||||
|
||||
template<class Gimpl>
|
||||
void Photon<Gimpl>::StochasticField(GaugeField &out, GridParallelRNG &rng,
|
||||
template<class GImpl>
|
||||
void Photon<GImpl>::StochasticField(GaugeField &out, GridParallelRNG &rng,
|
||||
const GaugeLinkField &weight)
|
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{
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auto *grid = dynamic_cast<GridCartesian *>(out._grid);
|
||||
const unsigned int nd = grid->_ndimension;
|
||||
GaugeLinkField r(grid);
|
||||
GaugeField aTilde(grid);
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||||
FFT fft(grid);
|
||||
const unsigned int nd = grid_->Nd();
|
||||
GaugeLinkField r(grid_);
|
||||
GaugeField aTilde(grid_);
|
||||
FFT fft(dynamic_cast<GridCartesian *>(grid_));
|
||||
|
||||
switch (zmScheme_)
|
||||
{
|
||||
case ZmScheme::qedTL:
|
||||
case ZmScheme::qedL:
|
||||
{
|
||||
for(int mu = 0; mu < nd; mu++)
|
||||
for(unsigned int mu = 0; mu < nd; mu++)
|
||||
{
|
||||
gaussian(rng, r);
|
||||
r = weight*r;
|
||||
pokeLorentz(aTilde, r, mu);
|
||||
}
|
||||
break;
|
||||
}
|
||||
case ZmScheme::qedInf:
|
||||
{
|
||||
Complex shift(1., 1.); // This needs to be a GaugeLink element?
|
||||
for(int mu = 0; mu < nd; mu++)
|
||||
{
|
||||
bernoulli(rng, r);
|
||||
r = weight*(2.*r - shift);
|
||||
pokeLorentz(aTilde, r, mu);
|
||||
}
|
||||
break;
|
||||
}
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
gaugeTransform(aTilde);
|
||||
fft.FFT_all_dim(out, aTilde, FFT::backward);
|
||||
|
||||
out = real(out);
|
||||
}
|
||||
|
||||
template<class Gimpl>
|
||||
void Photon<Gimpl>::UnitField(GaugeField &out)
|
||||
template<class GImpl>
|
||||
void Photon<GImpl>::UnitField(GaugeField &out)
|
||||
{
|
||||
auto *grid = dynamic_cast<GridCartesian *>(out._grid);
|
||||
const unsigned int nd = grid->_ndimension;
|
||||
GaugeLinkField r(grid);
|
||||
const unsigned int nd = grid_->Nd();
|
||||
GaugeLinkField r(grid_);
|
||||
|
||||
r = Complex(1.0,0.0);
|
||||
|
||||
for(int mu = 0; mu < nd; mu++)
|
||||
r = ScalarComplex(1., 0.);
|
||||
for(unsigned int mu = 0; mu < nd; mu++)
|
||||
{
|
||||
pokeLorentz(out, r, mu);
|
||||
}
|
||||
|
||||
out = real(out);
|
||||
}
|
||||
// template<class Gimpl>
|
||||
// void Photon<Gimpl>::FeynmanGaugeMomentumSpacePropagator_L(GaugeField &out,
|
||||
// const GaugeField &in)
|
||||
// {
|
||||
//
|
||||
// FeynmanGaugeMomentumSpacePropagator_TL(out,in);
|
||||
//
|
||||
// GridBase *grid = out._grid;
|
||||
// LatticeInteger coor(grid);
|
||||
// GaugeField zz(grid); zz=zero;
|
||||
//
|
||||
// // xyzt
|
||||
// for(int d = 0; d < grid->_ndimension-1;d++){
|
||||
// LatticeCoordinate(coor,d);
|
||||
// out = where(coor==Integer(0),zz,out);
|
||||
// }
|
||||
// }
|
||||
//
|
||||
// template<class Gimpl>
|
||||
// void Photon<Gimpl>::FeynmanGaugeMomentumSpacePropagator_TL(GaugeField &out,
|
||||
// const GaugeField &in)
|
||||
// {
|
||||
//
|
||||
// // what type LatticeComplex
|
||||
// GridBase *grid = out._grid;
|
||||
// int nd = grid->_ndimension;
|
||||
//
|
||||
// typedef typename GaugeField::vector_type vector_type;
|
||||
// typedef typename GaugeField::scalar_type ScalComplex;
|
||||
// typedef Lattice<iSinglet<vector_type> > LatComplex;
|
||||
//
|
||||
// std::vector<int> latt_size = grid->_fdimensions;
|
||||
//
|
||||
// LatComplex denom(grid); denom= zero;
|
||||
// LatComplex one(grid); one = ScalComplex(1.0,0.0);
|
||||
// LatComplex kmu(grid);
|
||||
//
|
||||
// ScalComplex ci(0.0,1.0);
|
||||
// // momphase = n * 2pi / L
|
||||
// for(int mu=0;mu<Nd;mu++) {
|
||||
//
|
||||
// LatticeCoordinate(kmu,mu);
|
||||
//
|
||||
// RealD TwoPiL = M_PI * 2.0/ latt_size[mu];
|
||||
//
|
||||
// kmu = TwoPiL * kmu ;
|
||||
//
|
||||
// denom = denom + 4.0*sin(kmu*0.5)*sin(kmu*0.5); // Wilson term
|
||||
// }
|
||||
// std::vector<int> zero_mode(nd,0);
|
||||
// TComplexD Tone = ComplexD(1.0,0.0);
|
||||
// TComplexD Tzero= ComplexD(0.0,0.0);
|
||||
//
|
||||
// pokeSite(Tone,denom,zero_mode);
|
||||
//
|
||||
// denom= one/denom;
|
||||
//
|
||||
// pokeSite(Tzero,denom,zero_mode);
|
||||
//
|
||||
// out = zero;
|
||||
// out = in*denom;
|
||||
// };
|
||||
|
||||
}}
|
||||
#endif
|
||||
|
||||
@@ -70,7 +70,7 @@ void TStochEm::execute(void)
|
||||
LOG(Message) << "Generating stochastic EM potential..." << std::endl;
|
||||
|
||||
std::vector<Real> improvements = strToVec<Real>(par().improvement);
|
||||
PhotonR photon(par().gauge, par().zmScheme, improvements, par().G0_qedInf);
|
||||
PhotonR photon(envGetGrid(EmField), par().gauge, par().zmScheme, improvements);
|
||||
auto &a = envGet(EmField, getName());
|
||||
auto &w = envGet(EmComp, "_" + getName() + "_weight");
|
||||
|
||||
|
||||
@@ -47,8 +47,7 @@ public:
|
||||
GRID_SERIALIZABLE_CLASS_MEMBERS(StochEmPar,
|
||||
PhotonR::Gauge, gauge,
|
||||
PhotonR::ZmScheme, zmScheme,
|
||||
std::string, improvement,
|
||||
Real, G0_qedInf);
|
||||
std::string, improvement);
|
||||
};
|
||||
|
||||
class TStochEm: public Module<StochEmPar>
|
||||
|
||||
@@ -62,7 +62,7 @@ void TUnitEm::setup(void)
|
||||
// execution ///////////////////////////////////////////////////////////////////
|
||||
void TUnitEm::execute(void)
|
||||
{
|
||||
PhotonR photon(0, 0); // Just chose arbitrary input values here
|
||||
PhotonR photon(envGetGrid(EmField), 0, 0); // Just chose arbitrary input values here
|
||||
auto &a = envGet(EmField, getName());
|
||||
LOG(Message) << "Generating unit EM potential..." << std::endl;
|
||||
photon.UnitField(a);
|
||||
|
||||
Reference in New Issue
Block a user