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354 lines
11 KiB
C++
354 lines
11 KiB
C++
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/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/qcd/action/fermion/WilsonFermion.cc
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Copyright (C) 2015
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Author: Peter Boyle <pabobyle@ph.ed.ac.uk>
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Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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Author: Peter Boyle <peterboyle@Peters-MacBook-Pro-2.local>
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Author: paboyle <paboyle@ph.ed.ac.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution
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directory
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*************************************************************************************/
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/* END LEGAL */
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#include <Grid/qcd/action/fermion/FermionCore.h>
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#include <Grid/qcd/action/fermion/WilsonFermion.h>
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namespace Grid {
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namespace QCD {
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const std::vector<int> WilsonFermionStatic::directions({0, 1, 2, 3, 0, 1, 2, 3});
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const std::vector<int> WilsonFermionStatic::displacements({1, 1, 1, 1, -1, -1, -1, -1});
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int WilsonFermionStatic::HandOptDslash;
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/////////////////////////////////
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// Constructor and gauge import
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/////////////////////////////////
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template <class Impl>
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WilsonFermion<Impl>::WilsonFermion(GaugeField &_Umu, GridCartesian &Fgrid,
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GridRedBlackCartesian &Hgrid, RealD _mass,
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const ImplParams &p)
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: Kernels(p),
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_grid(&Fgrid),
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_cbgrid(&Hgrid),
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Stencil(&Fgrid, npoint, Even, directions, displacements),
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StencilEven(&Hgrid, npoint, Even, directions,displacements), // source is Even
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StencilOdd(&Hgrid, npoint, Odd, directions,displacements), // source is Odd
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mass(_mass),
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Lebesgue(_grid),
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LebesgueEvenOdd(_cbgrid),
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Umu(&Fgrid),
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UmuEven(&Hgrid),
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UmuOdd(&Hgrid),
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_tmp(&Hgrid)
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{
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// Allocate the required comms buffer
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ImportGauge(_Umu);
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}
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template <class Impl>
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void WilsonFermion<Impl>::ImportGauge(const GaugeField &_Umu) {
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GaugeField HUmu(_Umu._grid);
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HUmu = _Umu * (-0.5);
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Impl::DoubleStore(GaugeGrid(), Umu, HUmu);
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pickCheckerboard(Even, UmuEven, Umu);
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pickCheckerboard(Odd, UmuOdd, Umu);
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}
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/////////////////////////////
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// Implement the interface
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/////////////////////////////
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template <class Impl>
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RealD WilsonFermion<Impl>::M(const FermionField &in, FermionField &out) {
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out.checkerboard = in.checkerboard;
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Dhop(in, out, DaggerNo);
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return axpy_norm(out, 4 + mass, in, out);
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}
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template <class Impl>
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RealD WilsonFermion<Impl>::Mdag(const FermionField &in, FermionField &out) {
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out.checkerboard = in.checkerboard;
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Dhop(in, out, DaggerYes);
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return axpy_norm(out, 4 + mass, in, out);
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}
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template <class Impl>
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void WilsonFermion<Impl>::Meooe(const FermionField &in, FermionField &out) {
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if (in.checkerboard == Odd) {
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DhopEO(in, out, DaggerNo);
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} else {
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DhopOE(in, out, DaggerNo);
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}
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}
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template <class Impl>
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void WilsonFermion<Impl>::MeooeDag(const FermionField &in, FermionField &out) {
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if (in.checkerboard == Odd) {
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DhopEO(in, out, DaggerYes);
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} else {
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DhopOE(in, out, DaggerYes);
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}
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}
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template <class Impl>
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void WilsonFermion<Impl>::Mooee(const FermionField &in, FermionField &out) {
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out.checkerboard = in.checkerboard;
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typename FermionField::scalar_type scal(4.0 + mass);
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out = scal * in;
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}
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template <class Impl>
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void WilsonFermion<Impl>::MooeeDag(const FermionField &in, FermionField &out) {
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out.checkerboard = in.checkerboard;
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Mooee(in, out);
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}
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template<class Impl>
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void WilsonFermion<Impl>::MooeeInv(const FermionField &in, FermionField &out) {
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out.checkerboard = in.checkerboard;
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out = (1.0/(4.0+mass))*in;
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}
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template<class Impl>
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void WilsonFermion<Impl>::MooeeInvDag(const FermionField &in, FermionField &out) {
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out.checkerboard = in.checkerboard;
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MooeeInv(in,out);
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}
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template<class Impl>
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void WilsonFermion<Impl>::MomentumSpacePropagator(FermionField &out, const FermionField &in,RealD _m)
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{
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typedef typename FermionField::vector_type vector_type;
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typedef typename FermionField::scalar_type ScalComplex;
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typedef Lattice<iSinglet<vector_type> > LatComplex;
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// what type LatticeComplex
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conformable(_grid,out._grid);
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Gamma::Algebra Gmu [] = {
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Gamma::Algebra::GammaX,
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Gamma::Algebra::GammaY,
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Gamma::Algebra::GammaZ,
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Gamma::Algebra::GammaT
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};
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std::vector<int> latt_size = _grid->_fdimensions;
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FermionField num (_grid); num = zero;
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LatComplex wilson(_grid); wilson= zero;
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LatComplex one (_grid); one = ScalComplex(1.0,0.0);
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LatComplex denom(_grid); denom= zero;
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LatComplex kmu(_grid);
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ScalComplex ci(0.0,1.0);
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// momphase = n * 2pi / L
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for(int mu=0;mu<Nd;mu++) {
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LatticeCoordinate(kmu,mu);
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RealD TwoPiL = M_PI * 2.0/ latt_size[mu];
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kmu = TwoPiL * kmu;
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wilson = wilson + 2.0*sin(kmu*0.5)*sin(kmu*0.5); // Wilson term
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num = num - sin(kmu)*ci*(Gamma(Gmu[mu])*in); // derivative term
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denom=denom + sin(kmu)*sin(kmu);
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}
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wilson = wilson + _m; // 2 sin^2 k/2 + m
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num = num + wilson*in; // -i gmu sin k + 2 sin^2 k/2 + m
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denom= denom+wilson*wilson; // sin^2 k + (2 sin^2 k/2 + m)^2
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denom= one/denom;
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out = num*denom; // [ -i gmu sin k + 2 sin^2 k/2 + m] / [ sin^2 k + (2 sin^2 k/2 + m)^2 ]
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}
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///////////////////////////////////
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// Internal
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///////////////////////////////////
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template <class Impl>
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void WilsonFermion<Impl>::DerivInternal(StencilImpl &st, DoubledGaugeField &U,
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GaugeField &mat, const FermionField &A,
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const FermionField &B, int dag) {
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assert((dag == DaggerNo) || (dag == DaggerYes));
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Compressor compressor(dag);
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FermionField Btilde(B._grid);
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FermionField Atilde(B._grid);
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Atilde = A;
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st.HaloExchange(B, compressor);
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for (int mu = 0; mu < Nd; mu++) {
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////////////////////////////////////////////////////////////////////////
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// Flip gamma (1+g)<->(1-g) if dag
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////////////////////////////////////////////////////////////////////////
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int gamma = mu;
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if (!dag) gamma += Nd;
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////////////////////////
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// Call the single hop
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////////////////////////
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parallel_for (int sss = 0; sss < B._grid->oSites(); sss++) {
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Kernels::DhopDir(st, U, st.CommBuf(), sss, sss, B, Btilde, mu, gamma);
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}
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//////////////////////////////////////////////////
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// spin trace outer product
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//////////////////////////////////////////////////
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Impl::InsertForce4D(mat, Btilde, Atilde, mu);
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}
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}
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template <class Impl>
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void WilsonFermion<Impl>::DhopDeriv(GaugeField &mat, const FermionField &U, const FermionField &V, int dag) {
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conformable(U._grid, _grid);
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conformable(U._grid, V._grid);
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conformable(U._grid, mat._grid);
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mat.checkerboard = U.checkerboard;
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DerivInternal(Stencil, Umu, mat, U, V, dag);
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}
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template <class Impl>
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void WilsonFermion<Impl>::DhopDerivOE(GaugeField &mat, const FermionField &U, const FermionField &V, int dag) {
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conformable(U._grid, _cbgrid);
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conformable(U._grid, V._grid);
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//conformable(U._grid, mat._grid); not general, leaving as a comment (Guido)
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// Motivation: look at the SchurDiff operator
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assert(V.checkerboard == Even);
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assert(U.checkerboard == Odd);
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mat.checkerboard = Odd;
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DerivInternal(StencilEven, UmuOdd, mat, U, V, dag);
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}
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template <class Impl>
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void WilsonFermion<Impl>::DhopDerivEO(GaugeField &mat, const FermionField &U, const FermionField &V, int dag) {
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conformable(U._grid, _cbgrid);
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conformable(U._grid, V._grid);
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//conformable(U._grid, mat._grid);
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assert(V.checkerboard == Odd);
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assert(U.checkerboard == Even);
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mat.checkerboard = Even;
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DerivInternal(StencilOdd, UmuEven, mat, U, V, dag);
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}
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template <class Impl>
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void WilsonFermion<Impl>::Dhop(const FermionField &in, FermionField &out, int dag) {
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conformable(in._grid, _grid); // verifies full grid
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conformable(in._grid, out._grid);
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out.checkerboard = in.checkerboard;
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DhopInternal(Stencil, Lebesgue, Umu, in, out, dag);
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}
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template <class Impl>
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void WilsonFermion<Impl>::DhopOE(const FermionField &in, FermionField &out, int dag) {
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conformable(in._grid, _cbgrid); // verifies half grid
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conformable(in._grid, out._grid); // drops the cb check
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assert(in.checkerboard == Even);
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out.checkerboard = Odd;
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DhopInternal(StencilEven, LebesgueEvenOdd, UmuOdd, in, out, dag);
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}
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template <class Impl>
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void WilsonFermion<Impl>::DhopEO(const FermionField &in, FermionField &out,int dag) {
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conformable(in._grid, _cbgrid); // verifies half grid
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conformable(in._grid, out._grid); // drops the cb check
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assert(in.checkerboard == Odd);
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out.checkerboard = Even;
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DhopInternal(StencilOdd, LebesgueEvenOdd, UmuEven, in, out, dag);
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}
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template <class Impl>
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void WilsonFermion<Impl>::Mdir(const FermionField &in, FermionField &out, int dir, int disp) {
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DhopDir(in, out, dir, disp);
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}
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template <class Impl>
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void WilsonFermion<Impl>::DhopDir(const FermionField &in, FermionField &out, int dir, int disp) {
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int skip = (disp == 1) ? 0 : 1;
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int dirdisp = dir + skip * 4;
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int gamma = dir + (1 - skip) * 4;
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DhopDirDisp(in, out, dirdisp, gamma, DaggerNo);
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};
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template <class Impl>
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void WilsonFermion<Impl>::DhopDirDisp(const FermionField &in, FermionField &out,int dirdisp, int gamma, int dag) {
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Compressor compressor(dag);
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Stencil.HaloExchange(in, compressor);
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parallel_for (int sss = 0; sss < in._grid->oSites(); sss++) {
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Kernels::DhopDir(Stencil, Umu, Stencil.CommBuf(), sss, sss, in, out, dirdisp, gamma);
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}
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};
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template <class Impl>
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void WilsonFermion<Impl>::DhopInternal(StencilImpl &st, LebesgueOrder &lo,
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DoubledGaugeField &U,
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const FermionField &in,
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FermionField &out, int dag) {
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assert((dag == DaggerNo) || (dag == DaggerYes));
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Compressor compressor(dag);
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st.HaloExchange(in, compressor);
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if (dag == DaggerYes) {
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parallel_for (int sss = 0; sss < in._grid->oSites(); sss++) {
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Kernels::DhopSiteDag(st, lo, U, st.CommBuf(), sss, sss, 1, 1, in, out);
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}
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} else {
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parallel_for (int sss = 0; sss < in._grid->oSites(); sss++) {
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Kernels::DhopSite(st, lo, U, st.CommBuf(), sss, sss, 1, 1, in, out);
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}
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}
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};
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FermOpTemplateInstantiate(WilsonFermion);
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AdjointFermOpTemplateInstantiate(WilsonFermion);
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TwoIndexFermOpTemplateInstantiate(WilsonFermion);
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GparityFermOpTemplateInstantiate(WilsonFermion);
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}
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}
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