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140 lines
4.9 KiB
C++
140 lines
4.9 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/qcd/action/fermion/DomainWallFermion.h
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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: Vera Guelpers <V.M.Guelpers@soton.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 directory
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*************************************************************************************/
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/* END LEGAL */
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#ifndef GRID_QCD_DOMAIN_WALL_FERMION_H
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#define GRID_QCD_DOMAIN_WALL_FERMION_H
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#include <Grid/qcd/action/fermion/FermionCore.h>
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NAMESPACE_BEGIN(Grid);
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template<class Impl>
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class DomainWallFermion : public CayleyFermion5D<Impl>
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{
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public:
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INHERIT_IMPL_TYPES(Impl);
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public:
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void FreePropagator(const FermionField &in,FermionField &out,RealD mass,std::vector<Complex> boundary, std::vector<double> twist, bool fiveD) {
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FermionField in_k(in.Grid());
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FermionField prop_k(in.Grid());
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FFT theFFT((GridCartesian *) in.Grid());
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//phase for boundary condition
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ComplexField coor(in.Grid());
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ComplexField ph(in.Grid()); ph = Zero();
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FermionField in_buf(in.Grid()); in_buf = Zero();
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typedef typename Simd::scalar_type Scalar;
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Scalar ci(0.0,1.0);
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assert(twist.size() == Nd);//check that twist is Nd
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assert(boundary.size() == Nd);//check that boundary conditions is Nd
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int shift = 0;
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if(fiveD) shift = 1;
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for(unsigned int nu = 0; nu < Nd; nu++)
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{
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// Shift coordinate lattice index by 1 to account for 5th dimension.
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LatticeCoordinate(coor, nu + shift);
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double boundary_phase = ::acos(real(boundary[nu]));
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ph = ph + boundary_phase*coor*((1./(in.Grid()->_fdimensions[nu+shift])));
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//momenta for propagator shifted by twist+boundary
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twist[nu] = twist[nu] + boundary_phase/((2.0*M_PI));
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}
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in_buf = exp(ci*ph*(-1.0))*in;
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if(fiveD){//FFT only on temporal and spatial dimensions
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std::vector<int> mask(Nd+1,1); mask[0] = 0;
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theFFT.FFT_dim_mask(in_k,in_buf,mask,FFT::forward);
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this->MomentumSpacePropagatorHt_5d(prop_k,in_k,mass,twist);
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theFFT.FFT_dim_mask(out,prop_k,mask,FFT::backward);
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}
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else{
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theFFT.FFT_all_dim(in_k,in,FFT::forward);
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this->MomentumSpacePropagatorHt(prop_k,in_k,mass,twist);
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theFFT.FFT_all_dim(out,prop_k,FFT::backward);
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}
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//phase for boundary condition
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out = out * exp(ci*ph);
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};
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virtual void FreePropagator(const FermionField &in,FermionField &out,RealD mass,std::vector<Complex> boundary,std::vector<double> twist) {
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bool fiveD = true; //5d propagator by default
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FreePropagator(in,out,mass,boundary,twist,fiveD);
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};
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virtual void FreePropagator(const FermionField &in,FermionField &out,RealD mass, bool fiveD) {
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std::vector<double> twist(Nd,0.0); //default: periodic boundarys in all directions
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std::vector<Complex> boundary;
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for(int i=0;i<Nd;i++) boundary.push_back(1);//default: periodic boundary conditions
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FreePropagator(in,out,mass,boundary,twist,fiveD);
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};
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virtual void FreePropagator(const FermionField &in,FermionField &out,RealD mass) {
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bool fiveD = true; //5d propagator by default
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std::vector<double> twist(Nd,0.0); //default: twist angle 0
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std::vector<Complex> boundary;
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for(int i=0;i<Nd;i++) boundary.push_back(1); //default: periodic boundary conditions
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FreePropagator(in,out,mass,boundary,twist,fiveD);
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};
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virtual void Instantiatable(void) {};
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// Constructors
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DomainWallFermion(GaugeField &_Umu,
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GridCartesian &FiveDimGrid,
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GridRedBlackCartesian &FiveDimRedBlackGrid,
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GridCartesian &FourDimGrid,
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GridRedBlackCartesian &FourDimRedBlackGrid,
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RealD _mass,RealD _M5,const ImplParams &p= ImplParams()) :
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CayleyFermion5D<Impl>(_Umu,
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FiveDimGrid,
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FiveDimRedBlackGrid,
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FourDimGrid,
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FourDimRedBlackGrid,_mass,_M5,p)
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{
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RealD eps = 1.0;
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Approx::zolotarev_data *zdata = Approx::higham(eps,this->Ls);// eps is ignored for higham
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assert(zdata->n==this->Ls);
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// std::cout<<GridLogMessage << "DomainWallFermion with Ls="<<this->Ls<<std::endl;
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// Call base setter
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this->SetCoefficientsTanh(zdata,1.0,0.0);
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Approx::zolotarev_free(zdata);
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}
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};
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NAMESPACE_END(Grid);
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#endif
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