OverlapWilsonContfracZolotarevFermion.h

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/*************************************************************************************
 
    Grid physics library, www.github.com/paboyle/Grid 
 
    Source file: ./lib/qcd/action/fermion/OverlapWilsonContfracZolotarevFermion.h
 
    Copyright (C) 2015
 
Author: Peter Boyle <pabobyle@ph.ed.ac.uk>
Author: Peter Boyle <paboyle@ph.ed.ac.uk>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
    See the full license in the file "LICENSE" in the top level distribution directory
*************************************************************************************/
/*  END LEGAL */
#ifndef OVERLAP_WILSON_CONTFRAC_ZOLOTAREV_FERMION_H
#define OVERLAP_WILSON_CONTFRAC_ZOLOTAREV_FERMION_H
 
#include <Grid/qcd/action/fermion/FermionCore.h>
 
NAMESPACE_BEGIN(Grid);
 
template<class Impl>
class OverlapWilsonContFracZolotarevFermion : public ContinuedFractionFermion5D<Impl>
{
public:
  INHERIT_IMPL_TYPES(Impl);
 
  virtual void   Instantiatable(void){};
  void  MomentumSpacePropagator(FermionField &out,const FermionField &in,RealD _m,std::vector<double> twist) {
    this->MomentumSpacePropagatorHw(out,in,_m,twist);
  };
  // Constructors
  OverlapWilsonContFracZolotarevFermion(GaugeField &_Umu,
                    GridCartesian         &FiveDimGrid,
                    GridRedBlackCartesian &FiveDimRedBlackGrid,
                    GridCartesian         &FourDimGrid,
                    GridRedBlackCartesian &FourDimRedBlackGrid,
                    RealD _mass,RealD _M5,
                    RealD lo,RealD hi,const ImplParams &p= ImplParams()):
      
    // b+c=scale, b-c = 0 <=> b =c = scale/2
    ContinuedFractionFermion5D<Impl>(_Umu,
                     FiveDimGrid,
                     FiveDimRedBlackGrid,
                     FourDimGrid,
                     FourDimRedBlackGrid,_mass,_M5,p)
  {
    assert((this->Ls&0x1)==1); // Odd Ls required
 
    int nrational=this->Ls;// Odd rational order
    RealD eps = lo/hi;
 
    Approx::zolotarev_data *zdata = Approx::zolotarev(eps,nrational,0);
    this->SetCoefficientsZolotarev(hi,zdata);
    Approx::zolotarev_free(zdata);
 
  }
};
 
NAMESPACE_END(Grid);
#endif