MobiusFermion.h

Go to the documentation of this file.

/*************************************************************************************
 
    Grid physics library, www.github.com/paboyle/Grid 
 
    Source file: ./lib/qcd/action/fermion/MobiusFermion.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  GRID_QCD_MOBIUS_FERMION_H
#define  GRID_QCD_MOBIUS_FERMION_H
 
#include <Grid/qcd/action/fermion/FermionCore.h>
 
NAMESPACE_BEGIN(Grid);
 
template<class Impl>
class MobiusFermion : public CayleyFermion5D<Impl>
{
public:
  INHERIT_IMPL_TYPES(Impl);
public:
 
  virtual void   Instantiatable(void) {};
  // Constructors
  MobiusFermion(GaugeField &_Umu,
        GridCartesian         &FiveDimGrid,
        GridRedBlackCartesian &FiveDimRedBlackGrid,
        GridCartesian         &FourDimGrid,
        GridRedBlackCartesian &FourDimRedBlackGrid,
        RealD _mass,RealD _M5,
        RealD b, RealD c,const ImplParams &p= ImplParams()) : 
      
    CayleyFermion5D<Impl>(_Umu,
              FiveDimGrid,
              FiveDimRedBlackGrid,
              FourDimGrid,
              FourDimRedBlackGrid,_mass,_M5,p)
 
  {
    RealD eps = 1.0;
 
    //    std::cout<<GridLogMessage << "MobiusFermion (b="<<b<<",c="<<c<<") with Ls= "<<this->Ls<<" Tanh approx"<<std::endl;
    Approx::zolotarev_data *zdata = Approx::higham(eps,this->Ls);// eps is ignored for higham
    assert(zdata->n==this->Ls);
    
    // Call base setter
    this->SetCoefficientsTanh(zdata,b,c);
 
    Approx::zolotarev_free(zdata);
 
  }
 
};
 
NAMESPACE_END(Grid);
 
#endif