PauliVillarsInverters.h

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    /*************************************************************************************
 
    Grid physics library, www.github.com/paboyle/Grid 
 
    Source file: ./lib/algorithms/iterative/SchurRedBlack.h
 
    Copyright (C) 2015
 
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 */
#pragma once
 
NAMESPACE_BEGIN(Grid);
 
template<class Field>
class PauliVillarsSolverUnprec
{
 public:
  ConjugateGradient<Field> & CG;
  PauliVillarsSolverUnprec(  ConjugateGradient<Field> &_CG) : CG(_CG){};
 
  template<class Matrix>
  void operator() (Matrix &_Matrix,const Field &src,Field &sol)
  {
    RealD m = _Matrix.Mass();
    Field A  (_Matrix.FermionGrid());
 
    MdagMLinearOperator<Matrix,Field> HermOp(_Matrix);
 
    _Matrix.SetMass(1.0);
    _Matrix.Mdag(src,A);
    CG(HermOp,A,sol);
    _Matrix.SetMass(m);
  };
};
 
template<class Field,class SchurSolverType>
class PauliVillarsSolverRBprec
{
 public:
  SchurSolverType & SchurSolver;
  PauliVillarsSolverRBprec( SchurSolverType &_SchurSolver) : SchurSolver(_SchurSolver){};
 
  template<class Matrix>
  void operator() (Matrix &_Matrix,const Field &src,Field &sol)
  {
    RealD m = _Matrix.Mass();
    Field A  (_Matrix.FermionGrid());
 
    _Matrix.SetMass(1.0);
    SchurSolver(_Matrix,src,sol);
    _Matrix.SetMass(m);
  };
};
 
template<class Field,class GaugeField>
class PauliVillarsSolverFourierAccel
{
 public:
  GaugeField      & Umu;
  ConjugateGradient<Field> & CG;
 
  PauliVillarsSolverFourierAccel(GaugeField &_Umu,ConjugateGradient<Field> &_CG) :  Umu(_Umu), CG(_CG)
  {
  };
 
  template<class Matrix>
  void operator() (Matrix &_Matrix,const Field &src,Field &sol)
  {
    FourierAcceleratedPV<Field, Matrix, typename Matrix::GaugeField > faPV(_Matrix,Umu,CG) ;
    faPV.pvInv(src,sol);
  };
};
 
NAMESPACE_END(Grid);