unprec_ovlap_contfrac5d_linop_array_w.h

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// -*- C++ -*-
/*! \file
 *  \brief Unpreconditioned extended-Overlap (5D) (Naryanan&Neuberger) linear operator
 */
 
#ifndef __unprec_ovlap_contfrac5d_linop_array_w_h__
#define __unprec_ovlap_contfrac5d_linop_array_w_h__
 
#include "linearop.h"
#include "unprec_wilstype_fermact_w.h" 
 
namespace Chroma 
{ 
  //! Unpreconditioned Extended-Overlap (N&N) linear operator
  /*!
   * \ingroup linop
   *
   * This operator applies the extended version of the hermitian overlap operator
   *   Chi  =   ((1+m_q)/(1-m_q)*gamma_5 + B) . Psi
   *  where  B  is the continued fraction of the pole approx. to eps(H(m))
   *
   * This operator implements  hep-lat/0005004
   */
 
  class UnprecOvlapContFrac5DLinOpArray : public UnprecLinearOperatorArray<LatticeFermion, 
                                          multi1d<LatticeColorMatrix>, multi1d<LatticeColorMatrix> >
  {
  public:
    // Typedefs to save typing
    typedef LatticeFermion               T;
    typedef multi1d<LatticeColorMatrix>  P;
    typedef multi1d<LatticeColorMatrix>  Q;
 
    //! Full constructor
    UnprecOvlapContFrac5DLinOpArray(const UnprecWilsonTypeFermAct<T,P,Q>& S_aux,
                                    Handle< FermState<T,P,Q> > state,
                                    const Real& _m_q,
                                    int _N5,
                                    const Real& _scale_fac,
                                    const multi1d<Real>& _alpha,
                                    const multi1d<Real>& _beta,
                                    int _NEig,
                                    const multi1d<Real>& _EigValFunc,
                                    const multi1d<LatticeFermion>& _EigVec,
                                    const bool _isLastZeroP ) :
      M(S_aux.linOp(state)), fbc(state->getFermBC()), 
      m_q(_m_q), N5(_N5), scale_fac(_scale_fac), alpha(_alpha),
      beta(_beta), NEig(_NEig), EigVec(_EigVec), EigValFunc(_EigValFunc),
      isLastZeroP(_isLastZeroP) 
    {
      QDPIO::cout << "LinOp isLastZeroP = " << isLastZeroP << std::endl;
    }
 
    //! Length of DW flavor index/space
    int size() const {return N5;}
 
    //! Destructor is automatic
    ~UnprecOvlapContFrac5DLinOpArray() {}
 
    //! Only defined on the entire lattice
    const Subset& subset() const {return all;}
 
    //! Return the fermion BC object for this linear operator
    const FermBC<T,P,Q>& getFermBC() const {return *fbc;}
 
    //! Apply the operator onto a source std::vector
    void operator() (multi1d<LatticeFermion>& chi, 
                     const multi1d<LatticeFermion>& psi, 
                     enum PlusMinus isign) const;
 
    //! Derivative
    void deriv(multi1d<LatticeColorMatrix>& ds_u, 
               const multi1d<LatticeFermion>& chi, const multi1d<LatticeFermion>& psi, 
               enum PlusMinus isign) const;
 
  private:
    Handle< DiffLinearOperator<T,P,Q> > M;  // Wilson(esque) Op
    Handle< FermBC<T,P,Q> > fbc;
    const Real m_q;
    const int  N5;    // Size of the 5th dimension
    const Real scale_fac;
    const multi1d<Real> alpha;
    const multi1d<Real> beta;
    const int NEig;
    const multi1d<LatticeFermion> EigVec;
    const multi1d<Real> EigValFunc;
    const bool isLastZeroP;
 
 
  };
 
} // End Namespace Chroma
 
 
#endif