unprec_ovext_linop_array_w.h

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// -*- C++ -*-
/*! \file
 *  \brief Unpreconditioned extended-Overlap (5D) (Naryanan&Neuberger) linear operator
 */
 
#ifndef __unprec_ovext_linop_array_w_h__
#define __unprec_ovext_linop_array_w_h__
 
#include "chromabase.h"
#include "handle.h"
#include "linearop.h"
#include "actions/ferm/linop/unprec_wilson_linop_w.h"
 
using namespace QDP;
 
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 UnprecOvExtLinOpArray : 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
    UnprecOvExtLinOpArray(Handle< FermState<T,P,Q> > fs,
                          const int Npoles_,
                          const Real& coeffP_,
                          const multi1d<Real>& resP_,
                          const multi1d<Real>& rootQ_,
                          const multi1d<Real>& beta_,
                          const Real& OverMass_,
                          const Real& Mass_,
                          const Real& b5_,
                          const Real& c5_)
 
    {create(fs,Npoles_, coeffP_, resP_, rootQ_, beta_, 
            OverMass_,Mass_,b5_,c5_);}
 
    //! Creation routine
    void create(Handle< FermState<T,P,Q> > fs,
                const int Npoles_,
                const Real& coeffP_,
                const multi1d<Real>& resP_,
                const multi1d<Real>& rootQ_,
                const multi1d<Real>& beta_,
                const Real& OverMass_,
                const Real& m_q_,
                const Real& b5_,
                const Real& c5_);
 
    //! Length of DW flavor index/space
    int size() const {return N5;}
 
    //! Destructor is automatic
    ~UnprecOvExtLinOpArray() {}
 
    //! Only defined on the entire lattice
    const Subset& subset() const {return all;}
 
    //! 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;
 
    //! Return the fermion BC object for this linear operator
    const FermBC<T,P,Q>& getFermBC() const {return *fbc;}
 
  protected:
    //! Partial constructor
    UnprecOvExtLinOpArray() {}
    //! Hide =
    void operator=(const UnprecOvExtLinOpArray&) {}
 
  private:
    UnprecWilsonLinOp  Dw;
    Handle< FermBC<T,P,Q> > fbc;
    int Npoles;
    int N5;
    Real R;
    Real alpha;
    Real a5;
    Real coeffP;
    multi1d<Real> p_by_beta_sqrt;
    multi1d<Real> q_sqrt;
    multi1d<Real> beta;
  };
 
} // End Namespace Chroma
 
 
#endif