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101 lines
4.5 KiB
C
101 lines
4.5 KiB
C
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/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/qcd/action/fermion/AbstractEOFAFermion.h
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Copyright (C) 2017
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Author: Peter Boyle <pabobyle@ph.ed.ac.uk>
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Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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Author: David Murphy <dmurphy@phys.columbia.edu>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution directory
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*************************************************************************************/
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/* END LEGAL */
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#ifndef GRID_QCD_ABSTRACT_EOFA_FERMION_H
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#define GRID_QCD_ABSTRACT_EOFA_FERMION_H
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#include <Grid/qcd/action/fermion/CayleyFermion5D.h>
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namespace Grid {
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namespace QCD {
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// DJM: Abstract base class for EOFA fermion types.
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// Defines layout of additional EOFA-specific parameters and operators.
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// Use to construct EOFA pseudofermion actions that are agnostic to Shamir / Mobius / etc.,
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// and ensure that no one can construct EOFA pseudofermion action with non-EOFA fermion type.
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template<class Impl>
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class AbstractEOFAFermion : public CayleyFermion5D<Impl> {
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public:
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INHERIT_IMPL_TYPES(Impl);
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public:
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// Fermion operator: D(mq1) + shift*\gamma_{5}*R_{5}*\Delta_{\pm}(mq2,mq3)*P_{\pm}
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RealD mq1;
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RealD mq2;
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RealD mq3;
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RealD shift;
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int pm;
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RealD alpha; // Mobius scale
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RealD k; // EOFA normalization constant
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virtual void Instantiatable(void) = 0;
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// EOFA-specific operations
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// Force user to implement in derived classes
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virtual void Omega (const FermionField& in, FermionField& out, int sign, int dag) = 0;
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virtual void Dtilde (const FermionField& in, FermionField& out) = 0;
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virtual void DtildeInv(const FermionField& in, FermionField& out) = 0;
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// Implement derivatives in base clcass: for EOFA both DWF and Mobius just need d(Dw)/dU
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virtual void MDeriv(GaugeField& mat, const FermionField& U, const FermionField& V, int dag){
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this->DhopDeriv(mat, U, V, dag);
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};
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virtual void MoeDeriv(GaugeField& mat, const FermionField& U, const FermionField& V, int dag){
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this->DhopDerivOE(mat, U, V, dag);
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};
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virtual void MeoDeriv(GaugeField& mat, const FermionField& U, const FermionField& V, int dag){
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this->DhopDerivEO(mat, U, V, dag);
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};
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// Recompute 5D coefficients for different value of shift constant (needed for heatbath loop over poles)
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virtual void RefreshShiftCoefficients(RealD new_shift) = 0;
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// Constructors
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AbstractEOFAFermion(GaugeField& _Umu,
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GridCartesian& FiveDimGrid,
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GridRedBlackCartesian& FiveDimRedBlackGrid,
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GridCartesian& FourDimGrid,
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GridRedBlackCartesian& FourDimRedBlackGrid,
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RealD _mq1, RealD _mq2, RealD _mq3, RealD _shift, int _pm,
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RealD _M5, RealD _b, RealD _c, const ImplParams &p= ImplParams()) :
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CayleyFermion5D<Impl>(_Umu, FiveDimGrid, FiveDimRedBlackGrid, FourDimGrid, FourDimRedBlackGrid, _mq1, _M5, p),
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mq1(_mq1), mq2(_mq2), mq3(_mq3), shift(_shift), pm(_pm)
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{
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int Ls = this->Ls;
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this->alpha = _b + _c;
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this->k = this->alpha * (_mq3 - _mq2) * std::pow(this->alpha+1.0,2*Ls) /
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( std::pow(alpha+1.0,Ls) + _mq2*std::pow(alpha-1.0,Ls) ) /
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( std::pow(alpha+1.0,Ls) + _mq3*std::pow(alpha-1.0,Ls) );
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}
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};
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}}
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#endif
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