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5a80930dd2
class, changing the nature of covariant Cshifts used in plaquettes, rectangles and staples. As a result same code is used for the plaq and rect action independent of the BC type. Should probably isolate the BC in a separate class that Gimpl takes as a template param. Do the same with smearing policies. This would then allow composition of BC with smearing etc....
103 lines
3.2 KiB
C++
103 lines
3.2 KiB
C++
#ifndef QCD_UTILS_COVARIANT_CSHIFT_H
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#define QCD_UTILS_COVARIANT_CSHIFT_H
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namespace Grid {
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namespace QCD {
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////////////////////////////////////////////////////////////////////////
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// Low performance implementation of CovariantCshift API
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////////////////////////////////////////////////////////////////////////
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// Make these members of an Impl class for BC's.
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namespace PeriodicBC {
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template<class covariant,class gauge> Lattice<covariant> CovShiftForward(const Lattice<gauge> &Link,
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int mu,
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const Lattice<covariant> &field)
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{
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return Link*Cshift(field,mu,1);// moves towards negative mu
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}
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template<class covariant,class gauge> Lattice<covariant> CovShiftBackward(const Lattice<gauge> &Link,
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int mu,
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const Lattice<covariant> &field)
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{
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Lattice<covariant> tmp(field._grid);
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tmp = adj(Link)*field;
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return Cshift(tmp,mu,-1);// moves towards positive mu
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}
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}
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namespace GparityBC {
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// Must give right answers across boundary
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// <----
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// --
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// | |
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// xxxxxxxxxxxxxxxxxxxx
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// | |
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//
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// Stap= Cshift(GImpl::CovShiftForward(U[nu],nu,
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// GImpl::CovShiftForward(U[nu],nu,
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// GImpl::CovShiftBackward(U[mu],mu,
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// GImpl::CovShiftBackward(U[nu],nu,
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// GImpl::CovShiftIdentityBackward(U[nu],nu,-1))))) , mu, 1);
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//
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// U U^* U^* U^T U^adj = U (U U U^dag U^T )^*
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// = U (U U U^dag)^* ( U^T )^*
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//
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// So covariant shift rule: conjugate inward shifted plane when crossing boundary applies.
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//
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// This conjugate should be applied to BOTH the link and the covariant field on backward shift
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// boundary wrap.
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//
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// | |
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// xxxxxxxxxxxxxxxxx
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// | | <---- this link is conjugated, and the path leading into it. Segment crossing in and out is double conjugated.
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// --
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// ------->
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template<class covariant,class gauge> Lattice<covariant> CovShiftForward(const Lattice<gauge> &Link,
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int mu,
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const Lattice<covariant> &field)
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{
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GridBase * grid = Link._grid;
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int Lmu = grid->GlobalDimensions()[mu]-1;
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conformable(field,Link);
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Lattice<iScalar<vInteger> > coor(grid); LatticeCoordinate(coor,mu);
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Lattice<covariant> field_bc = Cshift(field,mu,1);// moves towards negative mu;
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field_bc = where(coor==Lmu,conjugate(field_bc),field_bc);
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// std::cout<<"Gparity::CovCshiftForward mu="<<mu<<std::endl;
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return Link*field_bc;
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}
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template<class covariant,class gauge> Lattice<covariant> CovShiftBackward(const Lattice<gauge> &Link,
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int mu,
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const Lattice<covariant> &field)
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{
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GridBase * grid = field._grid;
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int Lmu = grid->GlobalDimensions()[mu]-1;
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conformable(field,Link);
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Lattice<iScalar<vInteger> > coor(grid); LatticeCoordinate(coor,mu);
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Lattice<covariant> tmp(grid);
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tmp = adj(Link)*field;
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tmp = where(coor==Lmu,conjugate(tmp),tmp);
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// std::cout<<"Gparity::CovCshiftBackward mu="<<mu<<std::endl;
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return Cshift(tmp,mu,-1);// moves towards positive mu
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}
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}
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}}
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#endif
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