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Peter Boyle 2020-11-19 19:24:14 +01:00
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tests/core/Test_reunitarise.cc Normal file
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/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./tests/Test_quenched_update.cc
Copyright (C) 2015
Author: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>
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 */
#include <Grid/Grid.h>
using namespace std;
using namespace Grid;
;
int main (int argc, char ** argv)
{
Grid_init(&argc,&argv);
std::vector<int> latt({8,8,8,8});
GridCartesian * grid = SpaceTimeGrid::makeFourDimGrid(latt,
GridDefaultSimd(Nd,vComplexD::Nsimd()),
GridDefaultMpi());
GridCartesian * gridF = SpaceTimeGrid::makeFourDimGrid(latt,
GridDefaultSimd(Nd,vComplexF::Nsimd()),
GridDefaultMpi());
///////////////////////////////
// Configuration of known size
///////////////////////////////
LatticeColourMatrixD ident(grid);
LatticeColourMatrixD U(grid);
LatticeColourMatrixD UU(grid);
LatticeColourMatrixD tmp(grid);
LatticeColourMatrixD org(grid);
LatticeColourMatrixF UF(gridF);
LatticeGaugeField Umu(grid);
ident =1.0;
// RNG set up for test
std::vector<int> pseeds({1,2,3,4,5}); // once I caught a fish alive
std::vector<int> sseeds({6,7,8,9,10});// then i let it go again
GridParallelRNG pRNG(grid); pRNG.SeedFixedIntegers(pseeds);
GridSerialRNG sRNG; sRNG.SeedFixedIntegers(sseeds);
SU<Nc>::HotConfiguration(pRNG,Umu);
U = PeekIndex<LorentzIndex>(Umu,0);
org=U;
tmp= U*adj(U) - ident ;
RealD Def1 = norm2( tmp );
std::cout << " Defect1 "<<Def1<<std::endl;
tmp = U - org;
std::cout << "Diff1 "<<norm2(tmp)<<std::endl;
precisionChange(UF,U);
precisionChange(U,UF);
tmp= U*adj(U) - ident ;
RealD Def2 = norm2( tmp );
std::cout << " Defect2 "<<Def2<<std::endl;
tmp = U - org;
std::cout << "Diff2 "<<norm2(tmp)<<std::endl;
U = ProjectOnGroup(U);
tmp= U*adj(U) - ident ;
RealD Def3 = norm2( tmp);
std::cout << " Defect3 "<<Def3<<std::endl;
tmp = U - org;
std::cout << "Diff3 "<<norm2(tmp)<<std::endl;
LatticeComplexD detU(grid);
LatticeComplexD detUU(grid);
detU= Determinant(U) ;
std::cout << "Determinant before screw up " <<detU<<std::endl;
std::cout << " Screwing up determinant " << std::endl;
RealD theta = 0.2;
ComplexD phase(cos(theta),sin(theta));
for(int i=0;i<Nc;i++){
auto element = PeekIndex<ColourIndex>(U,Nc-1,i);
element = element * phase;
PokeIndex<ColourIndex>(U,element,Nc-1,i);
}
UU=U;
detU= Determinant(U) ;
std::cout << "Determinant after screw up " <<detU<<std::endl;
ProjectSU3(U);
detU= Determinant(U) ;
std::cout << "Determinant ProjectSU3 " <<detU<<std::endl;
detU= detU -1.0;
std::cout << "Determinant ProjectSU3 defect " <<norm2(detU)<<std::endl;
ProjectSUn<3>(UU);
detUU= Determinant(UU);
std::cout << "Determinant ProjectSUn " <<detUU<<std::endl;
std::cout << "Determinant ProjectSUn defect " <<norm2(detUU)<<std::endl;
Grid_finalize();
}