mirror of
https://github.com/paboyle/Grid.git
synced 2024-11-14 01:35:36 +00:00
1b3c93e22a
Allows multi-precision work and paves the way for alternate BC's and such like allowing for example G-parity which is important for K pipi programme. In particular, can drive an extra flavour index into the fermion fields using template types.
127 lines
3.9 KiB
C++
127 lines
3.9 KiB
C++
#include <Grid.h>
|
|
|
|
using namespace std;
|
|
using namespace Grid;
|
|
using namespace Grid::QCD;
|
|
|
|
#define parallel_for PARALLEL_FOR_LOOP for
|
|
|
|
int main (int argc, char ** argv)
|
|
{
|
|
Grid_init(&argc,&argv);
|
|
|
|
std::vector<int> latt_size = GridDefaultLatt();
|
|
std::vector<int> simd_layout = GridDefaultSimd(Nd,vComplex::Nsimd());
|
|
std::vector<int> mpi_layout = GridDefaultMpi();
|
|
|
|
const int Ls=9;
|
|
|
|
GridCartesian * UGrid = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(), GridDefaultSimd(Nd,vComplex::Nsimd()),GridDefaultMpi());
|
|
GridRedBlackCartesian * UrbGrid = SpaceTimeGrid::makeFourDimRedBlackGrid(UGrid);
|
|
GridCartesian * FGrid = SpaceTimeGrid::makeFiveDimGrid(Ls,UGrid);
|
|
GridRedBlackCartesian * FrbGrid = SpaceTimeGrid::makeFiveDimRedBlackGrid(Ls,UGrid);
|
|
|
|
std::vector<int> seeds4({1,2,3,4});
|
|
std::vector<int> seeds5({5,6,7,8});
|
|
GridParallelRNG RNG5(FGrid); RNG5.SeedFixedIntegers(seeds5);
|
|
GridParallelRNG RNG4(UGrid); RNG4.SeedFixedIntegers(seeds4);
|
|
|
|
int threads = GridThread::GetThreads();
|
|
std::cout<<GridLogMessage << "Grid is setup to use "<<threads<<" threads"<<std::endl;
|
|
|
|
LatticeFermion phi (FGrid); gaussian(RNG5,phi);
|
|
LatticeFermion Mphi (FGrid);
|
|
LatticeFermion MphiPrime (FGrid);
|
|
|
|
LatticeGaugeField U(UGrid);
|
|
|
|
SU3::HotConfiguration(RNG4,U);
|
|
|
|
////////////////////////////////////
|
|
// Unmodified matrix element
|
|
////////////////////////////////////
|
|
RealD mass=0.01;
|
|
RealD M5=1.8;
|
|
OverlapWilsonPartialFractionTanhFermionR Dpf(U,*FGrid,*FrbGrid,*UGrid,*UrbGrid,mass,M5,1.0);
|
|
Dpf.M (phi,Mphi);
|
|
|
|
ComplexD S = innerProduct(Mphi,Mphi); // pdag MdagM p
|
|
|
|
// get the deriv of phidag MdagM phi with respect to "U"
|
|
LatticeGaugeField UdSdU(UGrid);
|
|
LatticeGaugeField tmp(UGrid);
|
|
|
|
|
|
Dpf.MDeriv(tmp , Mphi, phi,DaggerNo ); UdSdU=tmp;
|
|
Dpf.MDeriv(tmp , phi, Mphi,DaggerYes ); UdSdU=(UdSdU+tmp);
|
|
|
|
LatticeFermion Ftmp (FGrid);
|
|
|
|
////////////////////////////////////
|
|
// Modify the gauge field a little
|
|
////////////////////////////////////
|
|
RealD dt = 0.0001;
|
|
|
|
LatticeColourMatrix mommu(UGrid);
|
|
LatticeColourMatrix forcemu(UGrid);
|
|
LatticeGaugeField mom(UGrid);
|
|
LatticeGaugeField Uprime(UGrid);
|
|
|
|
for(int mu=0;mu<Nd;mu++){
|
|
|
|
SU3::GaussianLieAlgebraMatrix(RNG4, mommu); // Traceless antihermitian momentum; gaussian in lie alg
|
|
|
|
PokeIndex<LorentzIndex>(mom,mommu,mu);
|
|
|
|
// fourth order exponential approx
|
|
parallel_for(auto i=mom.begin();i<mom.end();i++){
|
|
Uprime[i](mu) =
|
|
U[i](mu)
|
|
+ mom[i](mu)*U[i](mu)*dt
|
|
+ mom[i](mu) *mom[i](mu) *U[i](mu)*(dt*dt/2.0)
|
|
+ mom[i](mu) *mom[i](mu) *mom[i](mu) *U[i](mu)*(dt*dt*dt/6.0)
|
|
+ mom[i](mu) *mom[i](mu) *mom[i](mu) *mom[i](mu) *U[i](mu)*(dt*dt*dt*dt/24.0)
|
|
+ mom[i](mu) *mom[i](mu) *mom[i](mu) *mom[i](mu) *mom[i](mu) *U[i](mu)*(dt*dt*dt*dt*dt/120.0)
|
|
+ mom[i](mu) *mom[i](mu) *mom[i](mu) *mom[i](mu) *mom[i](mu) *mom[i](mu) *U[i](mu)*(dt*dt*dt*dt*dt*dt/720.0)
|
|
;
|
|
}
|
|
|
|
}
|
|
|
|
Dpf.ImportGauge(Uprime);
|
|
Dpf.M (phi,MphiPrime);
|
|
|
|
ComplexD Sprime = innerProduct(MphiPrime ,MphiPrime);
|
|
|
|
//////////////////////////////////////////////
|
|
// Use derivative to estimate dS
|
|
//////////////////////////////////////////////
|
|
|
|
|
|
LatticeComplex dS(UGrid); dS = zero;
|
|
for(int mu=0;mu<Nd;mu++){
|
|
mommu = PeekIndex<LorentzIndex>(UdSdU,mu);
|
|
mommu=Ta(mommu)*2.0;
|
|
PokeIndex<LorentzIndex>(UdSdU,mommu,mu);
|
|
}
|
|
|
|
for(int mu=0;mu<Nd;mu++){
|
|
forcemu = PeekIndex<LorentzIndex>(UdSdU,mu);
|
|
mommu = PeekIndex<LorentzIndex>(mom,mu);
|
|
|
|
// Update PF action density
|
|
dS = dS+trace(mommu*forcemu)*dt;
|
|
|
|
}
|
|
|
|
Complex dSpred = sum(dS);
|
|
|
|
std::cout << GridLogMessage << " S "<<S<<std::endl;
|
|
std::cout << GridLogMessage << " Sprime "<<Sprime<<std::endl;
|
|
std::cout << GridLogMessage << "dS "<<Sprime-S<<std::endl;
|
|
std::cout << GridLogMessage << "predict dS "<< dSpred <<std::endl;
|
|
|
|
std::cout<< GridLogMessage << "Done" <<std::endl;
|
|
Grid_finalize();
|
|
}
|