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add option mom to MSource::Gauss

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This commit is contained in:
Nils Asmussen 2019-05-23 17:33:32 +01:00
parent e553678599
commit e43d59045e
1 changed files with 25 additions and 7 deletions
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30
Hadrons/Modules/MSource/Gauss.hpp
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@ -9,7 +9,8 @@ BEGIN_HADRONS_NAMESPACE
/******************************************************************************
* Gauss *
* result[n] = 1/(sqrt(2*pi)*width)^dim*exp(-|n|^2/(2*width^2)) *
* result[n] = 1/(sqrt(2*pi)*width)^dim *
* * exp(-|n-position|^2/(2*width^2) + i n.mom) *
* where: *
* n=(n[0],n[1],...,n[dim-1]) (lattice coordinate) *
* dim=Nd-1 *
@ -21,6 +22,7 @@ class GaussPar: Serializable
public:
GRID_SERIALIZABLE_CLASS_MEMBERS(GaussPar,
std::string, position,
std::string, mom,
double, width);
};
@ -41,6 +43,7 @@ public:
virtual void execute(void);
private:
std::vector<int> position_;
std::vector<int> mom_;
};
MODULE_REGISTER_TMP(Gauss, TGauss<FIMPL>, MSource);
@ -75,7 +78,21 @@ std::vector<std::string> TGauss<FImpl>::getOutput(void)
template <typename FImpl>
void TGauss<FImpl>::setup(void)
{
auto parse_vector = [](const std::string &momentum, int dim,
const std::string &desc)
{
std::vector<int> res = strToVec<int>(momentum);
if(res.size() != dim) {
HADRONS_ERROR(Size, desc + " has " + std::to_string(res.size())
+ " instead of " + std::to_string(dim) + " components");
}
return res;
};
position_ = parse_vector(par().position, env().getNd()-1, "position");
mom_ = parse_vector(par().mom, env().getNd()-1, "momentum");
envCreateLat(LatticeComplex, getName());
envTmpLat(LatticeComplex, "component");
}
// execution ///////////////////////////////////////////////////////////////////
@ -86,17 +103,18 @@ void TGauss<FImpl>::execute(void)
envGetTmp(LatticeComplex, component);
const int dim=env().getNd()-1;
const double fact=-0.5/std::pow(par().width,2);
const std::vector<int> latt_size { env().getGrid()->FullDimensions() };
Complex i(0.0, 1.0);
//exp(fact*|n|^2)
//exp(fact*|n|^2 +i n.mom)
rho=zero;
for(int mu=0; mu<dim; mu++) {
LatticeCoordinate(component, mu);
rho+=(i*(static_cast<double>(mom_[mu])/env().getDim(mu)))*component;
//FIXME: the next three lines are very inefficient...
// should not need any communication (Cshift) here
assert(latt_size[mu]%2==0);
component-=Complex(latt_size[mu]/2-1);
component=Cshift(component, mu, latt_size[mu]/2-1 -position_[mu]);
assert(env().getDim(mu)%2==0);
component-=Complex(env().getDim(mu)/2-1);
component=Cshift(component, mu, env().getDim(mu)/2-1 -position_[mu]);
rho+=component*component*fact;
}
rho=exp(rho);