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Adding WilsonFlow smearing

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This commit is contained in:
Guido Cossu 2017-03-21 11:52:05 +09:00
parent 3d0fe15374
commit 18b7845b7b
3 changed files with 179 additions and 6 deletions
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28
lib/qcd/smearing/APEsmearing.h
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@ -1,3 +1,31 @@
/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./lib/qcd/modules/plaquette.h
Copyright (C) 2017
Author: Guido Cossu <guido.cossu@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 */
/*!
@brief Declaration of Smear_APE class for APE smearing
*/

28
lib/qcd/smearing/BaseSmearing.h
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@ -1,3 +1,31 @@
/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./lib/qcd/modules/plaquette.h
Copyright (C) 2017
Author: Guido Cossu <guido.cossu@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 */
/*
@brief Declares base smearing class Smear
*/

117
lib/qcd/smearing/WilsonFlow.h Normal file
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@ -0,0 +1,117 @@
/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./lib/qcd/modules/plaquette.h
Copyright (C) 2017
Author: Guido Cossu <guido.cossu@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 */
#ifndef WILSONFLOW_H
#define WILSONFLOW_H
namespace Grid {
namespace QCD {
template <class Gimpl>
class WilsonFlow: public Smear<Gimpl>{
unsigned int Nstep;
RealD epsilon;
WilsonGaugeAction &SG;
void evolve_step();
RealD tau(unsigned int t)const {return epsilon*(t+1.0); }
public:
INHERIT_GIMPL_TYPES(Gimpl)
explicit WilsonFlow(unsigned int Nstep, RealD epsilon):
Nstep(Nstep),
epsilon(epsilon),
SG(3.0) {
// WilsonGaugeAction with beta 3.0
assert(epsilon > 0.0);
LogMessage();
}
void LogMessage() {
std::cout << GridLogMessage
<< "[WilsonFlow] Nstep : " << Nstep
<< "[WilsonFlow] epsilon : " << epsilon
<< "[WilsonFlow] full trajectory : " << Nstep * epsilon
<< std::endl;
}
virtual void smear(GaugeField&, const GaugeField&) const;
virtual void derivative(GaugeField&, const GaugeField&, const GaugeField&) const {
assert(0);
// undefined for WilsonFlow
}
RealD energyDensityPlaquette(unsigned int step, const GaugeField& U) const;
};
void WilsonFlow::evolve_step(GaugeField &U) {
GaugeField Z(U._grid);
GaugeField tmp(U._grid);
SG.deriv(U, Z);
Z *= 0.25; // Z0 = 1/4 * F(U)
Gimpl::update_field(Z, U, -2.0*epsilon); // U = W1 = exp(ep*Z0)*W0
Z *= -17.0/8.0;
SG.deriv(U, tmp); Z += tmp; // -17/32*Z0 +Z1
Z *= 8.0/9.0; // Z = -17/36*Z0 +8/9*Z1
Gimpl::update_field(Z, U, -2.0*epsilon); // U_= W2 = exp(ep*Z)*W1
Z *= -4.0/3.0;
SG.deriv(U, tmp); Z += tmp; // 4/3*(17/36*Z0 -8/9*Z1) +Z2
Z *= 3.0/4.0; // Z = 17/36*Z0 -8/9*Z1 +3/4*Z2
Gimpl::update_field(Z, U, -2.0*epsilon); // V(t+e) = exp(ep*Z)*W2
}
RealD energyDensityPlaquette(unsigned int step, const GaugeField& U) const {
RealD td = tau(step);
return 2.0 * td * td * SG.S(Uflow)/volume;
}
void WilsonFlow::smear(GaugeField& out, const GaugeField& in) const {
out = in;
RealD volume = out._grid->gSites();
for (unsigned int step = 0; step < Nstep; step++) {
evolve_step(out);
// Energy density, plaquette
std::cout << GridLogMessage
<< "[WilsonFlow] Energy Density (step) : "
<< step
<< " " << energyDensityPlaquette(step, out)
<< std::endl;
}
} // namespace QCD
} // namespace Grid
#endif // WILSONFLOW_H