mirror of
https://github.com/paboyle/Grid.git
synced 2024-11-10 15:55:37 +00:00
77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
/*************************************************************************************
|
|
|
|
Grid physics library, www.github.com/paboyle/Grid
|
|
|
|
Source file: ./lib/qcd/action/gauge/WilsonGaugeAction.h
|
|
|
|
Copyright (C) 2015
|
|
|
|
Author: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>
|
|
Author: Peter Boyle <paboyle@ph.ed.ac.uk>
|
|
Author: neo <cossu@post.kek.jp>
|
|
Author: paboyle <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 */
|
|
#ifndef SCALAR_ACTION_H
|
|
#define SCALAR_ACTION_H
|
|
|
|
namespace Grid {
|
|
namespace QCD {
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// Wilson Gauge Action .. should I template the Nc etc..
|
|
////////////////////////////////////////////////////////////////////////
|
|
|
|
template <class Impl>
|
|
class ScalarAction : public Action<typename Impl::Field> {
|
|
public:
|
|
INHERIT_FIELD_TYPES(Impl);
|
|
|
|
private:
|
|
RealD mass_square;
|
|
RealD lambda;
|
|
|
|
public:
|
|
ScalarAction(RealD ms, RealD l) : mass_square(ms), lambda(l){};
|
|
|
|
virtual void refresh(const Field &U,
|
|
GridParallelRNG &pRNG){}; // noop as no pseudoferms
|
|
|
|
virtual RealD S(const Field &p) {
|
|
return (mass_square * 0.5 + Nd) * ScalarObs<Impl>::sumphisquared(p) +
|
|
(lambda / 24.) * ScalarObs<Impl>::sumphifourth(p) +
|
|
ScalarObs<Impl>::sumphider(p);
|
|
};
|
|
|
|
virtual void deriv(const Field &p,
|
|
Field &force) {
|
|
Field tmp(p._grid);
|
|
Field p2(p._grid);
|
|
ScalarObs<Impl>::phisquared(p2, p);
|
|
tmp = -(Cshift(p, 0, -1) + Cshift(p, 0, 1));
|
|
for (int mu = 1; mu < Nd; mu++) tmp -= Cshift(p, mu, -1) + Cshift(p, mu, 1);
|
|
|
|
force=+(mass_square + 2. * Nd) * p + (lambda / 6.) * p2 * p + tmp;
|
|
};
|
|
};
|
|
}
|
|
}
|
|
|
|
#endif |