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84 lines
2.7 KiB
C++
84 lines
2.7 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/qcd/action/gauge/WilsonGaugeAction.h
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Copyright (C) 2015
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Author: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>
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Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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Author: neo <cossu@post.kek.jp>
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Author: paboyle <paboyle@ph.ed.ac.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution
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directory
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*************************************************************************************/
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/* END LEGAL */
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#ifndef SCALAR_ACTION_H
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#define SCALAR_ACTION_H
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namespace Grid {
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// FIXME drop the QCD namespace everywhere here
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template <class Impl>
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class ScalarAction : public QCD::Action<typename Impl::Field> {
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public:
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INHERIT_FIELD_TYPES(Impl);
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private:
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RealD mass_square;
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RealD lambda;
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public:
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ScalarAction(RealD ms, RealD l) : mass_square(ms), lambda(l) {}
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virtual std::string LogParameters() {
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std::stringstream sstream;
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sstream << GridLogMessage << "[ScalarAction] lambda : " << lambda << std::endl;
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sstream << GridLogMessage << "[ScalarAction] mass_square : " << mass_square << std::endl;
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return sstream.str();
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}
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virtual std::string action_name() {return "ScalarAction";}
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virtual void refresh(const Field &U, GridParallelRNG &pRNG) {} // noop as no pseudoferms
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virtual RealD S(const Field &p) {
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return (mass_square * 0.5 + QCD::Nd) * ScalarObs<Impl>::sumphisquared(p) +
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(lambda / 24.) * ScalarObs<Impl>::sumphifourth(p) +
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ScalarObs<Impl>::sumphider(p);
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};
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virtual void deriv(const Field &p,
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Field &force) {
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Field tmp(p._grid);
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Field p2(p._grid);
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ScalarObs<Impl>::phisquared(p2, p);
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tmp = -(Cshift(p, 0, -1) + Cshift(p, 0, 1));
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for (int mu = 1; mu < QCD::Nd; mu++) tmp -= Cshift(p, mu, -1) + Cshift(p, mu, 1);
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force =+(mass_square + 2. * QCD::Nd) * p + (lambda / 6.) * p2 * p + tmp;
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}
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};
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} // namespace Grid
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#endif // SCALAR_ACTION_H
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