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81 lines
2.8 KiB
C++
81 lines
2.8 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: Guido Cossu <guido,cossu@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_INT_ACTION_H
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#define SCALAR_INT_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 ScalarInteractionAction : public QCD::Action<typename Impl::Field> {
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RealD mass_square;
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RealD lambda;
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public:
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INHERIT_FIELD_TYPES(Impl);
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ScalarInteractionAction(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,
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GridParallelRNG &pRNG) {} // noop as no pseudoferms
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virtual RealD S(const Field &p) {
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Field action(p._grid);
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Field pshift(p._grid);
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Field phisquared(p._grid);
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phisquared = p*p;
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action = (2.0*QCD::Nd + mass_square)*phisquared + lambda*phisquared*phisquared;
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for (int mu = 0; mu < QCD::Nd; mu++) {
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pshift = Cshift(p, mu, +1); // not efficient implement with stencils
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action -= pshift*p + p*pshift;
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}
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return -(TensorRemove(sum(trace(action)))).real();
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};
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virtual void deriv(const Field &p,
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Field &force) {
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force = (2.0*QCD::Nd + mass_square)*p + 2.0*lambda*p*p*p;
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// following is inefficient
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for (int mu = 0; mu < QCD::Nd; mu++) force -= Cshift(p, mu, -1) + Cshift(p, mu, 1);
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}
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};
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} // namespace Grid
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#endif // SCALAR_INT_ACTION_H
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