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97 lines
2.8 KiB
C++
97 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/utils/WilsonLoops.h
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Copyright (C) 2015
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Author: neo <cossu@post.kek.jp>
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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_OBJS_H
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#define SCALAR_OBJS_H
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namespace Grid {
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// FIXME drop the QCD namespace in Nd
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// Scalar field obs
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template <class Impl>
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class ScalarObs {
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public:
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//////////////////////////////////////////////////
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// squared field
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//////////////////////////////////////////////////
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static void phisquared(typename Impl::Field &fsq,
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const typename Impl::Field &f) {
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fsq = f * f;
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}
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//////////////////////////////////////////////////
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// phi^4 interaction term
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//////////////////////////////////////////////////
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static void phifourth(typename Impl::Field &fsq,
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const typename Impl::Field &f) {
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fsq = f * f * f * f;
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}
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//////////////////////////////////////////////////
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// phi(x)phi(x+mu)
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//////////////////////////////////////////////////
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static void phider(typename Impl::Field &fsq,
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const typename Impl::Field &f) {
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fsq = Cshift(f, 0, -1) * f;
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for (int mu = 1; mu < QCD::Nd; mu++) fsq += Cshift(f, mu, -1) * f;
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}
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//////////////////////////////////////////////////
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// Vol sum of the previous obs.
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//////////////////////////////////////////////////
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static RealD sumphider(const typename Impl::Field &f) {
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typename Impl::Field tmp(f._grid);
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tmp = Cshift(f, 0, -1) * f;
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for (int mu = 1; mu < QCD::Nd; mu++) {
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tmp += Cshift(f, mu, -1) * f;
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}
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return -sum(trace(tmp));
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}
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static RealD sumphisquared(const typename Impl::Field &f) {
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typename Impl::Field tmp(f._grid);
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tmp = f * f;
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return sum(trace(tmp));
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}
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static RealD sumphifourth(const typename Impl::Field &f) {
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typename Impl::Field tmp(f._grid);
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phifourth(tmp, f);
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return sum(trace(tmp));
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}
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};
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}
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#endif
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