File forwardcovariantderivative.h

File List > algebra > gaugealgebra > forwardcovariantderivative.h
#ifndef COSMOINTERFACE_GAUGEALGEBRA_FORWARDCOVARIANTDERIVATIVE_H
#define COSMOINTERFACE_GAUGEALGEBRA_FORWARDCOVARIANTDERIVATIVE_H

/* This file is part of TempLat, available at https://cosmolattice.github.io/templat .
   Copyright 2021-2026 The TempLat authors, see AUTHORS.md.
   Released under the MIT license, see LICENSE.md. */

// File info: Main contributor(s): Adrien Florio, Year: 2019

#include "TempLat/util/assignabletuple.h"
#include "TempLat/lattice/algebra/listoperators/foldmultiply.h"
#include "TempLat/util/rangeiteration/make_list_tag.h"

namespace TempLat
{
  /*
      template<size_t dim, class... Args>
      auto ForwardCovariantDerivative(Args... args)
      {
          constexpr size_t size = sizeof...(args);
          auto list = make_list(args...);

          auto scalar = list.getComp(Tag<size-1>());

          //constexpr size_t dim = decltype(list.getComp(0_c))::size;//get the spatial dimension from tone of the gauge
     vector. auto dx = decltype(scalar)::Getter::get(scalar,0_c).getDx();

          auto CovPlus = MakeVector(i,1,dim,
                                   (1.0/dx)*(binary_fold(
                                           [](auto x, auto y){return x*y;},
                                           MakeArray(j,0,size-2,list.getComp(j)(i)),
                                           [](auto x){return x;},shift(scalar,i))
                                           - scalar)
          );

          return CovPlus;

      }
  */
} // namespace TempLat

#endif