Line data    Source code

       1           0 : // Distributed under the MIT License.
       2             : // See LICENSE.txt for details.
       3             : 
       4             : #pragma once
       5             : 
       6             : #include <cmath>
       7             : #include <cstddef>
       8             : #include <cstdint>
       9             : #include <utility>
      10             : 
      11             : #include "DataStructures/DataBox/Prefixes.hpp"
      12             : #include "DataStructures/DataBox/Tag.hpp"
      13             : #include "DataStructures/Tensor/EagerMath/DeterminantAndInverse.hpp"
      14             : #include "DataStructures/Tensor/Tensor.hpp"
      15             : #include "DataStructures/VariablesTag.hpp"
      16             : #include "NumericalAlgorithms/LinearOperators/PartialDerivatives.hpp"
      17             : #include "PointwiseFunctions/GeneralRelativity/Tags.hpp"
      18             : #include "Utilities/ContainerHelpers.hpp"
      19             : #include "Utilities/Gsl.hpp"
      20             : #include "Utilities/TMPL.hpp"
      21             : #include "Utilities/TaggedTuple.hpp"
      22             : 
      23             : /// \ingroup GeneralRelativityGroup
      24             : /// Holds functions related to general relativity.
      25             : namespace gr {
      26             : /// @{
      27             : /*!
      28             :  * \ingroup GeneralRelativityGroup
      29             :  * \brief Compute spatial metric from spacetime metric.
      30             :  * \details Simply pull out the spatial components.
      31             :  */
      32             : template <typename DataType, size_t SpatialDim, typename Frame>
      33           1 : tnsr::ii<DataType, SpatialDim, Frame> spatial_metric(
      34             :     const tnsr::aa<DataType, SpatialDim, Frame>& spacetime_metric);
      35             : 
      36             : template <typename DataType, size_t SpatialDim, typename Frame>
      37           1 : void spatial_metric(
      38             :     gsl::not_null<tnsr::ii<DataType, SpatialDim, Frame>*> spatial_metric,
      39             :     const tnsr::aa<DataType, SpatialDim, Frame>& spacetime_metric);
      40             : /// @}
      41             : 
      42             : namespace Tags {
      43             : /*!
      44             :  * \brief Compute item for spatial metric \f$\gamma_{ij}\f$ from the
      45             :  * spacetime metric \f$g_{ab}\f$.
      46             :  *
      47             :  * \details Can be retrieved using `gr::Tags::SpatialMetric`.
      48             :  */
      49             : template <typename DataType, size_t SpatialDim, typename Frame>
      50           1 : struct SpatialMetricCompute : SpatialMetric<DataType, SpatialDim, Frame>,
      51             :                               db::ComputeTag {
      52           0 :   using argument_tags =
      53             :       tmpl::list<SpacetimeMetric<DataType, SpatialDim, Frame>>;
      54             : 
      55           0 :   using return_type = tnsr::ii<DataType, SpatialDim, Frame>;
      56             : 
      57           0 :   static constexpr auto function = static_cast<void (*)(
      58             :       gsl::not_null<tnsr::ii<DataType, SpatialDim, Frame>*>,
      59             :       const tnsr::aa<DataType, SpatialDim, Frame>&)>(
      60             :       &spatial_metric<DataType, SpatialDim, Frame>);
      61             : 
      62           0 :   using base = SpatialMetric<DataType, SpatialDim, Frame>;
      63             : };
      64             : }  // namespace Tags
      65             : }  // namespace gr