SpECTRE Documentation Coverage Report
Current view: top level - PointwiseFunctions/GeneralRelativity - WeylTypeD1.hpp Coverage Total Hit
Commit: 0d1d717af84a81fb1284a20c4013708fe85cc2f0 Lines: 40.0 % 15 6
Test Date: 2026-10-22 17:29:42
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            Line data    Source code
       1            0 : // Distributed under the MIT License.
       2              : // See LICENSE.txt for details.
       3              : 
       4              : #pragma once
       5              : 
       6              : #include <cstddef>
       7              : 
       8              : #include "DataStructures/DataBox/Tag.hpp"
       9              : #include "DataStructures/Tensor/TypeAliases.hpp"
      10              : #include "PointwiseFunctions/GeneralRelativity/Tags.hpp"
      11              : #include "Utilities/TMPL.hpp"
      12              : 
      13              : /// \cond
      14              : namespace gsl {
      15              : template <typename>
      16              : struct not_null;
      17              : }  // namespace gsl
      18              : /// \endcond
      19              : 
      20              : namespace gr {
      21              : 
      22              : /// @{
      23              : /*!
      24              :  * \ingroup GeneralRelativityGroup
      25              :  * \brief Computes a quantity measuring how far from type D spacetime is.
      26              :  *
      27              :  * \details Computes a quantity measuring how far from type D spacetime is,
      28              :  * using measure D1 [Eq. (8) of \cite Bhagwat2017tkm]:
      29              :  *
      30              :  * \f{align}{
      31              :  * \frac{a}{12} \gamma_{ij} - \frac{b}{a} E_{ij} - 4
      32              :  * E_{i}^{k} E_{jk} = 0 \f}
      33              :  *
      34              :  * where \f$\gamma_{ij}\f$ is the spatial metric and \f$E_{ij}\f$ is the
      35              :  * electric part ofthe Weyl tensor.
      36              :  */
      37              : template <typename DataType, size_t SpatialDim, typename Frame>
      38            1 : tnsr::ii<DataType, SpatialDim, Frame> weyl_type_D1(
      39              :     const tnsr::ii<DataType, SpatialDim, Frame>& weyl_electric,
      40              :     const tnsr::ii<DataType, SpatialDim, Frame>& spatial_metric,
      41              :     const tnsr::II<DataType, SpatialDim, Frame>& inverse_spatial_metric);
      42              : 
      43              : template <typename DataType, size_t SpatialDim, typename Frame>
      44            1 : void weyl_type_D1(
      45              :     gsl::not_null<tnsr::ii<DataType, SpatialDim, Frame>*> weyl_type_D1,
      46              :     const tnsr::ii<DataType, SpatialDim, Frame>& weyl_electric,
      47              :     const tnsr::ii<DataType, SpatialDim, Frame>& spatial_metric,
      48              :     const tnsr::II<DataType, SpatialDim, Frame>& inverse_spatial_metric);
      49              : /// @}
      50              : 
      51              : /// @{
      52              : /*!
      53              :  * \ingroup GeneralRelativityGroup
      54              :  * \brief Computes the scalar \f$D_{ij} D^{ij}\f$ , a measure of a spacetime's
      55              :  * devitation from type D.
      56              :  *
      57              :  * \details Computes the scalar \f$D_{ij} D^{ij}\f$ from \f$D_{ij}\f$ (Eq. (8)
      58              :  * of \cite Bhagwat2017tkm] and the inverse spatial metric \f$\gamma^{ij}\f$,
      59              :  * i.e. \f$D = \gamma^{ik}\gamma^{jl}D_{ij}D_{kl}\f$.
      60              :  *
      61              :  * \note The Weyl Type D1 \f$D_{ij}\f$ is available via gr::weyl_type_D1.
      62              :  */
      63              : template <typename DataType, size_t SpatialDim, typename Frame>
      64            1 : void weyl_type_D1_scalar(
      65              :     gsl::not_null<Scalar<DataType>*> weyl_type_D1_scalar_result,
      66              :     const tnsr::ii<DataType, SpatialDim, Frame>& weyl_type_D1,
      67              :     const tnsr::II<DataType, SpatialDim, Frame>& inverse_spatial_metric);
      68              : 
      69              : template <typename DataType, size_t SpatialDim, typename Frame>
      70            1 : Scalar<DataType> weyl_type_D1_scalar(
      71              :     const tnsr::ii<DataType, SpatialDim, Frame>& weyl_type_D1,
      72              :     const tnsr::II<DataType, SpatialDim, Frame>& inverse_spatial_metric);
      73              : 
      74              : /// @}
      75              : 
      76              : namespace Tags {
      77              : /// Compute item for WeylTypeD1
      78              : /// Computed from WeylElectric, SpatialMetric, and InverseSpatialMetric
      79              : ///
      80              : /// Can be retrieved using gr::Tags::WeylTypeD1
      81              : template <typename DataType, size_t SpatialDim, typename Frame>
      82            1 : struct WeylTypeD1Compute : WeylTypeD1<DataType, SpatialDim, Frame>,
      83              :                            db::ComputeTag {
      84            0 :   using argument_tags =
      85              :       tmpl::list<gr::Tags::WeylElectric<DataType, SpatialDim, Frame>,
      86              :                  gr::Tags::SpatialMetric<DataType, SpatialDim, Frame>,
      87              :                  gr::Tags::InverseSpatialMetric<DataType, SpatialDim, Frame>>;
      88              : 
      89            0 :   using return_type = tnsr::ii<DataType, SpatialDim, Frame>;
      90              : 
      91            0 :   static constexpr auto function = static_cast<void (*)(
      92              :       gsl::not_null<tnsr::ii<DataType, SpatialDim, Frame>*>,
      93              :       const tnsr::ii<DataType, SpatialDim, Frame>&,
      94              :       const tnsr::ii<DataType, SpatialDim, Frame>&,
      95              :       const tnsr::II<DataType, SpatialDim, Frame>&)>(
      96              :       &weyl_type_D1<DataType, SpatialDim, Frame>);
      97              : 
      98            0 :   using base = WeylTypeD1<DataType, SpatialDim, Frame>;
      99              : };
     100              : 
     101              : /// Can be retrieved using gr::Tags::WeylTypeD1Scalar
     102              : template <typename DataType, size_t SpatialDim, typename Frame>
     103            1 : struct WeylTypeD1ScalarCompute : WeylTypeD1Scalar<DataType>, db::ComputeTag {
     104            0 :   using argument_tags =
     105              :       tmpl::list<gr::Tags::WeylTypeD1<DataType, SpatialDim, Frame>,
     106              :                  gr::Tags::InverseSpatialMetric<DataType, SpatialDim, Frame>>;
     107              : 
     108            0 :   using return_type = Scalar<DataType>;
     109              : 
     110            0 :   static constexpr auto function =
     111              :       static_cast<void (*)(gsl::not_null<Scalar<DataType>*>,
     112              :                            const tnsr::ii<DataType, SpatialDim, Frame>&,
     113              :                            const tnsr::II<DataType, SpatialDim, Frame>&)>(
     114              :           &gr::weyl_type_D1_scalar<DataType, SpatialDim, Frame>);
     115              : 
     116            0 :   using base = WeylTypeD1Scalar<DataType>;
     117              : };
     118              : }  // namespace Tags
     119              : }  // namespace gr
        

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