SpECTRE Documentation Coverage Report
Current view: top level - PointwiseFunctions/GeneralRelativity - WeylTypeD1.hpp Hit Total Coverage
Commit: f8ea4a52db6a7b766b531a9ef6054857b7453f1d Lines: 6 15 40.0 %
Date: 2024-05-03 17:20:07
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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             : 
      12             : /// \cond
      13             : namespace gsl {
      14             : template <typename>
      15             : struct not_null;
      16             : }  // namespace gsl
      17             : /// \endcond
      18             : 
      19             : namespace gr {
      20             : 
      21             : /// @{
      22             : /*!
      23             :  * \ingroup GeneralRelativityGroup
      24             :  * \brief Computes a quantity measuring how far from type D spacetime is.
      25             :  *
      26             :  * \details Computes a quantity measuring how far from type D spacetime is,
      27             :  * using measure D1 [Eq. (8) of \cite Bhagwat2017tkm]:
      28             :  *
      29             :  * \f{align}{
      30             :  * \frac{a}{12} \gamma_{ij} - \frac{b}{a} E_{ij} - 4
      31             :  * E_{i}^{k} E_{jk} = 0 \f}
      32             :  *
      33             :  * where \f$\gamma_{ij}\f$ is the spatial metric and \f$E_{ij}\f$ is the
      34             :  * electric part ofthe Weyl tensor.
      35             :  */
      36             : template <typename DataType, size_t SpatialDim, typename Frame>
      37           1 : tnsr::ii<DataType, SpatialDim, Frame> weyl_type_D1(
      38             :     const tnsr::ii<DataType, SpatialDim, Frame>& weyl_electric,
      39             :     const tnsr::ii<DataType, SpatialDim, Frame>& spatial_metric,
      40             :     const tnsr::II<DataType, SpatialDim, Frame>& inverse_spatial_metric);
      41             : 
      42             : template <typename DataType, size_t SpatialDim, typename Frame>
      43           1 : void weyl_type_D1(
      44             :     const gsl::not_null<tnsr::ii<DataType, SpatialDim, Frame>*> weyl_type_D1,
      45             :     const tnsr::ii<DataType, SpatialDim, Frame>& weyl_electric,
      46             :     const tnsr::ii<DataType, SpatialDim, Frame>& spatial_metric,
      47             :     const tnsr::II<DataType, SpatialDim, Frame>& inverse_spatial_metric);
      48             : /// @}
      49             : 
      50             : /// @{
      51             : /*!
      52             :  * \ingroup GeneralRelativityGroup
      53             :  * \brief Computes the scalar \f$D_{ij} D^{ij}\f$ , a measure of a spacetime's
      54             :  * devitation from type D.
      55             :  *
      56             :  * \details Computes the scalar \f$D_{ij} D^{ij}\f$ from \f$D_{ij}\f$ (Eq. (8)
      57             :  * of \cite Bhagwat2017tkm] and the inverse spatial metric \f$\gamma^{ij}\f$,
      58             :  * i.e. \f$D = \gamma^{ik}\gamma^{jl}D_{ij}D_{kl}\f$.
      59             :  *
      60             :  * \note The Weyl Type D1 \f$D_{ij}\f$ is available via gr::weyl_type_D1.
      61             :  */
      62             : template <typename DataType, size_t SpatialDim, typename Frame>
      63           1 : void weyl_type_D1_scalar(
      64             :     const gsl::not_null<Scalar<DataType>*> weyl_type_D1_scalar_result,
      65             :     const tnsr::ii<DataType, SpatialDim, Frame>& weyl_type_D1,
      66             :     const tnsr::II<DataType, SpatialDim, Frame>& inverse_spatial_metric);
      67             : 
      68             : template <typename DataType, size_t SpatialDim, typename Frame>
      69           1 : Scalar<DataType> weyl_type_D1_scalar(
      70             :     const tnsr::ii<DataType, SpatialDim, Frame>& weyl_type_D1,
      71             :     const tnsr::II<DataType, SpatialDim, Frame>& inverse_spatial_metric);
      72             : 
      73             : /// @}
      74             : 
      75             : namespace Tags {
      76             : /// Compute item for WeylTypeD1
      77             : /// Computed from WeylElectric, SpatialMetric, and InverseSpatialMetric
      78             : ///
      79             : /// Can be retrieved using gr::Tags::WeylTypeD1
      80             : template <typename DataType, size_t SpatialDim, typename Frame>
      81           1 : struct WeylTypeD1Compute : WeylTypeD1<DataType, SpatialDim, Frame>,
      82             :                            db::ComputeTag {
      83           0 :   using argument_tags =
      84             :       tmpl::list<gr::Tags::WeylElectric<DataType, SpatialDim, Frame>,
      85             :                  gr::Tags::SpatialMetric<DataType, SpatialDim, Frame>,
      86             :                  gr::Tags::InverseSpatialMetric<DataType, SpatialDim, Frame>>;
      87             : 
      88           0 :   using return_type = tnsr::ii<DataType, SpatialDim, Frame>;
      89             : 
      90           0 :   static constexpr auto function = static_cast<void (*)(
      91             :       gsl::not_null<tnsr::ii<DataType, SpatialDim, Frame>*>,
      92             :       const tnsr::ii<DataType, SpatialDim, Frame>&,
      93             :       const tnsr::ii<DataType, SpatialDim, Frame>&,
      94             :       const tnsr::II<DataType, SpatialDim, Frame>&)>(
      95             :       &weyl_type_D1<DataType, SpatialDim, Frame>);
      96             : 
      97           0 :   using base = WeylTypeD1<DataType, SpatialDim, Frame>;
      98             : };
      99             : 
     100             : /// Can be retrieved using gr::Tags::WeylTypeD1Scalar
     101             : template <typename DataType, size_t SpatialDim, typename Frame>
     102           1 : struct WeylTypeD1ScalarCompute : WeylTypeD1Scalar<DataType>, db::ComputeTag {
     103           0 :   using argument_tags =
     104             :       tmpl::list<gr::Tags::WeylTypeD1Compute<DataType, SpatialDim, Frame>,
     105             :                  gr::Tags::InverseSpatialMetric<DataType, SpatialDim, Frame>>;
     106             : 
     107           0 :   using return_type = Scalar<DataType>;
     108             : 
     109           0 :   static constexpr auto function =
     110             :       static_cast<void (*)(gsl::not_null<Scalar<DataType>*>,
     111             :                            const tnsr::ii<DataType, SpatialDim, Frame>&,
     112             :                            const tnsr::II<DataType, SpatialDim, Frame>&)>(
     113             :           &gr::weyl_type_D1_scalar<DataType, SpatialDim, Frame>);
     114             : 
     115           0 :   using base = WeylTypeD1Scalar<DataType>;
     116             : };
     117             : }  // namespace Tags
     118             : }  // namespace gr

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