SpECTRE Documentation Coverage Report
Current view: top level - PointwiseFunctions/GeneralRelativity - WeylTypeD1.hpp Hit Total Coverage
Commit: 1f2210958b4f38fdc0400907ee7c6d5af5111418 Lines: 6 15 40.0 %
Date: 2025-12-05 05:03:31
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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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