SpECTRE Documentation Coverage Report
Current view: top level - PointwiseFunctions/GeneralRelativity - CubicCurvatureScalars.hpp Coverage Total Hit
Commit: 0d1d717af84a81fb1284a20c4013708fe85cc2f0 Lines: 21.1 % 19 4
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/Gsl.hpp"
      12              : #include "Utilities/TMPL.hpp"
      13              : 
      14              : namespace gr {
      15              : 
      16              : /// @{
      17              : /*!
      18              :  * Computes the real part of the cubic invariant of the Weyl tensor from the
      19              :  * electric and magnetic parts. The cubic invariant is e.g. given in Equation
      20              :  * (10) of \cite Dennison:2012vf
      21              :  * \f[
      22              :  *   \mathcal{J} = \left(-\frac{1}{6} E^i_j E^j_k E^k_i + \frac{1}{2} E^i_j
      23              :  *    B^j_k B^k_i\right) + i\left(\frac{1}{6} B^i_j B^j_k B^k_i - \frac{1}{2}
      24              :  *    B^i_j E^j_k E^k_i\right)
      25              :  * \f]
      26              :  */
      27              : template <typename DataType, size_t Dim, typename Frame>
      28            1 : void cubic_invariant_real(
      29              :     gsl::not_null<Scalar<DataType>*> result,
      30              :     const tnsr::ii<DataType, Dim, Frame>& weyl_electric,
      31              :     const tnsr::ii<DataType, Dim, Frame>& weyl_magnetic,
      32              :     const tnsr::II<DataType, Dim, Frame>& inverse_spatial_metric);
      33              : 
      34              : template <typename DataType, size_t Dim, typename Frame>
      35            1 : Scalar<DataType> cubic_invariant_real(
      36              :     const tnsr::ii<DataType, Dim, Frame>& weyl_electric,
      37              :     const tnsr::ii<DataType, Dim, Frame>& weyl_magnetic,
      38              :     const tnsr::II<DataType, Dim, Frame>& inverse_spatial_metric);
      39              : /// @}
      40              : 
      41              : /// @{
      42              : /*!
      43              :  * Computes the imaginary part of the cubic invariant of the Weyl tensor from
      44              :  * the electric and magnetic parts. The cubic invariant is e.g. given in
      45              :  * Equation (10) of \cite Dennison:2012vf
      46              :  * \f[
      47              :  *   \mathcal{J} = \left(-\frac{1}{6} E^i_j E^j_k E^k_i + \frac{1}{2} E^i_j
      48              :  *    B^j_k B^k_i\right) + i\left(\frac{1}{6} B^i_j B^j_k B^k_i - \frac{1}{2}
      49              :  *    B^i_j E^j_k E^k_i\right)
      50              :  * \f]
      51              :  */
      52              : template <typename DataType, size_t Dim, typename Frame>
      53            1 : void cubic_invariant_imag(
      54              :     gsl::not_null<Scalar<DataType>*> result,
      55              :     const tnsr::ii<DataType, Dim, Frame>& weyl_electric,
      56              :     const tnsr::ii<DataType, Dim, Frame>& weyl_magnetic,
      57              :     const tnsr::II<DataType, Dim, Frame>& inverse_spatial_metric);
      58              : 
      59              : template <typename DataType, size_t Dim, typename Frame>
      60            1 : Scalar<DataType> cubic_invariant_imag(
      61              :     const tnsr::ii<DataType, Dim, Frame>& weyl_electric,
      62              :     const tnsr::ii<DataType, Dim, Frame>& weyl_magnetic,
      63              :     const tnsr::II<DataType, Dim, Frame>& inverse_spatial_metric);
      64              : /// @}
      65              : 
      66              : }  // namespace gr
      67              : 
      68              : namespace gr::Tags {
      69              : // Simple and compute tags for cubic invariants
      70              : template <typename DataType>
      71            0 : struct CubicInvariantReal : db::SimpleTag {
      72            0 :   using type = Scalar<DataType>;
      73              : };
      74              : 
      75              : template <typename DataType, size_t Dim, typename Frame>
      76            0 : struct CubicInvariantRealCompute : CubicInvariantReal<DataType>,
      77              :                                    db::ComputeTag {
      78            0 :   using argument_tags =
      79              :       tmpl::list<gr::Tags::WeylElectric<DataType, Dim, Frame>,
      80              :                  gr::Tags::WeylMagnetic<DataType, Dim, Frame>,
      81              :                  gr::Tags::InverseSpatialMetric<DataType, Dim, Frame>>;
      82            0 :   using return_type = Scalar<DataType>;
      83            0 :   static constexpr auto function = static_cast<void (*)(
      84              :       gsl::not_null<Scalar<DataType>*>, const tnsr::ii<DataType, Dim, Frame>&,
      85              :       const tnsr::ii<DataType, Dim, Frame>&,
      86              :       const tnsr::II<DataType, Dim, Frame>&)>(
      87              :       &gr::cubic_invariant_real<DataType, Dim, Frame>);
      88            0 :   using base = CubicInvariantReal<DataType>;
      89              : };
      90              : 
      91              : template <typename DataType>
      92            0 : struct CubicInvariantImag : db::SimpleTag {
      93            0 :   using type = Scalar<DataType>;
      94              : };
      95              : 
      96              : template <typename DataType, size_t Dim, typename Frame>
      97            0 : struct CubicInvariantImagCompute : CubicInvariantImag<DataType>,
      98              :                                    db::ComputeTag {
      99            0 :   using argument_tags =
     100              :       tmpl::list<gr::Tags::WeylElectric<DataType, Dim, Frame>,
     101              :                  gr::Tags::WeylMagnetic<DataType, Dim, Frame>,
     102              :                  gr::Tags::InverseSpatialMetric<DataType, Dim, Frame>>;
     103            0 :   using return_type = Scalar<DataType>;
     104            0 :   static constexpr auto function = static_cast<void (*)(
     105              :       gsl::not_null<Scalar<DataType>*>, const tnsr::ii<DataType, Dim, Frame>&,
     106              :       const tnsr::ii<DataType, Dim, Frame>&,
     107              :       const tnsr::II<DataType, Dim, Frame>&)>(
     108              :       &gr::cubic_invariant_imag<DataType, Dim, Frame>);
     109            0 :   using base = CubicInvariantImag<DataType>;
     110              : };
     111              : }  // namespace gr::Tags
        

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