SpECTRE  v2026.04.01
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gh::Tags::TimeDerivLapseCompute< SpatialDim, Frame > Struct Template Reference

Compute item to get time derivative of lapse ( \(\alpha\)) from the generalized harmonic variables, lapse, shift and the spacetime unit normal 1-form. More...

#include <TimeDerivOfLapse.hpp>

Public Types

using argument_tags
using return_type = Scalar<DataVector>
using base = ::Tags::dt<gr::Tags::Lapse<DataVector>>
Public Types inherited from Tags::dt< gr::Tags::Lapse< DataVector > >
using type
using tag

Static Public Attributes

static constexpr auto function

Detailed Description

template<size_t SpatialDim, typename Frame>
struct gh::Tags::TimeDerivLapseCompute< SpatialDim, Frame >

Compute item to get time derivative of lapse ( \(\alpha\)) from the generalized harmonic variables, lapse, shift and the spacetime unit normal 1-form.

Details

See time_deriv_of_lapse(). Can be retrieved using gr::Tags::Lapse wrapped in Tags::dt.

Member Typedef Documentation

◆ argument_tags

template<size_t SpatialDim, typename Frame>
using gh::Tags::TimeDerivLapseCompute< SpatialDim, Frame >::argument_tags
Initial value:
tmpl::list<gr::Tags::Lapse<DataVector>,
Auxiliary variable which is analytically the spatial derivative of the spacetime metric.
Definition Tags.hpp:38
Conjugate momentum to the spacetime metric.
Definition Tags.hpp:27
Definition Tags.hpp:61
Definition Tags.hpp:100

Member Data Documentation

◆ function

template<size_t SpatialDim, typename Frame>
auto gh::Tags::TimeDerivLapseCompute< SpatialDim, Frame >::function
staticconstexpr
Initial value:
= static_cast<void (*)(
const tnsr::I<DataVector, SpatialDim, Frame>&,
const tnsr::A<DataVector, SpatialDim, Frame>&,
const tnsr::iaa<DataVector, SpatialDim, Frame>&,
const tnsr::aa<DataVector, SpatialDim, Frame>&)>(
Require a pointer to not be a nullptr
Definition Gsl.hpp:197
void time_deriv_of_lapse(gsl::not_null< Scalar< DataType > * > dt_lapse, const Scalar< DataType > &lapse, const tnsr::I< DataType, SpatialDim, Frame > &shift, const tnsr::A< DataType, SpatialDim, Frame > &spacetime_unit_normal, const tnsr::iaa< DataType, SpatialDim, Frame > &phi, const tnsr::aa< DataType, SpatialDim, Frame > &pi)
Computes time derivative of lapse ( ) from the generalized harmonic variables, lapse,...
Tensor< T, Symmetry<>, index_list<> > Scalar
Scalar type.
Definition TypeAliases.hpp:21

The documentation for this struct was generated from the following file:
  • src/PointwiseFunctions/GeneralRelativity/GeneralizedHarmonic/TimeDerivOfLapse.hpp