Warp Factory
  • What is Warp Factory?
  • Overview
    • Installing Warp Factory
    • Workflow
    • Codebase Structure
    • Object Types
    • Frames
  • Examples
    • Metrics
      • M1 - First Metric
      • M2 - Default Metrics
      • M3 - Building a Metric
    • Energy Tensor
      • T1 - First Energy Tensor
      • T2 - Cartoon Methods
      • T3 - GPU Computation
      • T4 - Solver Order
      • T5 - Errors
    • Analysis
      • A1 - Energy Conditions
      • A2 - Metric Scalars
      • A3 - Eval Metric
      • A4 - Momentum Flow
    • Warp Shell
      • W1 Warp Shell Comoving
  • Modules
    • Metrics Module
      • Metric Library
        • metricGet_Minkowski
        • metricGet_Alcubierre
        • metricGet_Lentz
        • metricGet_VanDenBroeck
        • metricGet_WarpShellComoving
        • metricGet_ModifiedTime
        • metricGet_Schwarzschild
      • Metric Functions
        • setMinkowski
        • setMinkowskiThreePlusOne
        • threePlusOneBuilder
        • threePlusOneDecomposer
    • Analyzer Module
      • getMomentumFlowLines
      • doFrameTransfer
      • changeTensorIndex
      • getScalars
      • getEnergyConditions
      • evalMetric
    • Solver Module
      • getEnergyTensor
      • verifyTensor
    • Visualizer Module
      • plotThreePlusOne
      • plotTensor
      • Plot Functions
    • Units Module
  • General
    • Contributing
    • FAQ
    • Citing Warp Factory
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  1. Overview

Frames

The use of frames in Warp Factory

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Last updated 1 year ago

When analyzing the stress-energy tensor the frame of observation influences the values that will be observed. In Warp Factory frame transformations are done on the stress-energy tensor using observer tetrads that can transform the tensor. Currently, this transformation occurs using the function and is an important step that is used in the function which evaluates the observers for energy condition violations.

Only the Eulerian frame is defined which is used to determine the energy conditions, see for details on the computation of the frame.

The following frames are defined within Warp Factory:

Frame
Description

Eulerian

Local Eulerian stress-energy tensor at all points in spacetime. Note that this takes a specific spatial orientation in Warp Factory aligned with the coordinate system.

doFrameTransfer
getEnergyConditions
Eulerian Frame