Frames

The use of frames in Warp Factory

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 doFrameTransfer function and is an important step that is used in the getEnergyConditions 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.