SpECTRE
v2023.05.16

Holds a quantity that's similar to the shift, but isn't the shift, on the ExcisionSurface
.
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#include <QueueTags.hpp>
Public Types  
using  type = tnsr::I< DataVector, 3, Frame > 
Holds a quantity that's similar to the shift, but isn't the shift, on the ExcisionSurface
.
This holds
\begin{equation} \beta^i \frac{\partial x^\hat{i}}{\partial x^i} = \hat{beta}^\hat{i} + \frac{\partial x^\hat{i}}{\partial t} \end{equation}
where hatted quantities are in the distorted frame and nonhatted quantities are in the grid frame.