#877: EinsteinExact arrangement should be added to the Einstein Toolkit ------------------------------------+--------------------------------------- Reporter: hinder | Owner: Type: task | Status: new Priority: major | Milestone: ET_2012_05 Component: EinsteinToolkit thorn | Version: Resolution: | Keywords: ------------------------------------+---------------------------------------
Comment (by barry.wardell):
Replying to [comment:6 barry.wardell]:
Replying to [comment:4 bmundim]:
I have looked into the arrangement documentation and I thought it is
really in good shape. I spot a few minor details there that would be good to have it fixed/commented soon:
Eq. 4 is missing the 3-metric in the time derivative term.
Eq. 5 seems to have two matrices describing rotations around the
same axis. Is this intentional? I would expect to express the euler angles in terms of rotation matrices around each of the 3 axes.
Thanks for pointing these out. I will look into and fix them.
Point 1) has now been fixed. With regards to point 2), I think Eq. 5 is correct as it currently is, although I can understand how it might not be clear that that is the case. There are lots of different conventions with how to define the Euler angles. The particular version used by EinsteinExact is the one described at Mathworld [http://mathworld.wolfram.com/EulerAngles.html] and I believe is the same as is used by Exact.