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Opened 6 years ago

Last modified 6 weeks ago

#1201 new defect

Incorrect dtshift in Exact with shift_add_{x,y,z} parameters

Reported by: Barry Wardell Owned by:
Priority: major Milestone:
Component: EinsteinToolkit thorn Version:
Keywords: Cc:

Description (last modified by Roland Haas)

The Exact thorn has shift_add_{x,y,z} parameters for adding a constant to the shift. Considering these as a coordinate transformation using a vector v^i = [shift_add_x, shift_add_y, shift_add_z], such a transformation should affect both the shift and its time derivative. This is because the time derivative in the new coordinates differs from the time derivative in the old coordinates by a term v^j d(beta^i)/dx^j. This is correctly implemented as a 4D coordinate transformation in the EinsteinExact thorns and I have verified that the difference relative to the Exact thorn is given by this missing term.

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Change History (5)

comment:1 Changed 5 years ago by Erik Schnetter

Milestone: ET_2013_05

comment:2 Changed 5 years ago by Erik Schnetter

This problem has existed for a long time. I would not make this a release goal.

comment:3 Changed 5 years ago by Frank Löffler

Milestone: ET_2013_05

Agreed.

comment:4 Changed 11 months ago by Roland Haas

Description: modified (diff)

comment:5 Changed 6 weeks ago by Roland Haas

This still exists. Do we want to document the actual behaviour and close the bug?

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