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A Clone of Maxima's repo
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rieman and ricci tensors for schwarzschild metric #3486

Open rtoy opened 3 months ago

rtoy commented 3 months ago

Imported from SourceForge on 2024-07-08 01:55:44 Created by igor_filippov on 2020-09-15 23:37:36 Original: https://sourceforge.net/p/maxima/bugs/3655

Hello,

I was testing several packages for doing general relativity calculations and I ran into a problem with ctensor package for Maxima. The calculated Riemann tensor seems to have diagonal components, even though it should be antisymmetric in the last two indices. The Ricci tensor has a non-zero component. Perhaps I misunderstood the documentation on how to set up the calculation with Maxima, but in this case I would request the documentation to be updated. Thank you for your work on Maxima. It is an amazing project.

I have attached wxMaxima notebook with my session.

Igor

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rtoy commented 3 months ago

Imported from SourceForge on 2024-07-08 01:55:45 Created by richardgobeli on 2020-09-16 00:45:31 Original: https://sourceforge.net/p/maxima/bugs/3655/#0ffc

set ratfac to true and your ricci will be zero. The upper index, which you think is first, is actually at the end for wxMaxima in the Riemann tensor. So it is the second and third that are antisymetric.

rtoy commented 3 months ago

Imported from SourceForge on 2024-07-08 01:55:49 Created by igor_filippov on 2020-09-16 01:09:38 Original: https://sourceforge.net/p/maxima/bugs/3655/#32dc

Thank you for the quick response. I suspected that the problem is on my side!

rtoy commented 3 months ago

Imported from SourceForge on 2024-07-08 01:55:52 Created by vttoth on 2020-09-16 04:24:57 Original: https://sourceforge.net/p/maxima/bugs/3655/#2322