xCoba : Equations of motion of in spherical symmetric components

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Zaki

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Oct 4, 2022, 9:40:34 AM10/4/22
to xAct Tensor Computer Algebra
Hi to all,

I have a problem getting the equations of motions of the theory of Einstein scalar Gauss Bonnet gravity in spherical components, many terms are not calculated I dont know why, I think that the coupling between the Ricci with the covariant derivative of scalar field in the Eom make it more complicated . Even If I added many times "ToBasis" or "Tovalues" or try to simplify

Could you check that please I tried everything possible 

I attached my notebook

Thank you very much in advance

Best wishes
Zakaria
Black holes of Einstein scalar Gauss Bonnet gravity.nb

Asghar Muhammad

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Dec 18, 2025, 7:40:24 AM (yesterday) Dec 18
to xAct Tensor Computer Algebra

Dear 

I hope this message finds you well.

I have attached a Mathematica notebook containing the equations of motion for Scalar–Einstein–Gauss–Bonnet gravity. I would greatly appreciate your guidance on how to convert these equations into the standard textbook form, making them academically rigorous and correct.

Thank you very much for your time and assistance.

Best regards,

Muhammad Asghar
Scalar Gauss Bonnet.nb
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