General relativistic precession and the long-term stability of the solar system · HackerPapers discussions

General relativistic precession and the long-term stability of the solar system — mentioned by zyrxvo

Thu, 16 Mar 2023 02:27:14 GMT

I'm the first author on this paper being discussed here. <https://arxiv.org/abs/2303.05567> This post has driven the most traffic to my site ever. Forgive me for not understanding the social rules here, but I made an account today to join the incredible discussion here. If you have any questions I will do my best to answer them. However, you've all been answering each other's questions as well as I ever could've already. Edit: Added link to the preprint.

Paper and discussion history. A mention is not an endorsement.

General relativistic precession and the long-term stability of the solar system — mentioned by raattgift

Thu, 16 Mar 2023 00:09:52 GMT

Please forgive what I suspect is something of a rant. I'm not comfortable with the wording "strengthened GR" because there's an implicit assumption that one can straightforwardly map the authors' time-dependent parameter on the perihelion procession (their eqs (1), (2), and (3) in <https://arxiv.org/abs/2303.05567>) into a relativistic theory at all. The experience of various alternatives to GR (and in particular MONDian alternatives) suggests that assumption may be a bad one. What they are doing is essentially exploring a family of theories of gravitation (which may or may not solve the…

Paper and discussion history. A mention is not an endorsement.

General relativistic precession and the long-term stability of the solar system — mentioned by raattgift

Wed, 15 Mar 2023 23:41:43 GMT

> nothing special about special relativity What's special about special relativity is that the spacetime is flat, i.e., there is no gravitation at all. This work is about the sun's gravity, i.e. the (weakly) curved spacetime sourced by the central mass of our solar system, and so is about general relativity and not special relativity. > change any of the underlying rules, it's going to become stable The relevant thing here is chaos. [italicizations below are mine] §3.1 in the authors' preprint at <https://arxiv.org/abs/2303.05567> makes the point: "because the systems are chaotic and we use…

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General relativistic precession and the long-term stability of the solar system — mentioned by raattgift

Wed, 15 Mar 2023 22:14:48 GMT

> in general That's too broad to answer. Let's narrow to our solar system, or a close approximation, first. Below, I'll step up to more complicated arrangements, and binary black holes. These are only three or four families of (regions of) general curved spacetime; there is a very large infinity of other families one could reasonably associate with "in general". In a (model) solar system, there is a large central mass and several other objects with extreme mass ratios to the sun. There are interesting secular resonances among Mercury, Venus, and Jupiter, and between Earth and Mars, where that…

Paper and discussion history. A mention is not an endorsement.