Re: OT: alien radio signals

On 27/11/2024 12:54, Liz Tuddenham wrote:

Bill Sloman <bill.sloman@ieee.org> wrote:
 

On 27/11/2024 6:58 pm, Jan Panteltje wrote:

A 2.9 hr Periodic Radio Transient with an Optical Counterpart:
   https://iopscience.iop.org/article/10.3847/2041-8213/ad890e
>
No good movies and music yet...(decoded that is)
But at least technical details such as frequency etc..
Some very peculiar.

>
A close-orbiting pair of white dwarf stars could be doing lots of
peculiar stuff, without any help from aliens.

 Would a cluster of three or more be stable?  If so:
 Dit-dit-dit dah
Dit-dit-dit dah
Dit-dit-dit dah
 or even:
dah-dit-dah-dit     dah-dah-dit-dah

3 body problem remains unsolved and probably insoluble analytically apart from a special case of fairly massive stars in mutual orbit and a small mass at one of the two stable L4, L5 Lagrange points like the Trojan asteroids locked in equilateral triangles with Jupiter and the sun.
https://en.wikipedia.org/wiki/Lagrange_point#Stability
Ultimately in the very long term it is thought that for three (or more) bodies in general three of them will get close enough together at some point that the smallest one gets expelled and the others will end up more tightly bound together. Ovenden's conjecture also AFAIK still unproven is that the gravitational dynamics will perturb their orbits in such a way as to put off the evil day for as long as possible.
I can't find anything suitable online but it seemed like a very reasonable way to explain Bode's law from first principles and the same locked resonance patterns seen in other planetary moons. This is the closest I've been able to dig up. Ovenden's conjecture gets and honourable mention in A.E. Roy's 1970's book "Orbital Motion".
This comes closest:
https://academic.oup.com/mnras/article/115/3/296/2603818
--
Martin Brown