Physical cosmology, astrophysics galaxy

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October 2000 :

...Those who regularly visit this site, and there are many, probably expect all kinds of new things. For several months I have been very busy with various scientific projects. This even prevented me from advancing the comic strip on groups, which some are waiting for. Regarding this, who has a title for such a comic?

...As usual, when things take shape, I will report on them in the site. But, in advance, some images. Those who have read my books know that in the early 1990s, a certain Frédéric (who preferred to remain anonymous) had carried out computer simulations where the spiral structure of a galaxy was attributed to the interaction between our universe and its twin, between a galaxy and its "conjugated" image, located in the twin universe. Read about it this article recorded on the site. The work in question dates from 1992. Later, Fred having left the DAISY laboratory in Hamburg, where he had managed to divert 10% of the computing power of the computer managing the particle accelerator to perform these simulations, and no longer having adequate means in his new lab, the work had been stopped. They have recently resumed a few months ago. I have two very active and efficient "students", Pierre Miret and Pierre Davous, who are in Paris. The first is 68 years old and the second 74 (I am myself 63). It turns out, as Fred had told me, that the power of some microcomputers accessible to the general public (mainly ...Mac) makes it possible that calculations that could only be done eight years ago on large systems are now within the reach of much more modest machines. When they contacted me at the end of 99, Miret and Davous had simulated the structure of M51, the galaxy of the dogs, using 5000 mass points for the galaxy and 200 for the perturbing companion. Everything worked very well and these two "amateurs" had reproduced the work that was considered cutting-edge only fifteen years ago. Encouraged by this result, they had then contacted six astrophysicists, offering their services. None responded. I was the seventh and I immediately connected them to the problems we had addressed, Fred and I, eight years earlier. Thanks to Davous' programming skills (in C) and Miret's tenacity, here are the first images that are coming out. They are really nice.

...Moreover, we were able to reconstruct a sequence showing the birth of a galaxy. A first. But I will leave the surprise to you. It's getting a bit late.

- In the math section: how to transform a left Boy surface and a right Boy surface, passing through the Steiner Roman surface.

- On the homepage: the central model of the Cube Turnover.

- See also the monodromy: a polyhedron that has only one face and one edge.

- Although it is not new work (I abandoned MHD in 87), the reader will find elements that may interest him in this new section. I had long planned to talk about this field, which I know well, on my site.

- Our current work focuses on replacing the black hole model, which is plagued with serious mathematical inconsistencies, with that of the hyperspatial transfer of matter from a destabilized neutron star, via a "hypertoroidal bridge" connecting two universes, ours and its "twin", a model in draft. However, the reader will find a critical analysis of the black hole model. See the introduction in French of the questionable black hole paper.

** -** Also see the new axiomatization of groups, by Souriau.

** - **Publishing in peer-reviewed journals is painful. However, last publication:

J.P.Petit and P.Midy
Scale Invariant Cosmology
The Intern. Jr of Mod. Phys. D Vol.8 june 1999 pp. 271-280

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