Work by Frédéric Baudemont
Computer Scientist
frederic.baudemont
club-internet.fr
April 10, 2004
FFrédéric worked on programming Newtonian interaction on a sphere S2, Newtonian and "anti-Newtonian" laws based on curvilinear (geodesic) distance.
The galaxy: 10,000 point masses. The "twin matter": a few large point masses (yellow) distributed throughout the rest of space. The "dynamic friction" between the two subsystems has yielded these first promising results, which merely confirm what we had obtained with Frédéric Landsheat back in 1992. All of this is but a pale beginning. Frédéric could, with a galaxy of 10,000 point masses, move to "two populations" and already achieve a more realistic simulation, albeit in 2D. Suggestion: 90% of the galaxy's mass in the form of a cluster-like subsystem, but without rotation (equivalent to Population I stars, the oldest). 10% of the mass (but 90% of the points) representing interstellar gas and Population II stars (younger). Never done before, anywhere.
SAccording to the fundamental principles of the Epistémontron project, this is entirely "wild" research. Therefore, systematic and immediate dissemination of software developed by participants, including source code (which we will do, Agostini and I). And we intend to give this project a global reach. Welcome to the club. Jump on this train that departs like an express—join a new adventure:
astrophysics @ home
: Astrophysics west of the Pecos
RRemember that:
"Astrophysics is too serious a science to be left in the hands of astrophysicists" (Poincaré)
To view the results of Frédéric Baudemont's work, October 25, 2004:
http://perso.club-internet.fr/frederic.baudemont/Galaxie5000.avi
NNote the stability and regularity of the spiral structure—never achieved before. It should also be noted that Baudemont maintains a spiral structure, whereas Descamp and I, in 1992, obtained a barred spiral. There may be something significant here to understand and clarify. But I must admit that the untimely intervention of a 25-year-old Canadian, even a rather bright one, completely disrupted this dynamic a few months ago. Given the difficulties each of us was facing (health for some, work or financial problems for others), we certainly didn’t need such interference. We had told ourselves, "Galaxies can wait." I sometimes use the term "untimely." An untimely individual is someone who intrudes into a project, destroying everything through greed or stupidity. Unfortunately, I’ve experienced such misfortunes too often in my career.
CThat said, Baudemont’s remarkable work remains. He has recently produced, in quick succession at the end of October 2004, two highly interesting animations. One shows the formation of a galaxy interacting with an environment of twin matter, with the yellow points seen dispersing around it. The matter then responds via "dynamic friction," producing a very beautiful and remarkably stable spiral structure, apparently spanning six turns. It would be interesting to know whether this structure can persist over a greater number of turns. Our galaxy has completed roughly 70–80 turns since its formation. That said, a galaxy is not a system built from a single population of point masses, and furthermore, this simulation is in 2D.
November 2, 2004
: Baudemont sends me a second AVI file showing quite clearly gravitational instability—or Jeans instability—in action within a 2D population of point masses uniformly distributed in space.
2D Gravitational Instability with a Single Population
(1.5 MB)
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