For 20 years of Futura, it is interesting to point out some fascinating lessons in astronomical physics, which still raises many questions. Antiquity is a dark thing that has haunted us for decades.
Takes the latest heated discussions Intense localization called UDG (Ultra-diffuse galaxies) They are large galaxies, but their mass Is . Their surface density is very low, and the theory predicts that they will dominate . On the other hand, interacting with some very large galaxies is not true.
Is this a problem of measurement, of interpretation? Or they are not in balance yet because they are disturbed? These galaxies are experiments for alternative theories to dark matter.
Another area where progress has been rapid in recent years ) Duncan Lorimer and his collaborators, in 2007, published their discovery, and, for many years, FRBs were so mysterious that they did not repeat themselves; Couldn’t figure out which one Were responsible for it. Over the past decade, more and more FRBs, some in the Milky Way, have discovered it again and again , And especially objects Serious, The ., Or FRB (
Presentation of Professor Francois Comps’ 2016-2017 Course: “Models of Dark Energy and the Universe”. College of France
Intriguing and paradoxical accelerated expansion of the cosmos
The Has a turbulent history. Discovered in 1929 with measurements Distance obtained by the law of the recently discovered time-luminosity relationship of the Vesto Slipper galaxies , By , In 1909. This first relationship between the distance and velocity of galaxies is a law proportional to a constant H. Is approximately 10 times the constant known today. Father Lomotre was the first to realize that it was not really a question But a Location, provided d ‘ From 1915. Going into time, he baptizes the primitive universe It is the oldest With Fred Hoyle in 1949.
This famous constant is a lot different during XXe For centuries, the distances of galaxies have not been well known. It varies between 50 and 100 km / h / mb, which has a major impact on the age of the universe: plus H Large, small age of the universe.
Some stars are older than the universe!
For almost 20 years, all observations (with cosmological background), , , SNIa, etc.), agreed to establish an integration model of the universe, 30% material, 70% , And a standard h = 70 km / v / MBC. In recent years, however, a tension has developed between the H value Measured locally (cefits and other standard candles) and subtracted from LCDM, with the physics of the Adi universe: h= 73 on one side and 66 km / h / MBC on the other.
The place to find is still huge …
For 13.7 billion years, the universe has not stopped forming. Contrary to what our eyes tell us when we think of the sky, what it contains is not static. Physicists make observations and simulations at different ages in the universe in which they re-direct its formation and evolution. It seems that dark matter has played a major role in the formation of the great structures seen today from the beginning of the universe. CEA Research
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