The accelerating expansion of the observable universe cannot be denied, but it is not yet clear why. If dark energy is, then determining its nature is one of the greatest challenges in modern astrophysics. To meet this challenge, researchers are enlisting the help of artificial intelligence as part of the Universe Observing and Mapping Program that plans to observe about 35 million galaxies over billions of years.
Since the end of the 1990s, we’ve known that For a few billion years while the cosmic model in place before the turn of the millennium indicated that this expansion had slowed down for about 13 to 14 billion years. Among the hypotheses put forward to calculate this acceleration is expressed in Dr’ From a domain By having a term called , There is one where this term expresses the existence of energy density Baptized (Einstein’s constant may not be zero without it But simply assuming that the observable universe cannot really be treated as homogeneous on a large enough scale as one could do with water, even though it is made up of ).It can be seen at
Nobody really knows what the origin of dark energy is. Two main theories are generally considered, one And that the existence of a new particle field is analogous to a field By Brout-Englert-Higgs. Unlike the first theory, where dark energy cannot change in time or space because it is a manifestation of quantum fluctuations in the domains under the control of the famous. , The energy density of this new field, is called the intrinsic field in memory , It may differ in space and time.
How do you reveal the secrets of dark energy? For a fairly accurate French translation, click on the white rectangle in the lower right. English translation should appear after that. Then click on the nut to the right of the rectangle, then click on “Subtitles” and finally on “Automatically translate”. Choose “French”. © Berkeley Lab
Dark energy is the key to the fate of the universe?
If so, We will not know it until we know the exact nature of the essence. In fact, from being disgusting and thus accelerating expansion, it can become attractive and cause a definable future. Of the visible universe that might (again?) Lead to .
To test all of these hypotheses, it is imperative to be able to measure values ), Led by the University of California at Berkeley which has 600 researchers, including researchers from CEA-Irfu, who are heavily involved on various levels.The visible universe has expanded and that is what And cosmologists to undertake many projects including the international mission (Desi).
CEA just announced, Across a On May 17, 2021 Four meters from Desi installed at Kitt Peak in Arizona has begun his search for dark energy secrets and that the data he will gather about About 35 million On the heavenly vault it was to be studied with help (he is).
The Desi dark energy spectroscopy instrument (Irfu, CEA) saw its ‘first light’ some time ago. It would allow researchers to question the evolution of the universe and confront it with the reality of the standard model of cosmology. The latter posits the existence of an unknown and never directly observed element that researchers call “dark energy.” Explanations. © CEA Sciences
These 35 million galaxies were selected from 200,000 images taken from 1,405 nights of observations of the celestial vault and from a population of nearly two billion objects. Obviously, the mission required the help of an artificial intelligence that worked on the basis of criteria that would allow it to go in search of galaxies that have classified them into four types that correspond to different eras in the history of the observable universe, between 12 and 4 billion years. Ago.
Expansion acceleration was measured with an error of less than 1%.
The main goal is to measure an accuracy of less than 1% the variation over time in the velocity of the observed universe expansion, a variation dependent on nature Out of every 35 million galaxies to merge in particular with the way in which these galaxies are distributed in three-dimensional form The observed space, and therefore just under 10 billion years.The reason for the recent acceleration of this expansion. One of the ingredients for achieving this is assumed
To do this, Desi will automatically and successively obtain the extensionFrom 5000 On the screen are images of these galaxies. Each fiber connected to a galaxy, it will transmit the received light in one direction of the 10 Equip the telescope.
The mission is expected to last about five years, and thus millions of spectra collected using algorithms fromLike those used in detectors To identify and quantify rare events in collision deluge .
So we can hope that in a few years, thanks to artificial intelligence, we will learn more about the nature of dark energy and possibly the origin and fate of the universe.