Important. and expiration. This is how we breathe. that we live. And if so for the universe. What if we live in the heart of someone’s demise? He can, in the future, begin to inspire. Until it “explodes”…in a new BIG EXPLOSION!
I’beingbeing He was born in a state of extreme intensity and heat. In a kind of big bang, big bang. This is the story scientists tell us. It achieves consensus. But what do we expect from the end of this story? affiliate University of Portsmouth physicists (USA) proposes today that it can never happen!
Remember, our universe is currently expanding. He’s getting older. A little faster every moment, too. Contrary to what we should expect from the effect gravitygravity. Cosmologists say that a mysterious dark energy will hide behind this phenomenon. Will you do this until the universe ends up cold and empty, in what scientists call the “Big Freeze”? Or will something reverse the expansion, shrinking it again until a “great crisis”?
Dark work for dark energy
the PhysicistsPhysicists The Americans offer an alternative. It emerged when it sought to understand whether dark energy always played a role in the universe. If we owe it the period of insane initial inflation it went through and the current acceleration of its expansion. In this case, they argue, the problem posed to cosmologists by the Big Bang and its infinite density could simply be eliminated.
So this is the solution that physicists have found. To avoid the Big Bang singularity, to forget the concept of infinite density, we must live in the heart of a series of “big bounces”. They are in a universe that bounces—or breathes, for most of the poets among us—under the influence dark energydark energy which turns on and off periodically. It makes the universe grow sometimes and sometimes shrink. And regularly give rise to new large eruptions. All this provided that both matter and radiation do not exist in the first moments after each of them. Both finally appear in this story only after the initial stages of inflation, after part of the dark energy has disintegrated.
Has our universe experienced several Big Bangs?
What if our universe is much older than we thought? If it is in an endless cycle and experiences a new Big Bang every trillion years? So according to a study published today in the journal scienceproblem cosmological constantcosmological constant will solve…
Article by Christophe Ulry published on 05/05/2006
Being in an infinite loop?
According to Paul Steinhardt and Neil Turok, respectively from Princeton Universities in New Jersey and Cambridge in England, The universe we know today is at the center of a trillion-year cycle, forming part of a cycle during which the Big Bang and the Big Crunch follow one another. ” Since the 1960s, the Big Bang has been thought to be the starting point because the laws physicalphysical get hurt there Turok says. But, according to him, the equationsequations affiliate string theorystring theory Allowing time to exist before the Big Bang…
If this periodic model developed by Paul Steinhardt and Neil Turok is interesting, it is above all because it provides an original solution to the cosmological constant problem.
The cosmological constant paradox
Considering that the universe was still, Albert EinsteinEinstein Incorporate the cosmological constant into his equations in order to balance the expansion of the universe. Thus, two opposing forces may act on the original expansion produced by the big bang : On the one hand gravitygravitytend to slow it down, on the other hand, the cosmological constant acts as a driving force.
In 1996, the scientific community discovered that the expansion of the universe is accelerating. The cosmological constant, which describes the repulsive force, seems to be the best explanation for this acceleration. However, its value is measured in CosmologyCosmology was 10120 times less than predicted by particle physics.
Why this discrepancy? In the 1980s, researchers assumed that The cosmological constant may have decreased over time, from the value predicted by particle physics to the value we know today. But additional work has shown that, in this case, the constant should have been declining for a period of more than 14 billion years. It is simply unimaginable, given the age of our universe, which is estimated at about 14 billion years!
“Stable” slowly decreasing more and more!
Paul Steinhardt and Neil Turok posit that the universe is trapped in an infinite loop and that with each new Big Bang, the counters of ThemeTheme The radiation is reset while the value of the cosmological constant remains. This decreases during cycles by undergoing successive quantum transformations. Physicists’ calculations show that the higher the value of the constant, the faster these transitions, while the lower it is, the slower they vary. Thus we are in a period when the cosmological constant is very weak and it takes a long time to change it.
Of course, opinions about this cyclic model are divided. But the authors of the article published today in the journal science I think their concept is verifiable. On the one hand, it predicts that the big bang sent gravitational waves into space. On the other hand, the decrease in vacuum energy calls for a new type of fundamental particle called axions, which must be detectable.
At first glance, such an explanation of the cosmological constant paradox might seem a bit extreme. But, as Sean Carroll of the University of Chicago points out, less extreme solutions have already been considered and rejected…
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