In the new article published in PNAS, three scientists try to create a model about the nature of dark energy - a mysterious entity that seems to cause the universe to expand faster and faster, in line with previous observations of the expansion of the universe but with a different prediction for its future
After nearly 13.8 billion years of nonstop expansion, the universe may soon stop and then slowly begin to contract, according to a new study published in the journal Proceedings of the National Academy of Sciences.
In the new article, three scientists, two of them from Princeton and the third from New York University, try to create a model about the nature of dark energy - a mysterious entity that seems to cause the universe to expand faster and faster, in line with previous observations of the expansion of the universe but with a different future.
In the team's model, dark energy is not constant, but an entity called quintessence, which can fade over time.
The researchers found that although the expansion of the universe has been accelerating for billions of years, the repulsive power of dark energy may be weakening.
According to their model, the acceleration of the universe could end rapidly in the next 65 million years—and then, within 100 million years, the universe might stop expanding altogether and instead enter an era of slow contraction that would end in billions of years in the death—or perhaps rebirth—of time and space. .
And it can happen "really" fast, said study co-author Paul Steinhart, director of the Princeton Center for Theoretical Sciences at Princeton University in New Jersey.
"If we go back in time 65 million years, then the Chikshulov asteroid hit the Earth and wiped out the dinosaurs," said Steinhart. "On a cosmic scale, 65 million years is really short."
There is nothing controversial or implausible about this theory, said Gary Hinshaw, a professor of physics and astronomy at the University of British Columbia, who was not involved in the research.
However, because the model depends only on previous observations of the expansion - and because the current state of dark energy in the universe is so mysterious - it is currently impossible to test the predictions in this paper. In the meantime, they can only remain speculations.
Since the nineties, scientists have realized that the expansion of the universe is accelerating - the space between the galaxies is now expanding faster than it did billions of years ago.
The scientists called the mysterious source of this acceleration dark energy - an invisible entity that seems to work against gravity, separating the most massive objects in the universe instead of pulling them together.
Although dark energy makes up about 70 percent of the total mass-energy of the universe, its properties are still a complete mystery.
A popular theory put forth by Albert Einstein is that dark energy is a cosmological constant—a form of unchanging energy woven into the fabric of space-time. If this is so, and the force exerted by dark energy can never change, then the universe will continue to expand (and accelerate) forever.
However, a competing theory claims that dark energy does not need to be constant to match previous observations of the expansion of the universe.
The dark energy could be something called quintessence - a dynamic field that changes over time. Unlike the cosmological constant, quintessence can repel or attract, depending on the ratio of its kinetic energy to potential energy at a given time. For the past 14 billion years, the quintessence has been declining.
More of the topic in Hayadan:
- Dark energy: a map hints at what it is - but deepens the dispute over the expansion rate of the universe
- Dark matter, dark energy and the fate of the universe - a chapter from the new book "Journey to the Dawn of the Universe"
- Einstein's big screw up? It is possible that dark energy corresponds to the cosmological constant
- Dark matter and dark energy are sharp?
21 תגובות
Idiots, what's interesting now?
I don't care if the universe will shrink in a few billion years. Do you have a more interesting forecast for just how many decades I have left to live?
Get angry, stop marketing your nonsense, this is a scientific site, not for crazy people.
Miracles, you're missing out on all the action, the cap kid is outdoing himself.
https://www.hayadan.org.il/%d7%a8%d7%a9%d7%99%d7%9e%d7%aa-%d7%94%d7%9e%d7%a9%d7%90%d7%9c%d7%95%d7%aa-%d7%a9%d7%9c-%d7%94%d7%90%d7%a1%d7%98%d7%a8%d7%95%d7%a0%d7%95%d7%9e%d7%99%d7%94-%d7%9c%d7%a2%d7%a9%d7%a8-%d7%94%d7%a9%d7%a0#comment-779840
I have an explanation for the "dark energy" that expands the universe. The whole universe is immersed in a great bath of forces. of energy. Electromagnetic rays of all wavelengths, gravity waves, shock waves. All this energy tends to spread and drag the entire universe with it. Its very presence causes the universe to expand. This is actually the "dark energy".
Maximum life expectancy for a person is around 120 years... How will I know that you are not scheming?!
The comments here - all of them - are a shame and disgrace
What is a universe?
http://img2.timg.co.il/forums/3/c8659042-cdd9-4060-b7fd-a3872d542a4b.pdf
1) Clearly unlikely, why exactly when the galaxies are far from each other and the gravitational forces in them are so small as to be negligible and according to the expansion model of the universe only getting smaller and smaller only then will the dark energy run out?
If we liken it to throwing a ball in the air until it reaches a peak and then falls, then the acceleration is negative, which contradicts the premise that acceleration is positive and *opposite* to gravity.
In addition, if there is a force opposite to the force of gravity, then we would not detect the force of gravity in the first place, we would detect a force of repulsion instead.
Why would galaxies move away but everything else move closer?
There is no difference between them.
A much more plausible model is a model according to which there was an initial force and that the galaxies are moving away from each other due to the force of inertia and that their velocity converges to 0 from above because the further they move away, the smaller the force on them.
Of course, this theory is also clearly improbable since it requires an initial movement that is much higher than the speed of light.
The theory according to which the space itself expands, according to this theory the space should be continuous and not discrete.
In any case, if all the matter in the universe was in a single point (or at least in a certain area), then according to the second law of thermodynamics, the heat level in the entire universe should have been exactly the same.
Yes. And the earth sits on an elephant that sits on a turtle that sits on a crocodile.
Good luck to us with Vibe.
What are the chances that the universe contracted precisely "when" we discovered that it could?
What are the chances that the universe contracted precisely "when" we discovered that it could?
In the meantime, only common sense shrinks and slips between the hands in such a generation, let's hope that the brain explodes, the brains of the government are running out and really on our fate, it's a shame if we don't unite, we will become extinct and this will forever echo in our ears
😘💥
The universe has no age and has always existed in cycles of contraction and expansion that last billions of years.
When I say soon, I mean neither this week nor next week in a few million years that even our bones have resonated
Your mind will shrink soon
The universe works like a yo-yo. When he reaches the bottom he goes back up, and God forbid. Now imagine that during the so-called "big bang" there were many yo-yo's, some of them the rubber broke and then they fall. And that's what happens with black holes. The yoyo whose rubber was torn was swallowed by the black hole.
The theory is simple physics...
A vacuum was created in the center of the explosion...
And when the vacuum is stronger than the sum of the parts of the explosion, it will shrink back...
That is to say that the universe is a game of billions of years of explosion, expansion and return to the zero point that will bring another explosion...
You don't have to be a scientist to understand...
I have a theory based on an idea that exists in nature
What if the universe is a dynamic entity and instead of it contracting completely or expanding without limit the universe beats like an animal's heart contracting and expanding every 500 years
After all, there is no proof that the universe started from a point a few billion years ago
Everything is based on an assumption
Because in the last hundred and fifty years we see the expansion of the universe
We assume that it started from a starting point of zero or in the parlance of science
singular point
But what if there is such an energy
"Entity" as the language of the article causes the contraction and expansion of the universe
How beautiful the universe is shrinking so whoever is fat will be thin
Comrade, eat full
In the end we will shrink
Really great...
Create the world I want to go down.
Buy me a ticket to the nearest galaxy, make sure there are suitable conditions.
If the whole universe is going to shrink, does that include my bank deficit?