After nearly 13.8 billion years of continuous expansion, the universe could immediately stop, then slowly begin to shrink, according to new research published in the journal Science. Proceedings of the National Academy of Sciences This suggests. In a new paper, three scientists attempt to model the dark energy realm. A mysterious force that appears to be causing the universe to expand faster based on previous observations of cosmic expansion. In the team model, the dark energy is not an unchangeable force of nature, but an entity called Essence, which can disintegrate over time. Researchers have found that although the expansion of the universe has accelerated over billions of years, the repulsion of dark energy may be weakening. According to their model, the acceleration of the universe could end quickly in the next 65 million years then in 100 million years the universe could stop completely, and instead could enter an era of slow contraction that ends billions of years from now with death or perhaps a rebirth of time and place. . All of this could happen "unbelievably" quickly, said study co-author Paul Steinhardt, director of the Princeton Center for Theoretical Science at Princeton University in New Jersey.
“Back in time 65 million years ago Asteroid Chicxulub Hit the ground and get rid of the dinosaurs Steinhardt for Live Science. On a cosmic scale 65 million years is very short. "
Nothing about this theory is controversial or implausible, Gary Henshaw, a professor of physics and astronomy at the University of British Columbia who was not involved in the study, told Live Science. However, because the model relies on observations of previous expansion alone – and because the current nature of dark energy in the universe is a mystery – it is currently impossible to test the predictions in this paper. For now, they could only stick to theory.
Vacuum Energy
Since 1990 scientists have recognized that the expansion of the universe is accelerating; The distance between galaxies is expanding faster now than it was billions of years ago. Scientists have dubbed this mysterious source of accelerating dark energy an invisible entity that appears to work in reverse gravity pushing the largest objects in the universe away from each other rather than clumping together. Although dark energy makes up nearly 70 percent of the total energy of the universe, its properties remain a total mystery. The popular theory, presented by Albert Einstein is whether this cosmic constant dark energy is a form of constant energy woven into the fabric of leisure. If so and the force exerted by dark energy could never change then the universe would have to continue expanding (and accelerating) forever. However, competing theories suggest that dark energy need not be constant to accommodate previous observations of cosmic expansion. Or, dark energy might be something called a nucleus – a dynamic field that changes over time. (Steinhardt was one of three scientists who proposed the idea in a 1998 paper published in the journal Physical Review Letters.) In contrast to the cosmological constant, an essence can either repel or attract, depending on the ratio of its kinetic energy to its potential energy at any given time. . Over the past 14 billion years, his essence was repulsive. For most of that period radiation and matter contributed insignificantly to the expansion of the universe. That changed about five billion years ago, when the nucleus became the dominant component and the effects of gravitational repulsion accelerated the expansion of the universe. "The question we ask in this paper is, should this acceleration continue forever?" said Steinhardt.
“And if not, what are the alternatives, and when will things change soon?”
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