Time cannot be reversed, but in the eyes of physicists, the arrow of time does not have only one direction, in some special cases, time will start flowing backwards.
Modern cosmological models believe that our universe was born from a big bang 13.82 billion years ago, before there was no time, space, matter, physical laws, or all the stay.
In a very short time after the big bang, the universe exploded from an invisible point on a remarkable scale, this speed of expansion exceeds the speed of light, and in the current expansion of the universe, the rate of space-time expansion is also faster than the speed of light.
The arrow of time is a concept that describes the sequence of events from the past, present and future – this sequence cannot be reversed in the world as we know it. However, most laws of physics do not distinguish between the future and the past. For example, make an equation describing the collision and rebound of two identical billiard balls. If a close-up of this event were captured with a camera and played back, it could still be expressed by the same equation.
This is why distant galaxies are faster than Earth’s speed of light and why the observable universe is 93 billion light-years across.
Under the direction of the idea of spatio-temporal integration According to Einstein, many physicists believe that the current one-dimensionality of time is caused by the expansion of the universe, which means that once the universe goes from expansion to contraction, the direction of the universe will change, the arrow of time will also be reversed.
Researchers have found that although the expansion of the universe has been accelerating for billions of years, the repulsion of dark energy may be diminishing.
The currently observed universe is in a state of accelerated expansion. This is because, which accounts for 70% of the total mass and energy of the universe, is active. It provides extra thrust and helps the universe to expand faster.
If future physicists find out that the ratio of dark energy is overestimated or the dark energy is exhausted, the whole universe will go from accelerating expansion to decelerating expansion, then stop expanding, the universe will end by passing from a stable state to a state of collapse or contraction.
Inspired by a new study published in the journal Proceedings of the National Academy of Sciences, acceleration of the universe could quickly end in the next 65 million years – then, in 100 million years, the universe could stop expanding altogether, and instead it could enter an era of contraction, possibly of death or rebirth, the inverse of time and space. However, experimental evidence (observations of supernovae taken as a landmark or cosmic microwave background) suggests that Don’t slow down but speed up. A large number of astronomers have recognized the experimental results of the accelerating universe since 2002.
If a big crash occurs at some point in the future, it will not only shorten the distance in space, but also reverse time, and then the distance between the galaxies will get closer and closer. So, if there really are a large number of advanced intelligent civilizations in the universe, then human civilization will soon discover their existence in the ever-smaller universe.
The Big Crunch is a future cosmological prediction of the convergence of the universe to a point after it has stopped expanding after the Big Bang. If the gravitational pull of all matter in the observable universe is great enough, it could slow the expansion of the universe, to the point of stopping completely and then starting to contract again. After a time roughly equal to the expansion time, the universe shrinks to a singularity, similar to a giant black hole containing all matter. Nothing can be said about what will happen after the Grand Col, because time stops at this singularity.
As ordinary people, we can actually treat the collapse of the universe as a reverse movie, but there is still a fundamental difference between the collapse of the universe itself and the reverse movie, that is- to say entropy.
In thermodynamics, entropy refers to the degree of chaos in a closed system, its main property is that it will only increase, not decrease, which means the degree of chaos in a closed system will only increase .
In case our universe is a large closed system, the entry value of the universe will continue to increase and the expansion of space and time, but when the collapse of the universe begins, the value of the universe will continue to increase. will not reverse, but will continue to increase.
Although time reversal may seem unbelievable to many, it is indeed possible, albeit with very low probability.
Article source: PNVN
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Time cannot be reversed, but in the eyes of physicists, the arrow of time has more than one direction. In some special cases, the weather…
