What is beyond the limits of the observable universe? Is it possible that our universe is part of a much larger multiverse?
Movies never tire of exploring these questions. Whether through superhero blockbusters Dr. Strange in Madness’s Multiverse Or like an independent movie Everything Everywhere All at Everything, Science fiction has alternative realities. And for some cosmologists, the concept of multiverse can be more than just a myth or a screenplay tool, admittedly very real.
Humanity has long imagined alternative realities: in 1848, Edgar Allan Poe even wrote a prose poem in which he imagined the existence of a “boundless legacy of the universe.” But the concept of multiverse really gains momentum when modern scientific theories try to explain the features of our universe that have theorized about the existence of other universes beyond our reality where events will take place.
“Our perception of reality is not complete,” said Andrei Linde, a physicist at Stanford University. “The reality is that we exist independently. A
If they exist, then these universes are separate from us, inaccessible and cannot be detected by any direct measure (at least until now). Some experts therefore wonder if the discovery of multiverse can really be scientific.
Will scientists ever know if our universe is unique? We have analyzed various theories about possible multiverse – other universes with their own physical laws – and tried to answer the following question: Is it possible that our other versions exist in other realities?
What is a multiverse?
The term multiverse is used by scientists to describe the idea that there could be other universes besides the observable universe. Scientific theories predict multiverse versions of bubble universes that are separate from us and that are constantly evolving, starting from the angles of space in other plains of our universe from the angles of various possible situations.
All these theories have one thing in common: they suggest that the space and time we know is not the only reality.
But why do scientists think there can be more than one universe?
“We cannot explain every feature of our universe if there is only one,” says science journalist Tom Siegfried, whose book The number of heavens Investigates how the design of multiverse has evolved over millennia.
“Why are nature’s fundamental constants? Siegfried asks.” Why do we have enough time to create stars and planets in our universe? Why do they use exactly the amount of energy they need to shine the way they do? All of these issues are questions for which we have no answers in our physical theories. A
According to Siegfried, two explanations are possible. The first is that we need new and better theories to explain the features of our universe. The second, on the other hand, says that it is possible that “we are the only one in many different universes and we live in one of bliss and comfort.”
What are the most popular theories about multiverse?
Perhaps the most widely accepted concept by the scientific community is the theory of cosmic inflation: in the very few moments after the Big Bang, the universe will experience a phase of rapid and indicative expansion. Cosmic inflation explains many observational features of the universe, such as its structure and the distribution of galaxies.
“At first, this theory sounded like a snippet of science fiction, although it is very imaginative,” said Linde, an architect of the cosmological inflation theory. “But he explained so many interesting features of our world that people began to take him seriously.”
One of the predictions of this theory is that inflation can happen again and again, possibly with infinite advertising, creating a constellation of bubble universes. These bubbles may not have the same properties as ours: they may be places where physics works differently. Some of them may be similar to our universe, but they all exist outside of what we can observe directly.
What are the other ways?
Another interesting type of multiverse is the multi-world theory of quantum mechanics (Multi-world In English), which describes the behavior of matter through mathematics. Proposed by physicist Hugh Everett in 1957, the multi-world interpretation branch theorizes the existence of timelines or alternative realities where the results of our decisions are different, and therefore sometimes very different.
“Hugh Everett tells us that there are actually an infinite number of parallel Earths, and when you do an experiment and you get the probability, it proves that we live on Earth where the results of this experiment were,” said physicist James Cacalios of the University of Minnesota, who is a superhero physicist. Wrote about. “But in other worlds, the results are different.”
According to this explanation, our other versions could have many alternative lifestyles that we could have managed if we had made different decisions. But the only reality we can realize is where we live.
So where is all this other land?
These overlap with all the dimensions that we cannot access. Max Tagmark of the Massachusetts Institute of Technology (MIT) calls this type of multiverse a Tier 3 multiverse, where multiple scenarios are seen in branching reality.
“In many parts of the world, we still have an atomic bomb, but we don’t know exactly when it will explode,” Linde explained. And maybe some of this reality, it won’t explode.
In contrast, multiple universes predicted by some theories of cosmic inflation are called Tagmark Level 2 Multiverse. Within these multiverse, the basic physics may vary depending on the universe. For Lind, in the multiverse of inflation, “it is also not known whether, in some parts of the universe, the atomic bomb is possible in principle.”