The concept of multiple universes goes back to the 6th century, when pre-Socratic Greek philosopherAnaximandersuggested the idea of infinite worlds for the first time.
Yet multiverse ideas gained scientific weight only in the 1980s, together with the inflation theory, which not only explained why the cosmos is so flat and smooth, but also predicted an endless creation of new ‘bubble’ kinds of universes.
And now, it seems thatscientistsare finally closer than ever to finding the evidence that could prove the multiverse’s existence.
A hundred years on from Edwin Hubble’s proof that other galaxies are out there, we might soon find proof of the multiverse’s existence
Image credits:ESA Hubble
Image credits:ESA
Inflation is also part of the current known model of the universe, called the Lambda Cold Dark Matter (LCDM), in which the shape of the universe’s trajectory reminds a funnel which is growing and spreading further out over time.
At the heart of this cosmological inflation there’s an idea of ‘bubbles’ – endless unique universes which were created when some parts of space-time expanded faster than others.
A Russian-American theoretical physicist, Andrei Dmitriyevich Linde, later on noticed that the exponentially rapid expansion of the universe could appear not only in the false vacuum, but also during a slow transition away from the false vacuum. Therefore, in 1983, he suggested another version of inflationary theory – chaotic inflation. The physicist in hisstudyexplained the inflation as a natural (and may be even inevitable) consequence of chaotic initial conditions in the early universe.
While multiverse ideas gained scientific weight in the 1980s with the proposal of inflation, nowadays scientists are looking for alternative ideas
Image credits:NASA
Therefore, in recent years, many cosmologists have been searching for the alternatives that could finally reveal the story of our universe’shistory. One of such could be the cyclic universe theory, which states that the universe forms itself again and again in cycles.
“What I didn’t like about inflation was that there are very few genuine predictions – you don’t get out much more than you put in. It just struck me that there has to be a better explanation,” said Neil Turok, a physicist at the University of Edinburgh, UK.
Scientists who proposed the cyclic model are suggesting that the Big Bang was not the beginning of time. They believe that there was another phase leading up to it, which has multiple cycles of contraction and expansion that repeat indefinitely.
“It allows us to go beyond the Big Bang, but without any kind of magicalphilosophical issues, because time has always existed in the past,” shared Stephon Alexander, a professor of physics at Brown University, and the co-inventor of an inflation model of the universe based on string theory.
As another concept that doesn’t invoke cosmic inflation, in 2018, physicist Neil Turok proposed a mirror universe – one that is stretching backwards in time from the Big Bang.
While the inflation theory states that the early universe exploded into an infinite number of different universes, known as the inflationary multiverse, the mirror universe theory is way more economical and predictable.
“It’s an approach that was born out of a certain sense of frustration with previous approaches. In my view, they had all become rather complicated and contrived, including my own approaches,” Turok explained.
Turok and his team’s prediction is that our universe could have a twin in which time moves backwards.
Image credits:Physics
Turok’s mirror universe theory not only suggests a simpler explanation of the universe’s history, but also aims to get some answers about dark matter.
“We realized our idea could solve the puzzle ofdark matter, the mysterious substance that holds galaxies together, in terms of particles that we have not directly seen but already have strong evidence for,” shared Turok.
“These are called right-handed neutrinos. They have been invoked since the 1970s to explain the tiny masses of left-handed neutrinos, which have been observed. Whereas every other model of dark matter postulates a completely new particle, we don’t have to. That came as a huge surprise,” he added.
While the mirror universe theory goes further in explaining things inflation can’t, all the scientific predictions will be tested in large-scale galaxy surveys such as the Vera C. Rubin Observatory.
“Getting the camera to the summit was the last major piece in the puzzle. With all Rubin’s components physically onsite, we’re on the home stretch towards transformative science with the LSST,”excitedlyshared Victor Krabbendam, who’s a Project Manager for Rubin Observatory.
Rubin Observatory, with their 3200-megapixel LSST camera, the largest ever built, is on the way to finding evidence of the multiverse’s existence
Image credits:VERA C. RUBIN Observatory
Modern physics, including quantum theory and cosmology, suggest several theories about how our universe may be just one of many. Until today, all of them have still lacked some proof or evidence, yet it seems that very soon, the situation is going to change.
Thanks to Vera C. Rubin Observatory and their largest digital camera ever constructed, we may find out we are living in an entire ocean of other universes.
People on the internet were overwhelmed with the news about the possibility of the multiverse’s existence
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