A new theory that the universe is expanding because it swallows and absorbs tiny “infantile parallel universes” has been announced, and it matches observational results more precisely than current cosmology.

A new theory that the universe is expanding because it swallows and absorbs tiny “infantile parallel universes” has been announced, and it matches observational results more precisely than current cosmology.

The universe continues to expand at an accelerating rate, a fact supported by observations made by the James Webb Space Telescope. The existence of dark energy has been suggested as a candidate for the force accelerating the expansion of the universe, but a new theory has been proposed that says it expands by absorbing other universes.

Is the current acceleration of the universe due to merging with other universes? – IOP Science

https://iopscience.iop.org/article/10.1088/1475-7516/2023/12/011

A new theoretical study suggests that our universe is merging with “emergent universes”, causing it to expand

https://www.livescience.com/space/cosmology/our-universe-is-merging-with-baby-universes-causing-it-to-expand-new-theoretical-study-suggests

Research on the cosmic microwave background, the afterglow created by the Big Bang, has revealed that the speed of the universe's expansion is gradually increasing. In order to apply this observed fact to cosmological theory, physicists hypothesize that “dark energy, an unknown force filling the universe, is pushing the universe outward.” However, while it has not been possible to confirm this, many astrophysicists are starting to consider other possibilities.

In a study published in the Academic Journal of Cosmology and Astroparticle Physics on December 12, 2023, scientists say: “The expansion of the universe is the result of repeated collisions and mergers with other universes.”

“The main finding of our research is that mysterious dark energy is driving the accelerating expansion of the universe,” the study's lead author, physicist Jan Ambjörn of the University of Copenhagen in Denmark, told science news site Live Science. Instead, a simpler and more intuitive explanation could be a merger with a so-called “baby universe.” A cosmological model for this would be more observable than the standard cosmological model, and might fit the data well.

The idea that our universe interacts with other universes has been proposed in the past, but Ambiorn and Yoshiyuki Watahiki of the Tokyo Institute of Technology are new to the idea of ​​other universes interacting with other universes, and we have developed a mathematical model to explore the hypothetical influences on the evolution of our universe. From that formula he concluded that the merger of this universe with another universe would increase the size of the universe, and that this could be perceived by human observation devices as an expansion of the universe.

When the research team calculated the expansion rate of the universe using this theory, the results were closer to the results observed from traditional cosmological models.

Moreover, this theory can also address the problem of cosmic inflation. The universe in which humans live is said to have expanded dramatically in milliseconds immediately after its creation in the Big Bang, and until now inflation has been explained as resulting from a hypothetical field called “inflation.” Inflation remains unclear.

On the other hand, a new theory suggests that the reason our early universe suddenly expanded is because it was absorbed into the larger “original universe.” Our universe, which was swallowed by a larger universe and grew rapidly in size, continued to swallow smaller baby universes and continued to grow larger and larger until it reached the present day.

So far, we don't know the details of the process by which universes merge, so we can't be sure whether the scenario suggested by this theory will come true, but Dr. Watabiki told Live Science: “Euclidean telescopes and I'm confident of that.” “James Webb Telescope observations will help us determine the model that best describes the current expansion of the universe.”