How do scientists define the multiverse?

Answer 1

it is a theory which basically says there is more than one universe. Instead there are infinite universes all consisting of different versions of the other resolving in infinite possibility across infinite time zones.

Answer 2

According to the laws of physics as currently known:

The concept of the multiverse is purely hypothetical. Although the term has been around since 1895, the ideas around it are constantly evolving, and the subject is often visited in Science Fiction. Multiverses are still in the theories stage, and have not been proven.

Some of these theories include the many-worlds hypothesis and the bubble universe theory. In the latter, there are an infinite number of universes, each with different physical constants and characteristics. In this theory, it is impossible for anything to travel between different universes, or else they would be one universe. It is thought that universes are stacked one on top of another. These stacks would continue forever, endless stacks placed side by side and on top of another. Of course, each universe would contain the same celestial bodies (planets, galaxies, clusters, super-clusters) as ours.

Other theories support the idea of travel between different universes through the means of black holes and white holes. Even then, there are different schools of thought on how this can happen.

Theory of black hole travel:

Each black hole has an opposite end called a white hole (yes, I understand that this seems redundant and ironic seeing as white is opposite black and vice versa, but hear me out)...where a black hole absorbs all matter and energy, a white hole does the opposite and releases all matter and energy...but in order to successfully travel between the two worm hole ends and survive you need a vast knowledge of quantum physics and the universe...and on another note...a multiverse is the outcome scenarios of our lives' choices...for every option in the choice we do not take, a new universe is created to compensate for it.

Theory of white hole travel:

Where as you can actually travel between universes through white holes, black hole travel is impossible, and here is my reason: black holes are essentially planets, where gravity has compressed the planet to it's limits, where it cannot be anymore. This allows it to suck in other planets, were the planets it sucks in, basically merge with it, because of the gravitational pressure, so black holes are sucking in everything they can, eventually becoming bigger and bigger. Black holes aren't the only things that do this, normal planets do to, they just aren't as strong as a black hole, and which ever is larger, sucks in the other planet, same rule applies to black holes, where as the bigger black hole would suck in the smaller one, and the already bigger one, would become larger.

The phrase "Meet me at the Multiverse" is comparable with "Meet me at the Casbah". See the provided links:

Answer 3

according to the theory our universe is not the only one, but it is like a bubble in the vast multiverse

there are other universes in the multiverse too, each with different laws of nature

Answer 4

The multiverse is a hypothesis that describes more than one universe making up the totality of physical reality. The other universes would exist in our space-time but the configurations of matter and energy would be different in each and so would the physical laws and constants. Each of these 'parallel universes' would be like bubbles that either fission in half or fuse together. The multiverse is the best model for explaining cosmological inflation which is posited to have occurred not long after the Big Bang. And so our Big Bang may have spawned other universes but most of them probably would not have the physical laws and constants that would have led to the origin and evolution of life and intelligence.