ARE WE ALONE IN THE UNIVERSE? / THE CONCEPT OF MULTIVERSE
How's it going fam? Today I bring you a topic on which we all ponder - "ARE WE ALONE IN THE UNIVERSE?". This question has been in our mind since forever right? When I was a kid I always wanted to know the answer to this question thinking what would it be like to make friends with someone living in another universe. I was probably dumb to think of something like this!
OR WAS I?
LET'S DIVE DEEP INTO THE TOPIC TO FIND OUT!
First off, what do we really mean by a MULTIVERSE?
It is just a set of various possible universes including the universe which we live in.
Now you must be thinking what on earth do I mean by possible universes. How does probability come into picture while studying this topic which, you might think, has nothing to do with it. If you think so, I'm afraid that you are wrong. Probability, in fact, is the main idea behind this prediction made by the scientists.
To understand this let me give you a situation -
The idea that governs the idea of the multiverse started with the BIG BANG when this universe, from a very high-density and high-temperature state, was being made. What triggered this singularity to explode and scatter its constituents into the 3 Dimensional space is still not known. All we know is that the universe has been expanding at a fast rate since then and will continue to expand until we become so far away from the other galaxies that our upcoming generations would start to think that no galaxies existed at all except the Milky Way.
IDEA 'A'; OUR UNIVERSE IS NEVER ENDING
But if the spacetime, whose form the scientists are uncertain of, is infinite than at a point of distance it must start to repeat itself creating an endless loop of it from scratch. If it does so, than its also true that infinite number of our copies exists in this spacetime continuum.
This means that if you look far enough, it is likely that you will find an another version of 'YOU' which might be doing the same thing that you are right now or may be someone complete opposite of you. This is the idea of infinite universes.
IDEA 'B' ; INFLATION OF UNIVERSES
But, according to Alexander Vilenkin, some pockets of space time stops inflating while others continue to inflate at a rapid rate. This inflation an non-inflation of some pockets of universes gives rise to what is known as bubble universes. Paul Steinhardt introduced the first model of Eternal Inflation in 1983.
Our universe is one of the non-inflating universes. We know this because our universe contains STARS, PLANETS, GALAXIES, etc. But most of our space still contains vast bubbles of universe which are still inflating, within which the fundamental laws of physics could be very different than that of ours and very strange.
Also, it has been thought, that when these bubble universes collide in space, they create some openings or portals to their likewise universes.
EVER THOUGHT WHAT THE DEVIL'S TRIANGLE IS?
IDEA 'C' ; STRING THEORY'S IDEA OF PARALLEL UNIVERSES
There may be many more dimensions in our known world with only 4 dimensions; three of Cartesian's length breadth and height and one of time fused together to form spacetime. So, having our own 4-dimensional BRANE, other 4-dimensional branes may be floating in the higher dimensions.
String theory is directly linked to the thought that our universe is one of the numerous slabs floating in the higher dimensions of space. You can read more about it in the book named The Hidden Reality written by Brian Greene.
A deeper thought into this theory suggests that these brane universes are not necessarily always parallel and out of reach. Sometimes, they might slam into one another causing repeated big bangs over and over again.
IDEA 'D' ; AN INDEPENDENTLY EXISTING UNIVERSE
So if this is true, then a particular mathematical function which describes our universe may not be the only option. There may be thousands of other mathematical functions describing other universes as well giving rise to the possibilities of multiverses.
"A mathematical structure is something that you can describe in a way that's completely independent of human baggage," says Max Tegmark.
"I really believe that there is this universe out there that can exist independently of me that would continue to exist even if there were no humans," says he.
SOURCE
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REFERENCES
🔵WIKIPEDIA
🔵BBC