The greatest asset of being a human is the ability to imagine
When there is a problem at an unknown level, one of the ideal ways to solve it quickly would be to look for a symmetrical existence at a known level.
For instance, while trying to imagine how a 4-dimensional Cube or a 4-dimensional sphere would look for us 3D beings, we can try to visualize the 3D perspective of 2D beings, and then extrapolate the same from 3D to 4D.
Now, suppose we consider a multiverse society where our universe is just one of the billions of universes that live and die in this multiverse. And the citizens of this multiverse are these universes.
Consider how cells are born, live and die in our body.
Now we will go one level above where humans/other life forms are born, live and die on this planet
Further above there are stars that are born, live and die in our universe
Similarly universes are born, live and die in the multiverse! Our universe is just one of the many such universes that exist in this multiverse. Our universe is no special
Long back people thought that Earth is special, God favored earth while creation, all stars and planets move around earth, Earth is flat etc. There was the geocentric theory. So the gods of those days acted accordingly in holy books where the God preferred only earth. People like Galileo, Giordano etc who thought otherwise were prosecuted by the church. Giordano Bruno was burnt alive for claiming Sun, and not earth was the center of the universe!
Then people started realizing that Sun is the center of the solar system only, and Sun is just another average medium sized star in the galaxy.
Then we came to know that our galaxy is just another medium sized galaxy in the universe, and bigger giants like Andromeda exist out there.
But our universe itself was created by God! Isnt that special? Well, as science progresses, the notion of an absolute God who exists outside the universe and created this universe is becoming obsolete.
There exists only one culture in the world which talks about multiple universes and it is the ancient Indian vedic culture . In religions like Christianity God is considered to be a creator who exists outside the universe and creates this universe.
But according to the Hindu vedas, God is the entire universe itself and this God extends beyond our local universe. The local universe is called Brahma which came out of a Brahmand. This local universe is said to exist within the multiverse (represented by Vishnu. Brahma is born out of Vishnu!). Vedas say that Brahma has a death, in other words our universe dies! Where as Vishnu who is the multiverse is said to be eternal. There are thousands of Brahmas who have come and gone within the Vishnu say the vedic texts!
So a universe created out of a big bang lives and dies. There are thousands of such universes that exist within the multiverse. So our universe is also not really special
And as far the multiverse is concerned, it is ever existing and eternal. So there is no need of a creator for this multiverse.
Now how is this multiverse society? Numerous big bangs happening. Most of them might not evolve into a full fledged universe like ours, because if we go by the bigbang model, there are a lot of factors that have contributed to the stability of our universe. The slight advantage of matter over antimatter , the inflation, perfectly tuned physical constants, enough time for galactic formations, etc.
So is the fertility rate low in the multiverse, with a lot of abortions? Where most universes collapse before they evolve!
Most physicists would tend to think so. But I think that most universes that are born in the multiverse actually evolve into successful universes like ours
Consider the cells in our body as intelligent scientists, who finally discover that the body actually started from a single cell. This is just like the way we discovered about big bang as the single point where our entire universe was born.
Now the cells might also tend to argue that most of the single cells are flop and most babies are abortions They would tend to think so because, these cellular scientists wont know that in nature there already exists beautiful biological mechanisms that would facilitate the smooth creation/birth of a baby!
Similarly. probably we are not aware about the beautiful bioniversal mechanisms that exist in the multiverse that facilitates smooth birth of universes like ours! In other words, successful big bangs and evolution of universes might be quite common phenomenon in the multiverse, just like the way babies are born in our world!
For the cellular scientists in our body to understand that most babies are born successfully and live a full life, they would have to look out of their universe (i.e the body in which these cellular scientists live) and understand things beyond their local universe called the body in which they live!
Similarly we should look beyond our local universe Brahma and look deep into the multiverse Vishnu and try to understand the way things in this multiverse function.
Does the collision of branes produce baby universes? Are branes the citizens of the multiverse?
There is one fascinating interesting twist for science in this multiverse. Our science simply does not hold there. The way the physiological features of two babies are different, the same way the physical laws of two universes might be different, and so might the science in these two universes be different!
So in a later generation, students might learn in the schools about different set of laws and equations for different universes. Even, General relativity itself might be different in different universes!
For instance, a part of the physics textbook in the future might read something like this
In the universe Brahma there are four fundamental forces of nature. In the universe Abrahama there are six fundamental forces of nature.
A question paper in the future might also contain a question like below
What is the difference between gravity in Brahma (our universe) and Anandobrahma (another nearby universe)?
What is the speed of light in the universe Gautama?
Can we travel between the different universes? What will be the nature of matter in the other universes? Will it be like a human cell trying to enter the body of another human, or will it be like a human cell trying to enter the body of an elephant?
Will there be different species of universes? Like for instance one species is of our universe which is made up of matter, antimatter, space and light.
There might be another species of universes which are made up of glatter, phaze, himtrinos and svegiam.
How will the space in which these universes roam about in the multiverse be? Or will there be anything called multiverse space at all? Probably there is no such thing as space in multiverse, and all universes literally overlap each other. Probably right next to you there is another bigbang that just happened, but you didnt realize it because there is NO space between you and that other universe that was just created. Probably somebody in another universe waved a hand at me thinking on similar lines! What we see ain’t what it is ?
Even more stranger thing would be the non existence of time in the multiverse. There is no space/time in multiverse. These are properties within universes only. Time travel would then be possible only within local universes, because time cannot be relatively measured between two different universes as time is defined only locally in a universe.
When a universe expands or contracts it does so only intrinsically, and not extrinsically. To put in simple terms, its like a balloon inflating in size as seen from inside the balloon, but as seen from outside it continuous to remain deflated, in fact there wont be dimension/size at all for the balloon as seen from outside
Probably there will be worm hole trains in the future that will offer trip to parallel universes. As we enter the parallel universe, there will be technology to transform us into the constituent matter form of the parallel universe, without killing us. And once we are back, we will be converted back to the matter form of our local universe as we enter our universe! Probably we will also be able to simulate bigbangs locally!
Thank God, thinking is free and that too non-taxable, one can explore unchartered territories of one’s own thoughts