Is the multiverse real? Where did we come from? How? Why?
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I know that our system of maths is very flawed, incomplete, and undecidable. Is it reasonable for me to say that the concepts of infinites are also part of said "flaws"? What if they are systems where we attempted to put our basic logic and sense into topics that are inherently nonsensical, illogical, and simply don't work like that. What if every single concept of "infinity" that we have is exactly an indication of where we failed at understanding a core subject in this universe. If you think about it logically, if the universe were to truly utilize such systems in its core that are undecidable, have no proof, flawed, "infinite" etc. then it's highly unlikely that any of this would even be possible, we already know that it's a literal flaw.
Is our universe really infinite? What is outside, the multiverse? How is it possible for such insane complex systems and theories like the string theory to exist in this seemingly simplistic universe. Where. The hell. Did we and this all come from? Why? How? I must know.
If you asked for my theory on the structure of the outer universe, beyond our observable part then I would tell you that I thought that despite us trying, and failing to find evidence that our universe was spherical. That it actually was spherical, just FAR too large for us to detect. Sort of like asking you to explain how the earth was spherical when you were at ground level and just walking around. Quite hard. And if you were to straight up from this spherical universe, you would possibly reach higher dimensional levels between the multiversal macrocosm, and you'd be able to see other universes of various sizes. Like, that seems the most logical explanation to me, nothing else resonates with me. We have spherical planet systems, star systems, etc. Who’s to say that the same doesn’t govern the hypothetical multiverse?
Maybe the fabric between multiverses does not utilize light to carry information, but something else of a higher dimension. Or maybe it does utilize light, however, everything is this dark emptiness, until you got close enough to other places, for the light to reach you and have spread out to such a distance. Or maybe, the space between the multiverses is dominated by nothing but dark matter. That is how it makes sure that other universes don’t collide with each other, and they remain isolated.
The universe’s density parameter, represented by the Greek letter Omega Ω, can also tell us about the curvature of space on large scales. Einstein showed us that mass curves spacetime, so a universe dominated by the self-gravitation of its cosmic web, should curve all the way around and form a sphere. Such a thing can be represented with the aforementioned Omega letter, designated greater than 1, so Ω > 1 , and would be considered to be a “positive curvature”. But what if the Ω value is less than 1? So negative curvature?
Enter Dark Energy. In 1997 the Hubble Telescope made it possible for us to see that the universe was not in fact slowing in its expansion, in fact, it appeared to be accelerating, which suggests that perhaps, the majority of the “matter” in our universe is taken up by this dark energy, which is an as of yet undetectable type of “matter” or “phenomenon” that appears to have inverse properties in the fabric of spacetime, instead of curving spacetime like normal matter would, it inverts it and exerts negative pressure. And if it turned out that the majority of our universe’s contents owe to this dark energy, then it would mold space into a peculiar, open-ended, hyperbolic curvature, or negative curvature.
In a universe that is negatively curved with an Omega value of less than 1, the gravity exerted by the cosmic web and everything out there would be too weak to halt the universe’s growth, leading to a period of runaway expansion that lasts forever. Such a universe would have a strange and irregular shape, like for example a horn, or a weird saddle, or a weird funnel. All of which are difficult to describe and imagine especially at such insane scales. Such a universe could be infinite, or finite but forever-expanding.
What if the Omega value is exactly 1? In that cosmic knife-edge the universe would be considered at “critical density”, or about 5.7 hydrogen atoms per cubic meter of space. As you could probably imagine, in such a scenario, the positively curving influence of gravity exerted by visible matter and the negative force exerted by dark energy would be equal, resulting in no curvature and a truly “Flat” universe.
Such a universe is not capable of closing itself off in any way shape or form, and as such is a truly “infinite” universe. Sort of like an unending sheet of cosmic paper. With gravity and dark energy balanced, an universe at the critical density is not capable of reversing its expansion. Instead, a flat universe sits on the boundary for something called “recollapse”. A strange theoretical state where the universe’s gravity would be sufficient to bring its expansion to a halt, without causing it to collapse, but only after an infinite amount of time. In other words, like the negatively curved universe, a flat universe would be destined to expand into infinitum. And that scenario is currently the one scientists have found the most evidence for, our universe based on current and repeated measurements seems to be scarily flat.
So, in conclusion, there is no conclusion to our origins, or where we and our universe will end up, besides just maddening speculation and theories, at least for now. How’s that for a weird paradox? Much like the “logic” of our universe itself, there is no logic. In fact, we have to thank chaos and illogic directly for logic and order to form, and for everything me and you know and see to be possible, in a massive twist of irony. I recommend getting Universe Sandbox², it’s a fantastic simulation game where you can play around with basically the entire universe, like bombarding our planet with basketballs going 10 times the speed of light, anything. It is something fun you can engage with if your mind is wandering and you have nothing to do. It will also offer you a practical way to discover the concepts I have discussed, and learn other things about our universe and how it works. Not going to lie writing this blogpost and its conclusion irritated me severely, I always want to arrive at a conclusion and be educative, but I felt like I did anything but either of those, you’re probably going to walk away with more questions than answers, and that’s okay. That is exactly an indicator that you understood everything, because that is exactly how our universe works, in a way we are currently unable to understand. Still irritating though, I feel like I failed.
