Unless you want to posit god the continuance of existence is a fact, due to the law of conservation of energy. In order for the bang to occur the matter had to be there to explode in the first place. You can’t have an explosion of nothing. An explosion of nothing is a miracle of godlike proportions, and positing god just adds the complexity of the creator of god and then his creator’s creator, in an infinite loop of creator beings that mirrors the common expression turtles all the way down. Either existence always was and always will be, or there is something else we don’t yet understand at play here, as far as the cosmos is concerned.
As a baseline, our understanding of what is occurring really is in question. What we casually refer to as dark matter and dark energy makes up most of what we refer to equally as casually as the universe. Dark matter is no more certain to be one simple thing than dark energy is. These are merely placeholders like unobtainium, a number to plug into the missing holes in our understanding of the universe. We don’t know what most of the universe is made up of, and we don’t know what kind of energy is pushing it to expand at the rates that we can measure from astronomical observations. We simply can’t see everything we need to see to understand the universe at a fundamental level.
In much the same fashion, black holes exist both in this spacetime and outside of it. The Schwarzschild boundary marks the point at which normal space ceases to exist. Inside that radius we can’t know what is occurring because spacetime breaks down beyond that point. We can, and do, theorize as to what occurs and maybe, someday, we will be able to test some of these theories. But until we can go and directly measure a black hole what we are left with is mathematical proofs that we must accept as true because the math is valid to the extent that we understand it. In the meantime we have found black holes in our observation of the universe, so their existence is an established fact, much like the matter that we can calculate is present in them even though we can’t see them directly. That is the part of them that is outside of our spacetime, the matter we can’t see because it passed the Schwarzschild radius and is invisible beyond the lensing effect of that radius.
The above is simply the prequel of this entry to the blog. The bare minimum explanation that I feel I need to include before even linking the podcast that spawned this little jaunt down hypothetical lane.
Inquiring Minds, 135 Sean Carroll – Life, Meaning, and the Universe Itself
Inquiring Minds is a show that I listen to pretty regularly. There have been two or three episodes that I passed up over the run of the series, but as a rule I try to give them a listen because I find their reliance on science to be pretty solid. This episode though, this episode pushed the limits for me. I liked the conversation, but I disagree with the conclusions that Sean Carroll comes to in the episode. Conclusions that he states with far more certainty than we can possibly justify, even with my limited knowledge of the math involved. We simply don’t know how the universe will end, or even that it will end. We don’t know that it ever began, either. He said as much in the podcast, but then he went on to repeat the heat death story that most physicists fall back on these days.
If any part of string theory is real then there are other dimensions to spacetime than the four dimensions that we currently can measure. In any one of the many other possible dimensions, gravity may have effects that we can’t predict and that gravity might very well exert forces that would explain some of the measurements that we currently mask with the labels dark matter and dark energy. To phrase it the way I prefer to think about it, the universe is currently accelerating into the big bang. The universe is a nearly indescribably complex toroidal shape, in my estimation, but even that is a gross oversimplification. Hawking radiation hasn’t been demonstrated to exist, so black holes don’t necessarily evaporate away. Nor do we know that space without mass and time is really a thing that exists at all. What we can say is that the universe appears to have sprang from what we think is on the other side of a black hole.
Who is to say it isn’t the same one at both ends? I’m certainly not well-versed enough in the math required to argue this conjecture knowledgeably. What I’m attracted to is the poetry, the symmetry of the circular rhythm created by the universe expanding and contracting over eternity, spawning and collapsing the multiverse or many worlds hypothesis that seems to be the most promising explanation for observed quantum effects that we’ve come up with. Maybe, just maybe, they are occurring simultaneously on different dimensions.