We do not have a "nothing". Space has energy. And, energy = mass times a really big constant, as pointed out by Einstein and friends. This is new in the sense of only being a little more than a hundred years old. Those with capable equipment can detect particles coming in and out of existence in a vacuum that is more perfect than outer space.
"and sometimes additional particle-antiparticle pairs emerge" (-1) + (+1) = 0 so yep, you can get something from nothing (-1)(-1)(-1) ------ (+1)(+1)(+1) (-1)(-1)(-1) ------ (+1)(+1)(+1) (-1)(-1)(-1) ------ (+1)(+1)(+1) lots of something if you keep them separate, so they don't cancel each other out and become nothing again
Previously, it was thought that the highest particle energies of all would be needed to produce these effects: the kind only obtainable at high-energy particle physics experiments or in extreme astrophysical environments. But in early 2022, strong enough electric fields were created in a simple laboratory setup leveraging the unique properties of graphene, enabling the spontaneous creation of particle-antiparticle pairs from nothing at all. The prediction that this should be possible is 70 years old: dating back to one of the founders of quantum field theory, Julian Schwinger. The Schwinger effect is now verified, and teaches us how the Universe truly makes something from nothing. https://bigthink.com/starts-with-a-bang/something-from-nothing/
Do you think through the same quantum effect of particles coming in and out of existence would still occur if we hypothetically made a pocket dimensions that is completely isolated where "nothing" truly exist?
Additional particles and antiparticle pair are created from nothing. Which would normally cancel out and return to nothing. But one can isolate antiparticles and just keep the regular particles. So "something from nothing"
I don't find any acceptance of the idea that a volume could exist in our universe that had that characteristic. Plus again, these particles aren't coming out of nothing. Energy isn't nothing.
Why do scientists describe it as so? Space may have energy. But that is only true because stars and other cosmic bodies exist within. Giving off radiation. But does fabric of space time itself have energy? What about the pre big bang era? Like, where did it exist if it created space time itself? If it existed at no place and no time, then can you conduct a similar experiment in such a place?
I doubt physicists describe it the way you do in your posts or in the way your site does. I here zero physicists saying that. And, what they do say is way weirder than that! Our universe has an average energy density. Plus, we know that our universe is expanding. Even so, physicists find that our average energy density is not decreasing!!! So, one immediately knows there is something more going on. Mass isn't solving that problem. The reason is that radiation results in a decrease in the mass of the body that is radiating. Our sun is shrinking by its solar radiation, for example. It shrinks by the mass equivalent of all the energy it radiates. The new energy required by the expanding universe is called "dark energy" - so called, because it is not well know where it comes from. Physicists are seriously limited in investigating "pre big bang" ideas, as there is limited evidence (obviously). Of course there are still some theoretical physicists thinking about that issue. So, there are various proposals concerning the origin of our universe. Of course, for all of this those are my words, interpreting physicists I've read. You may be able to find serious physicists who have different ideas. BUT, I strongly doubt you will get any physicist to agree to ideas of creating "nothing" or that matter is somehow supplying the additional energy needed to maintain a constant energy density of the universe as it expands. Mass doesn't behave like that.
I made a theory regarding. That. That our universe sits in the blroohole that exists in the 4th dimension. I made this theory in 2010 or 2011 on an Anime forum. Lol But first, here is a rendition from left to right of how imagine the fabric of space time to work. Imagine that each indent illustrated is on a hyper stretchy fabric that is taught like a drum skin. Blow pressurized air into it from a small nozzle. If you blow a little air, a dimple is formed on the fabric. Some air goes in, but most escapes. The more air you blow from this nozzle, the longer down the dimple will stretch down. As it stretches, down, the neck becomes narrower and narrower. Eventually the neck becomes so narrow that it will only have room for the incoming air. At this point it starts to inflate like a balloon. This example only gives you the idea. As normally, all air would escape because there is nothing to hold it within the dimple. But in my example, I substituted matter for air. If you think about this illusion in the aspect of matter going in, it starts to make alot of sense. Because matter has mass. And mass attracts other matter. Eventually when there is enough matter to hit critical mass, the neck would have grown so thin that there will only be room for the incoming air Having said all that. Back to our universe being attached to the 4th dimention. Here is a illustration of how I imagine our universe to look like. The area within is hyperspace. And we live on the fabric of space time which surrounds its. We exist in a supermassive black hole located on the edges of the 4th dimension. It expands because this black hole consumes more and more matter. Black holes grow after all. As it grows so too does our universe. This would normally cause the energy density to increase. Except that we have our own black holes. The energy coming in is cancelled out by the energy sucked out by our own super massive black holes. Which probably contain mini universes themselves. As shown in the illustration above, some black holes at the edges of our universe naturally expand out from it, but the black holes that are not, expand inwards. And those very black holes are the reason why the universe keeps expanding despite this net zero energy density. As those universes within those super massive black holes inflate, it will press against our own universe from with, causing it to expand.
