Yeah, I'm talking about the single infinite 3D universe introduced in the OP: "In an infinite universe <...>". I think you contributed with the idea of a 4D space with many 3D universes, but for the purpose of the OP I'm assuming a single infinite 3D universe. I'm also assuming that the universe has a finite age and it's expanding similar to our universe. — pfirefry
I don't find the idea of infinity very realistic. — pfirefry
The finite age allows us to consider the regions of the infinite universe so far removed from each other that there is there no way for them to interact with one another. If they sent beams of light towards each other at the moment of the Big Bang, the light wouldn't have reached the destination by today. — pfirefry
This sets the ground for a multiverse within a 3D universe. — pfirefry
Exactly. I'm assuming that singularity was uniform. When the universe started expanding, the areas of space appeared everywhere at the same time, so that space was already infinitely large the moment it appeared — pfirefry
I'm allocating a chunk of space in which an observer will exist. This area of space can be the size of our observer, or our planet, or our galaxy. Arbitrarily, I chose the size of a Hubble volume to connect with the OP. I will introduce the second circle to outline the observable/detectable 'section' of the universe, where the first circle acts as the observer. — pfirefry
let's say that yeast bacteria is living inside the dough. It can travel through the dough over time, regardless of its expansion. — pfirefry
The first circle is the boundary of your heart. — pfirefry
It just expands because new space appears for it to expand into. New bubbles of space are forming in the dough, while no new dough is being created. We don't know where the space is coming from, but we know that it just appears and it causes the expansion of dough. It's not important where the space is coming from for the purpose of the OP. — pfirefry
It just expands because new space appears for it to expand into. New bubbles of space are forming in the dough, while no new dough is being created. We don't know where the space is coming from, but we know that it just appears and it causes the expansion of dough. It's not important where the space is coming from for the purpose of the OP. — pfirefry
Suppose we look at a galaxy near the edge. Far away in spacetime. My copy does the same. The galaxies are different because of interaction with stuff outside the two volumes. But if I see a different galaxy than you, we are not the same anymore. — Cornwell1
Dark energy doesn't have a related particle — Cornwell1
The first circle is the boundary of your heart.
— pfirefry
I digress but, this should be a line in a song :lol: — universeness
Well, in fact there could be two identical parts in the universe. Imagine the space that banged into existence. — Cornwell1
It had a diameter already of 10exp11 times the diameter of the observable universe. — Cornwell1
Dark energy has no related particle — Cornwell1
But why would two identical parts, remain identical over time. Why would every event in each remain identical? Under which scientific imperative? — universeness
Are you referring to the singularity here? — universeness
Well, if two halves on a 2d sphere contain particles that have identical relative positions and velocities , then they will develop identically. — Cornwell1
I assume the singularity to be the Planck-sized mouth on the 4d torus on which two 3d universe inflate from Planck diameter into 10exp11 times the size of the observed universe (about 90 billion ly). — Cornwell1
I know you cant graph a 4D torus but what shape do you posit for the two universes?
Flat? — universeness
So does the singularity still exist as the nexus between your two universes? — universeness
If so do you mean closed in the form of your 4D torus and if so, what shape would that cause in our 3D universe? — universeness
How can a parallel copy of you and me be the same as us? — Cornwell1
Do you think there has only ever been one singularity in existence and if so, what's at the center of every super-massive black hole? — universeness
Like this they fit around the Planck-sized mouth of the open 4d torus. They are tied to a closed 3d space, a sphere, that is wrapped around the 4d mouth like a 1d closed line, a circle, is wrapped around the mouth of a 2d torus. — Cornwell1
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