Rather that hijack this thread
and send it intoan unwanted direction, I post this:
If a new universe is born each time a choice or desicion is made, does the new universe grow from the origin of the desicion outward at the speed of light…functions of worldlines and light cones?
Or does the whole universe in its entirety become established instantly?
Define “choice” and/or “decision”.
How would the universe differentiate a brain state that has just decided something from one that is in the middle of deciding? I don’t think there is a clear boundary that can be drawn, it’s probably a continuum of neural activity.
Half an hour ago I ate an avocado
In another reality I ate an orange, or perhaps nothing at all.
More than one reality, with a minute change.
Does the effects of that change expand at the speed of light, or does the universe duplicate itself instantly in its entirety?
To my understanding, these parallel universes already exist. There is no need to recreate anything because they are already in existence.
You seem to be impying that there is one “changed” universe, and one “normal” universe. Based on my (very very casual) understanding, it doesn’t work that way - each universe is equally valid.
in an almost infinite, invariably uncountable, collection of universes, i have not clicked the “submit reply” button upon completion of this post.
but in this universe i have.
so there.
In an infinite number of those universes, you clicked it a fraction of a second earlier; in another infinite number of universes, you clicked it a moment later; in an infinite number of universes, you clicked it at the same moment, but you’re wearing black lipstick.
In an infinite number of universes, everything is exactly the same as it is in ours, except they spell parallel ‘parralel’
Do parallel universes converge at infinity?
Si
Could God make a parallel universe so similar to ours that even he couldn’t tell the difference?
Wow ! That is a mindblower
Imagine an infinite number of absolutely identical universes 
I think that may be one of the implications of the many-existing-universes thing - there must be an infinite number of each individual variant (if for no other reason than that the universes that diverge tomorrow on the basis of how many grains of sugar fall onto your cornflakes, need to be the same up until that point)
I already did. Or didn’t. Or did again.
There are an infinite number of universes in which they really are all out to get you.
To reiterate a point made in the other thread, there is not, nor can there be, a scientific answer to these questions. Even if these parallel universes exist, self-consistency requires that there can be no interaction between them, so they can’t be measured or detected, so their existence is entirely outside the bounds of science.
Stop right there. You just switched from GQ to SciFi. The answer to all fictional questions is “Whatever you want the answer to be, little sweetums. Now time for bed.”
Best way I think of to explain it…
(spewing out random information but I’ll assemble it for ya in the end :))
They’re like another dimension sort of.
Your brain is made of quantum particles. When you make a choice it’s ultimately these particles interacting with each other. The thing about quantum particles is they’re “fuzzy” for lack of a better word. You don’t know their exact position and speed until they interact with something (which changes it to a new semirandom value) (more here: Heisenberg uncertainty principle).
The basic idea behind the many worlds theory is that every possible value happens. One particle is slightly different it won’t change your action most likely. So while it’s true in some universes you’ll make different choices because the quantum particles happen to line enough to change your thoughts other universe don’t exist because you changed your mind, you changed mind because you’re a little different (well the alternate version of you anyway).
Given the complexe nature of the brain though it seems more likely if quantum randomness tampered with the brain it’d cause a moment of insanity instead of another choice. Can anyone confirm\deny\educatedly speculate on this?
lets make a box (and hope the formating survives!)
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|___________________|
it has length and width. Each dot is a point. Point 1 is next to point 2 which is next to point 3 ect. Basic geometry.
Now up/down is time and left right is quantum values. The whole graph exists at once. You go up one row it’s a moment in time one moment later. Point 1, row 1 is slightly different quantumly then point 2, row 1. However both points exist at the for lack of a better word, time. One wasn’t created they both existed.
Put another way. There’s a story called flatland about a 2 dimensional world where a 3 dimensional lord sphere visits. To a local square who only sees in two dimensions lord sphere looks like a circle that changes size as it moves up and down relative to the square because the square only sees an infinity thin slice of sphere.
That’s our multiverse (if many worlds is true). Each universe isn’t created it’s just a different section of the quantum reality. All the other possible places, and speeds that particle could have; exist at once. Just we see a thin section of it. Like the flatlander saw different slices of lord sphere as they lined up with his reality.
Hopefully I didn’t over simplify or mangle it. I am not a phycist nor play one on tv, and it’s based on my own layman’s understanding.
ack
other universe don’t exist because you changed your mind, you changed mind because you’re a little different (well the alternate version of you anyway).
should be:
other universes don’t exist because you changed your mind, you changed mind because you’re a little different (well the alternate version of you anyway) in the other universe.
:smack:
In another universe, I probably actually understood you. 
I was going to post something like this. (BTW, have you read Permutation City by Greg Egan? - if not, you should). It’s a weird idea though - if eveything happens all at once, then the real universe is just like a big random soup of events and our universe just happens to be a pattern we managed to find amongst it all; like a Rorschacht test.