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New Scientist: "String theory may limit space brain threat"

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Angry Grimace

Two cannibals are eating a clown. One turns to the other and says "does something taste funny to you?"
Didn't they have a few of these in the Department of Mysteries?
 

gwarm01

Member
What's to stop each and every one of us from spontaneously reforming on an infinite number of earths then? Given infinite time, probability means nothing.
 

Eusis

Member
I have to admit, the "space brain" thing kind of intrigues with the idea that maybe the universe exists for them and we're just a freak anomaly that reached the same end from a different, possibly more flawed route. Kind of Lovecraftian actually, sans the horror aspect, just the "we're nothing in the greater scheme of things" angle.
 

The Technomancer

card-carrying scientician
What's to stop each and every one of us from spontaneously reforming on an infinite number of earths then? Given infinite time, probability means nothing.

Nothing to stop it. Just probability to determine the relative frequency of its occurrence.

Man, thank god for the Planck time. Without that everything would get really weird
 

Monocle

Member
don't be bitter.
You're assuming it's even possible to be bitter. What is bitterness, exactly? Can you locate it? How do you know that what you think of as bitter corresponds to what I think of as bitter? Who are you? Who am I? What are we? Are we? Is what is, is?
 

The Technomancer

card-carrying scientician
How would a spontaneous brain survive even survive without oxygen, glucose, etc.?

It doesn't necessarily have to be biological as we think of it. Just capable of the energy/matter manipulation patterns analogous to our methods of thought. Or even more broadly just something that we could "recognize" as thought.

Of course there's also the possibility of something we couldn't recognize, but that's kind of a futile road to travel.
 

akira28

Member
Oh, so we're talking ghost space dicks here.

space dicks made from energy and exotic matter? sure.

You're assuming it's even possible to be bitter. What is bitterness, exactly? Can you locate it? How do you know that what you think of as bitter corresponds to what I think of as bitter? Who are you? Who am I? What are we? Are we? Is what is, is?

actually...
you're not really bitter, you just think that you are, but it would be better for you to stop deluding yourself with your imaginary bitterness. You are addicted to feeling, which is understandable, but wouldn't it be better to focus on more enjoyable sensations?
 

The Technomancer

card-carrying scientician
You're assuming it's even possible to be bitter. What is bitterness, exactly? Can you locate it? How do you know that what you think of as bitter corresponds to what I think of as bitter? Who are you? Who am I? What are we? Are we? Is what is, is?

The Bart, the
 

cdyhybrid

Member
The way I interpreted it was this:

String theory states that particles are actually waves, but we can only observe them in a particular snapshot of time, not in motion in their "wave" form. To expand on that, the universe (made up of said particles) we observe is only as it is when we observe it. In the future, given infinite time and thus an infinite number of brains, they will observe the universe infinitely more times than the human race has/will, thus, the universe will have been observed from a brain point of view infinitely more than from a human point of view.

Given that, one could make the statement that the universe observed by the brains is the more "regular" version of the universe compared to the human version, because the human version has only been observed, say 6 billion times, whereas the brain version has been observed...100 million billion trillion times.

So really, the universe observed by humans is some isolated, weird, alternate reality compared to the vastly more "common" brain version of the universe.

Am I on the right track?
 

Mgoblue201

Won't stop picking the right nation
How are these spacebrains typical observers? Why do they get that label? Why aren't rocks typical observers? What does it mean to 'observe' in this context? If these brains cant survive, then what does it matter?

And what sort of cosmological principles wouldn't work anymore? What assumptions are being made that would be ruined by the existence of theoretical spacebrains later on?

I dont think I'm going to be able to wrap my head around this.
This is what I think he means by typical observer. Essentially, imagine the entire history of the universe stretching from the initial moments of its low entropy state all the way into an infinite future in which all matter is evenly displaced and uniform (as some models predict). Since under this model the universe will never end, our present occupation of the universe at 13 billion years since its inception represents only a small amount of time. This present state is "unusual": a relatively low entropy state. In the future, the universe will exist for an infinite amount of time, much of which will be spent in a high entropy state.

However, even in this high entropy state, there is a small chance that a part of the universe will at random decrease its entropy. This could take the form of anything, even a brain (the idea of a brain appearing at random is intentionally meant to be absurd). Since the universe will not end, but merely continues on for infinity, a brain like this has a chance of appearing, multiple times. Boltzmann's brain is more "typical" because this high entropy state in which the brain appears is much more common than our present state. In order for a state like ours to appear again, the entire universe would have to return to a low entropy state, which is much, much rarer than a random brain appearing.

Edit: Actually, I don't know if you could literally get "anything" by decreasing entropy. I don't know enough about physics to make that claim. A brain is just a common example.
 

Woorloog

Banned
my brain hurts from reading that.

Are you begging an avatar quote?


So... There might be a formation of particles that form a consciousness for a moment in the universe? And if the String theory is correct, they won't overrun the universe?
And these minds...
Who thinks this stuff?
 
G8eU7.gif



...

I am so confused.
 

Foffy

Banned
Are you begging an avatar quote?


So... There might be a formation of particles that form a consciousness for a moment in the universe? And if the String theory is correct, they won't overrun the universe?
And these minds...
Who thinks this stuff?

People farrrrr out of the main pools of society. Like most scientific breakthroughs.
 

Timedog

good credit (by proxy)
I don't get it. If Boltzmann brains or whatever outnumber us, or whatever the fuck it's saying I'm so damn tired, why does that matter? How does it have any effect on anything if a bunch of space brains experience the universe too? I'm so lost. And sexy.
 

akira28

Member
From the mind of Time comes, Brains!



You mean the one with paradox during the end of time?

yeah and everyone ending up as little dessicated heads kept alive by little metal headcases.

edit:
it's an interesting, if fucking spooky theory. Seems like it's a logical conclusion drawn from some other hypotheses. If higher consciousness as we understand it can evolve from the known processes of the known universe, then who knows what could come out of the chaos of the largely unknown and greater infinite universe. And the idea that consciousness evolved because it was a necessary component of our universe, then in the greater universe, it's possible for the conditions necessary for the bootup process of consciousness to occur somewhere out there in the...I'm guessing physical mega-universe. Not consciousness as the biological process of an actual brain, but something else, a "blinking cursor" with a way to gather and process data and stimuli, built out of time and space itself.
 

Mudkips

Banned
I think some people are misunderstanding the reason Boltzmann brains are supposed to be a problem. It's not that they're going to encroach on our territory and eat us or some such. IIRC it's more akin to Bostrom's simulation argument.

The simulation argument goes something like this:
-assume that simulations are possible (simulations meaning a whole universe and population of sentient beings that are wholly contained in a computer)
-assume further that simulations within simulations are possible (inside a simulated universe, someone builds a simulated computer and runs a simulated simulation on it)
-once our technology advances enough, there will be lots of different people running these simulations
-oh look, there are now some mind-bogglingly vast number of simulated universes out there
-if there are, it is vastly more likely that we are one of the simulated universes than that we're the lone original universe.

The Boltzmann brain argument is similar:
-I believe myself to be a consciousness experiencing the planet Earth in the year 2013 etc
-One possible explanation for that is that I am a physical brain in a physical body on the planet Earth at that time
-Another possible explanation is that I'm a Boltzmann brain, a randomly arising configuration of particles that happens to correspond exactly to a physical brain on the planet Earth at that time, thus giving rise to an identical experience
-If there are in fact Boltzmann brains, and they do outnumber us (in the future, presumably), then it's more likely that I'm a Boltzmann brain than a physical brain in a physical body

Someone correct me if I'm remembering this wrong.

A Boltzmann brain is just a conscious entity. It wouldn't think it was a person on Earth unless Earth itself existed for it, either separately or as part of the random shit. If Earth existed for it, there's no existential crisis for the Boltzmann brain, and you don't need to worry about being one. Everything is very real to you because it is real, regardless of whether or not you're a bbrain or an an ebrain. You could have popped into existence just now, sitting in your chair, on a planet full of ebrains who happen to think you were always around. So what?

If the bbrain is crazy and is imagining being a person on Earth when it's not, again, so what? It's just like you, an ebrain, wondering if you're really in a padded room in an insane asylum in the year 1894.



If there are bbrains rains they would not outnumber ebrains. Ebrains requirements are higher in entropy than bbrains. Bbrains occur instantly due to insanely low levels of entropy, ebrains develop gradually due to moderately low levels of entropy over a period of time.

Assume a brrain and an equivalently-complex ebrain require an entopy level of 100 rando-fucks.

A bbrain would need entopy in some location to drop all the way down to 100 rando-fucks for 1 planc time.
An ebrain would need entropy to drop down to only 100,000,000 rando-fucks, but for 1,000,000 planck times.

Because of a little thing called causality, ebrains are more likely. Pockets of space don't have wildly fluctuating entropy levels. Some pace with low entropy will have low entropy for some length of time. The larger the Universe gets, the longer this length of time gets, making it easier for ebrains. Ebrains also have the benefit of being able to seek out lower entropy for themselves and their environment (the whole evolution part of ebrains), again making them more likely than bbrains.


For a simulation scenario, so what if it's all a simulation?
 

Seanspeed

Banned
This is what I think he means by typical observer. Essentially, imagine the entire history of the universe stretching from the initial moments of its low entropy state all the way into an infinite future in which all matter is evenly displaced and uniform (as some models predict). Since under this model the universe will never end, our present occupation of the universe at 13 billion years since its inception represents only a small amount of time. This present state is "unusual": a relatively low entropy state. In the future, the universe will exist for an infinite amount of time, much of which will be spent in a high entropy state.

However, even in this high entropy state, there is a small chance that a part of the universe will at random decrease its entropy. This could take the form of anything, even a brain (the idea of a brain appearing at random is intentionally meant to be absurd). Since the universe will not end, but merely continues on for infinity, a brain like this has a chance of appearing, multiple times. Boltzmann's brain is more "typical" because this high entropy state in which the brain appears is much more common than our present state. In order for a state like ours to appear again, the entire universe would have to return to a low entropy state, which is much, much rarer than a random brain appearing.

Edit: Actually, I don't know if you could literally get "anything" by decreasing entropy. I don't know enough about physics to make that claim. A brain is just a common example.
So things will change a lot in the future. I get that. But so what? Why does that change anything we know now? What do spacebrains and the number of them have to do with anything? I dont think it being a brain is a completely random choice of object by what it sounds. Cyan mentioned something earlier about how our existence could actually be something to do with it, but I dont understand that part, especially as a brain in space couldn't survive.
 

akira28

Member
So things will change a lot in the future. I get that. But so what? Why does that change anything we know now? What do spacebrains and the number of them have to do with anything? I dont think it being a brain is a completely random choice of object by what it sounds. Cyan mentioned something earlier about how our existence could actually be something to do with it, but I dont understand that part, especially as a brain in space couldn't survive.

I think the theory goes that if previously there was a massive universal change that made "consciousness" possible, as part of our relatively highly organized universe...if we're a product of that organization, then changes like that in (possibly connected) 'universes' (local parts of the same giant infinite thing) where organization isn't there, or has broken down like our local universe will one day be, (a place with high entropy)...if consciousness as we know it was such a rare occurrence, then other consciousnesses of this other sort could be conceivably less rare. And they might have formed in these other areas due to those "fluctuations". I think you first have to imagine that our universe is a tiny corner of a more infinite one. But we have a hard time with that concept of infinity anyway.

I'm not sure what they mean by local parts of a larger universe. Like bubble universes, or pockets separated by void or what.

oh god, floating superminds that are lonely and insane.
 

raindoc

Member
I don't get it. If Boltzmann brains or whatever outnumber us, or whatever the fuck it's saying I'm so damn tired, why does that matter? How does it have any effect on anything if a bunch of space brains experience the universe too? I'm so lost. And sexy.

It matters because you will be eaten by space brains. Tomorrow.
 
I read the entire article in the first post in the voice of The Guide from the Hitchhiker's Guide to the Galaxy movie. Don't know why, it just happened.
 
Sorry guys, that's one less chance at an after life.
Shame, I was kinda betting on an infinite universe eventually recreating me, but if the universe is finite then death truly is non-existence.
 

Cyan

Banned
A Boltzmann brain is just a conscious entity. It wouldn't think it was a person on Earth unless Earth itself existed for it, either separately or as part of the random shit. If Earth existed for it, there's no existential crisis for the Boltzmann brain, and you don't need to worry about being one. Everything is very real to you because it is real, regardless of whether or not you're a bbrain or an an ebrain. You could have popped into existence just now, sitting in your chair, on a planet full of ebrains who happen to think you were always around. So what?
I don't think that's how Boltzmann brains work. My understanding is that it pops into existence, some particles move around in such a way that it thinks it's experiencing things (and has memories of having experienced a lifetime of things and so on) and then pops back out again because it's in the middle of hard vacuum.

If the bbrain is crazy and is imagining being a person on Earth when it's not, again, so what? It's just like you, an ebrain, wondering if you're really in a padded room in an insane asylum in the year 1894.
Yes, it's more or lerss equivalent to the brain-in-a-jar/Matrix argument. You might not really be experiencing stuff, you might be just a brain being fed false experiences in the form of direct neural stimulation.

And yes, as far as daily life goes, it's more of an existential angst-generator than anything else. I mean, does it really matter if your experiences are real or if you merely think they are? I'll leave that one to the philosophers.
 

Kurdel

Banned
It is an interesting concept, but ultimately dumb.

I mean, the whole thing rests on the idea that eventually, everything is possible in an infinite universe. Our universe is not chaotic enough to generate the infinite randomness needed to create ridiculously improbable events like the Boltzman brains.
 

BocoDragon

or, How I Learned to Stop Worrying and Realize This Assgrab is Delicious
In an infinite universe, there is a random change that a GAF user might blink into existence.

In fact, the mathematics dictate that there will be far more of these cosmic GAFfers than human GAFfers.

In all probability, you are the only human on this forum.
 
It is an interesting concept, but ultimately dumb.

I mean, the whole thing rests on the idea that eventually, everything is possible in an infinite universe. Our universe is not chaotic enough to generate the infinite randomness needed to create ridiculously improbable events like the Boltzman brains.

If it's infinite, it will happen - regardless of how ridiculously improbable they are.
 
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