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brought against the Boltzmann brain hypothesis…
I have been reading lots of physics lately about how universe came into being. One idea is that universe is long gone (thermal death) and it might not exist the way I feel it and I am a sequence of fluctuating into existence over incredibly long amounts of time which makes me experience my past and present, and the brains that will be quantum fluctuated will be my future.
There are possible universes with Boltzmann brains just like yours where there are zero real brains like yours throughout the entire space and time of that universe. So your opinions don't tell you the way the universe is.
has to be the Boltzmann brain hypothesis ..
To take the probability of entropy decrease needed to fluctuate one brain then to take probability of entropy decrease needed to fluctuate visible universe
To compute a probability you need a sample space from which to draw. My point was where does the sample space come from. If the sample space comes from a brain, then Boltzmann brains with totally wrong opinions will draw up their own sample spaces and compute their own, wrong, probabilities based on the totally wrong sample spaces. You could have a universe with five forces that has a Boltzmann brain with your exact opinions including you thinking there are four forces. And your brain would have an opinion about what the visible universe looks like and it could be very very very wrong.
Zesty Universes that spawn 'cosmic brains' should go on the scrapheap
So that includes arrangements of weird stuff satisfying totally different laws. After all you can imagine a universe that follows our laws but fluctuates a brain that has a memory consistent with a totally Newtonian universe. So your opinions could be totally wrong opinions and a fluctuation in a vastly more complicated universe.
If you imagine that your brain's opinion are correct. And then you compute that if they are correct that the universe is full of many Boltzmann brains then you might reasonably wonder whether you are, in fact, a Boltzmann brain. However even if you computed how many Boltzmann brains there are like you given that there is one real brain like you that correctly sees the universe and is full of true facts. It doesn't really matter how big or small that ratio is. Because you have no idea the probability that there is a real brain like yours given that you are a Boltzmann brain.
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ShtetlOptimized » Blog Archive » Ask Me Anything
The problem with the calculation is that it depends a lot on the underlying assumptions. Once you assume that Boltzmann brains are plausible, restricting the calculation to our brain structure and our current model of the universe seems absurd. What should be computed is the probability over all possible universes and all possible structures that give rise to consciousness. The problem is, that we cannot currently ever compute something more simple than that, which is the likelihood of our current universe, even is we restrict ourselves to computable universes (for general noncomputable universes there is not even a meaningful measure of probability). For a more detailed discussion you can start with
06/05/2013 · 292 Responses to “Ask Me Anything
Your brain might not even be large enough to conceptualize even the most superficial description of the actual universe and so your computations of the probabilities of generating a brain like yours in a universe like that might be impossible. But even if it were possible there is no way to assign a sample space for having these different kinds of real universes.
Tenure Edition” wolfgang Says: Comment #1 May 6th, 2013 at 9:44 am
We could try science and have it not work. And it would be a cause for concern if that happened. And we might worry in that case that we are a Boltzmann brain. Or we could work hard to be the first physicist to make sense of a reality that is real. It is just pessimism versus optimism. Not really probability theory.
Forcing Anthropics: Boltzmann Brains  Less Wrong
But each brain could try to imagine a universe where it's ideas are correct ideas. That is, in fact, what we do. We try to come up with models where the facts in our brains are correct. If we failed, that would be the true failure.
07/09/2009 · Forcing Anthropics: Boltzmann Brains ..
However, if the same model predicts vastly more Boltzmann brains super different than you (including Boltzmann brains that have totally wrong ideas about the universe) then the fact that you are one of the brains with correct ideas should mean something.
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