Re: multiverses and quantum computers

Fri, 01 Feb 2013 23:39:54 -0800 

On 2/1/2013 12:46 AM, Telmo Menezes wrote:

Hi Bruno,
On Thu, Jan 31, 2013 at 4:15 PM, Bruno Marchal <[email protected] <mailto:[email protected]>> wrote: 


    On 31 Jan 2013, at 15:15, Roger Clough wrote:


    Hi Telmo Menezes
    Perhaps you're right, but to my limited knowledge,
    a quantum has infinite paths available between
    points A and B without invoking another universe.


    Once we are able to use (classical) information obtained in the other 
quantum paths,
    like when doing a Fourier transform on  some superposition of many 
computations,
    like in a quantum computer, what makes them different of other universes?
The superposition of many computations itself. Superposition of states on a same universe are a bit hard to swallow. I think people reject the idea of a multiverse because it sounds loony, but my understanding is that making QM consistent with a single universe requires magical thinking.
I don't think that's true. There are ways of interpreting QM that are consistent and not "magical". It's just that they require accepting that somethings happen and some don't. 



It's the same as saying that consciousness emerges from neural activity.
But we don't know of any consciousness that doesn't emerge from neural activity and we don't know of any intelligence that doesn't emerge from the physical processing of information. 

Brent
People overlook the magical step because they are more confortable with the resulting model. 


    Bruno




    So no problem.

        ----- Receiving the following content -----
        *From:* Telmo Menezes <mailto:[email protected]>
        *Receiver:* everything-list <mailto:[email protected]>
        *Time:* 2013-01-31, 08:13:30
        *Subject:* Re: Re: About the Infinite Repetition of Histories in Space

        Hi Roger,

        In the one universe model, where does the extra computational power of 
quantum
        computers come from?


        On Thu, Jan 31, 2013 at 2:09 PM, Roger Clough <[email protected]
        <mailto:[email protected]>> wrote:

            Hi Telmo Menezes
            　
            IMHO more than one universe is unjustified.
            　
            　

                ----- Receiving the following content -----
                *From:* Telmo Menezes <mailto:[email protected]>
                *Receiver:* everything-list 
<mailto:[email protected]>
                *Time:* 2013-01-30, 12:10:08
                *Subject:* Re: About the Infinite Repetition of Histories in 
Space

                Hi Roger,

                I find it harder to believe in finite universes. Why the precise
                number, whatever it is?


                On Wed, Jan 30, 2013 at 12:46 PM, Roger Clough 
<[email protected]
                <mailto:[email protected]>> wrote:

                    Hi Stephen P. King
                    It's easier to believe in salvation through faith or UFOs 
than
                    infinite universes.

                        ----- Receiving the following content -----
                        *From:* Stephen P. King <mailto:[email protected]>
                        *Receiver:* everything-list
                        <mailto:[email protected]>
                        *Time:* 2013-01-28, 09:20:33
                        *Subject:* About the Infinite Repetition of Histories 
in Space

                        Hi,

                        牋 I think this paper might be fodder for a nice 
discussion!


                        http://arxiv.org/abs/1301.5295


                          About the Infinite Repetition of Histories in Space

                        Francisco Jos Soler Gil
                        
<http://arxiv.org/find/physics/1/au:+Gil_F/0/1/0/all/0/1>,Manuel Alfonseca
                        
<http://arxiv.org/find/physics/1/au:+Alfonseca_M/0/1/0/all/0/1>
                        (Submitted on 22 Jan 2013 (v1
                        <http://arxiv.org/abs/1301.5295v1>), last revised 23 
Jan 2013
                        (this version, v2))

                            This paper analyzes two different proposals, one by 
Ellis
                            and Brundrit, based on classical relativistic 
cosmology,
                            the other by Garriga and Vilenkin, based on the DH
                            interpretation of quantum mechanics, both of which 
conclude
                            that, in an infinite universe, planets and living 
beings
                            must be repeated an infinite number of times. We 
point to
                            some possible shortcomings in the arguments of these
                            authors. We conclude that the idea of an infinite
                            repetition of histories in space cannot be 
considered
                            strictly speaking a consequence of current physics 
and
                            cosmology. Such ideas should be seen rather as 
examples of
                            {\guillemotleft}ironic science{\guillemotright} in 
the
                            terminology of John Horgan.
-- Onward! 

                        Stephen

                    
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