Re: Variations in the MWI multiverse

"Lee Corbin" <[email protected]> Mon, 10 Mar 2014 21:03:12 -0700
Newsgroups gmane.science.physics.fabric-of-reality
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Gary writes

> vastly less probable than ours (say, all the same as ours but that it 
> includes a giant space duck)

Instead of the space duck, I prefer the well-known "elephant in the room" 
that everyone is always missing. I'm comforted by the thought that at least 
in some worlds, according to MWI, people aren't missing it at all, and 
indeed can't help but notice it.

> ...the multiverse is very, very, very big.  So far I don't think you're 
> saying anything controversial.

Thanks for the reality check.
And while I may be guilty of using a new acronym, "GIU", people should 
remember that the phrase "group of identical universes" occurs over and over 
in the book "Fabric of Reality".

It's hard to break the habit many people so often exhibit, of believing that 
a quantum experiment must be performed in order to cause a branching to 
occur:

Proceeding, following the example of there being approximately as many 
universes with large Neptunes as small Neptunes, and that this holds true 
for each particular Earth, it also follows that when you flip a coin, there 
are approximately as many otherwise identical Earths in which heads comes up 
as tails. This is so despite the trajectory of any coin leaving your hand 
being classical, for the tiny differences in air currents and tiny initial 
differences in angle or orientation of the coin, the rest of the Earth is 
"orthogonal", that is, in the quantum multiverse there are approximately as 
many otherwise identical Earths that have a room with this kind or that kind 
of air currents, orientations, etc.

The upshot of all this is that when you flip a classical coin, you still 
find yourself in each kind of universe, the ones showing heads and the ones 
showing tails, exactly as if a quantum "split" had occurred.

Application: suppose that we place a six-sided die in a wooden box, close 
the lid, and shake the box vigorously. We then allow the die to rest quietly 
in the closed box for several seconds on a table top, which is enough time 
for any (unwarranted) concerns about decoherence to be allayed. Then the set 
of absolutely identical yous watching the box will be split into six 
approximately equal portions when you open the box and look to see how the 
die has landed.

Conclusion: when a number of possibilities seem present, as in the case of 
the box containing a die in an unknown state, and you place a bet that the 
die has taken on a particular value, "you can't beat the odds!".  Which is 
to say that even after looking at the die, you should acknowledge that you 
are seeing all six values approximately equally, in six kinds of parallel 
worlds.

Lee


On Sun, Feb 23, 2014 at 1:08 AM, Lee Corbin <[email protected]> wrote:

Consider the set, across the multiverse according to MWI, of solar systems
essentially similar to ours. This set is much vaster (or, perhaps, we should
say, has greater measure or frequency) than the GIU (Group of Identical
Universes) exactly identical to ours.


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      <p>Gary writes<br>
<br>
&gt; vastly less probable than ours (say, all the same as ours but that it <br>
&gt; includes a giant space duck)<br>
<br>
Instead of the space duck, I prefer the well-known &quot;elephant in the room&quot; <br>
that everyone is always missing. I&#39;m comforted by the thought that at least <br>
in some worlds, according to MWI, people aren&#39;t missing it at all, and <br>
indeed can&#39;t help but notice it.<br>
<br>
&gt; ...the multiverse is very, very, very big.  So far I don&#39;t think you&#39;re <br>
&gt; saying anything controversial.<br>
<br>
Thanks for the reality check.<br>
And while I may be guilty of using a new acronym, &quot;GIU&quot;, people should <br>
remember that the phrase &quot;group of identical universes&quot; occurs over and over <br>
in the book &quot;Fabric of Reality&quot;.<br>
<br>
It&#39;s hard to break the habit many people so often exhibit, of believing that <br>
a quantum experiment must be performed in order to cause a branching to <br>
occur:<br>
<br>
Proceeding, following the example of there being approximately as many <br>
universes with large Neptunes as small Neptunes, and that this holds true <br>
for each particular Earth, it also follows that when you flip a coin, there <br>
are approximately as many otherwise identical Earths in which heads comes up <br>
as tails. This is so despite the trajectory of any coin leaving your hand <br>
being classical, for the tiny differences in air currents and tiny initial <br>
differences in angle or orientation of the coin, the rest of the Earth is <br>
&quot;orthogonal&quot;, that is, in the quantum multiverse there are approximately as <br>
many otherwise identical Earths that have a room with this kind or that kind <br>
of air currents, orientations, etc.<br>
<br>
The upshot of all this is that when you flip a classical coin, you still <br>
find yourself in each kind of universe, the ones showing heads and the ones <br>
showing tails, exactly as if a quantum &quot;split&quot; had occurred.<br>
<br>
Application: suppose that we place a six-sided die in a wooden box, close <br>
the lid, and shake the box vigorously. We then allow the die to rest quietly <br>
in the closed box for several seconds on a table top, which is enough time <br>
for any (unwarranted) concerns about decoherence to be allayed. Then the set <br>
of absolutely identical yous watching the box will be split into six <br>
approximately equal portions when you open the box and look to see how the <br>
die has landed.<br>
<br>
Conclusion: when a number of possibilities seem present, as in the case of <br>
the box containing a die in an unknown state, and you place a bet that the <br>
die has taken on a particular value, &quot;you can&#39;t beat the odds!&quot;.  Which is <br>
to say that even after looking at the die, you should acknowledge that you <br>
are seeing all six values approximately equally, in six kinds of parallel <br>
worlds.<br>
<br>
Lee<br>
<br>
On Sun, Feb 23, 2014 at 1:08 AM, Lee Corbin &lt;[email protected]&gt; wrote:<br>
<br>
Consider the set, across the multiverse according to MWI, of solar systems<br>
essentially similar to ours. This set is much vaster (or, perhaps, we should<br>
say, has greater measure or frequency) than the GIU (Group of Identical<br>
Universes) exactly identical to ours.<br>
<br>
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