On 03-10-2019 19:44, Philip Thrift wrote:
On Thursday, October 3, 2019 at 12:39:09 PM UTC-5, Brent wrote:
On 10/3/2019 6:29 AM, Alan Grayson wrote:
Why would the energy of a branch be related to its probability of
occurrance? One can imagine a very low probability, so low that it
can't even contain copies of the experimenter. Totally ridiculous!
AG
It it's probability were zero would you still count its energy?
Brent
But MWI eliminates probabilities.
World W branches into W0 and W1, then W00, W01, W10, W11, then ...
They all exist in MWI.
Given a world (in Sabine's MWI above) W where there is a computer C
with a quantum random number generator, after C generates a string of
1000 0s and 1s, the energy of the computer
C-[one thousand (0|1)s]
in each leaf world of the resulting branching tree will be
1/(2^1000)th of energy of C.
This is a problem only if you reject the block time view and instead
support presentalism. And presentalism is rather unnatural in the MWI to
begin with because how doe you synchronize all the present moments in
the different worlds? That energy is conserved in classical physics does
not necessarily mean that the past world was somehow annihilated and all
its energy ended up in the new world. But if you believe in
presentalism, then you can interpret time evolution in this way. This
then leads to the paradox of energy conservation in the MWI. But in the
block time view energy conservation is not the result of old worlds
vanishing and new worlds coming into existence. All the worlds, old and
new exist in a timeless manner, and they have certain energy contents.
The MWI then says that one world can have many successor worlds and
obviously it's then rather natural that each successor has the same
energy as the original.
Saibal
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