On 5/4/2018 5:33 PM, agrayson2...@gmail.com wrote:
On Friday, May 4, 2018 at 9:44:49 PM UTC, Brent wrote:
On 5/4/2018 12:07 PM, agrays...@gmail.com <javascript:> wrote:
Unfortunately, it is not the case that you can implement
absolutely any unitary transformation in this way. For
instance, you cannot implement the unitary transformation
that would reverse a totally decohered event.
*If the decoherence was unitary, why can't the process be
reversed statistically, analogous to the case of the classical
cooling gas where we imagine the hugely improbable incoming and
absorption of the previously outgoing IR photons? AG*
It's mathematically reversible, but it's not reversible by you or
any combination of powers in this world no matter how magical
because this world is orthogonal to other worlds that contain the
information you would need to reverse it. Which is why I suggested
this be called nomologically irreversible.
Brent
*I don't buy this argument. Since those other worlds don't exist, one
cannot speak of information lost to them. AG
*
Then you can adopt the "disappearing worlds" interpretation and banish
them. But then you're faced with the CI problem of exactly when and why
they vanish.
Brent
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