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Andrew Clough wrote:
> >
> >How could you communicate with the past. Causality is not violated even
> >when light speed limits are in entanglement.
>
> I'm not sure what you mean by that last part of that last sentence: "Light
> speed limits are in entanglement." I didn't think physical constants like
> c, permitivity, and permeability could be entangled.
Sorry, I missed a comma. Entanglement creates violation of light speed
limits. Just because I signalled someone instantaneously 1 light year
away with an entangled pair doesn't mean that they can communicate with
me in my past with the same signal. If they turned around immediately
after I signalled them and sent it back instantaneously, their signal
would still arrive after I had sent my first signal. No communicating
with the past.
>
> Anyway, I can see a way to communicate with the past using instantaneous
> communication. First, send the message to your past self to a friendly
> probe/alien/space craft Very Far Away.
And just how would this occur?
> Next, have this second party change
> their velocity be a Good Deal. This will change what is considered
> "simultaneous" with them. (Actually, I believe non-local simultaneity is no
> longer a valid concept because of this, much like absolute frames of
> reference.) They can then be simultaneous with you past self, and can
> relay the message to him or her.
These ideas about communicating with the past via exceeding light speed
are a misperception caused by too much Star Trek watching.
There is an absolute frame of reference in at least one dimension. For
example, we all know the Big Bang occured at some point in the past.
Temporally speaking, therefore, we can all deal relativistically with
each other in reference to the Big Bang event, so in the dimension of
time, there IS an absolute frame of reference. This is essentially what
occurs when we are x many light years from each other. We may experience
more time than others due to our relative veolcities (even then, the
rate of temporal passage occurs in reference to actual zero velocity.
This is an interesting question to ask: Just what frame of reference
results in the fastest possible passage of time? Is this determined by
the velocities of the majority of the matter in your local region, your
galactic arm, or your galaxy? If all matter in the universe is screaming
away from all other matter, which one has the frame of reference with
the fastest possible passage of time?)
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