X-Message-Number: 22167
From: 
Date: Wed, 9 Jul 2003 12:23:54 EDT
Subject: Re: CryoNet #22154 Is time travel impossible

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From david Pizer:
> 
> One example this professor used a lot is the impossibility of going back in 
> time. The example he gave is that, if two-way time travel were possible, one 
> could go back in time and kill his/her mother, at a time before that one was 
> conceived.  But if that happened then that one would never have been born.   
> If the one person's mother died before he/she was conceived, then that one 

> person did not exist and could not go back in time and kill his mother.   This
> example was his "rock solid" example of why time travel is impossible.

I think the time travel concept has a fundamental flaw: On a side, using 

thermodynamical arguments it can be proven that the information content in a 
given 
volume is limited by the exterior surface of that volume, this is the 

so-called holographic principle. On the other side, W. Israel has been the first
to 

point that if a object falling in a black hole undergoes some drag force (it is
no in free fall) then it see a blue shifted version of the Hawkings radiation 
and the mass of this one is equal to the cube of the BH radius counted in 
Planck's unit.

This is not mere theory, the MECO (magnetospheric eternaly collapsing object) 
effect tells us that every mass has an infinite set of inertial frames where 
it looks as a BH with a strong drag force. think for example about the Earth: 
If there was no pressure force it would collapse into a 1.5 cm radius BH, but 
at MECO level the Hawkings radiation would have multiplied its mass by a 
factor near 10^66, the BH surface would be then larger than the observable 
universe.

In our low speed (that is, far away from MECO) frame, the world is reducible 
to a 2d domain, at MECO it turns full 3d and is far larger. If you think about 
time travel, one way or another you have to enter the MECO domain and its big 
world. So don't expect to see time travelers: They can't keep on the same 2d 
domain, so you wouldn't see them as people or machines, they would look as a 

MECO 3d effect because their own holographic sheet would be tilted as seen from
our own.

Assume at some epoch you master time travel and want to go back: You have 

10^66 tilt position to chose from at a given epoch to look "holographic" in this
epoch sheet, that is why we don't see anything we can identify with time 

travel, even if it is very common in 3d. Real time travelers wouldn't bother 
about 
2d holographic sheet and move only in 3d, for us, it would looks as a nearly 
infinite superposition of parallel universes, each with a different history.

Yvan Bozzonetti.

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