In a message dated 10/30/00 1:28:58 PM, firstname.lastname@example.org writes:
>There have been a bunch of physics articles about time machines over the
>few decades. They clearly show that time machines are not logically
>impossible, though it is not yet clear whether or not they are physically
>possible with standard physics. Here's one reference:
Yes, but the proposed time travel models do not allow the past to be
*changed*. If a future event causally affects a past event, that past
event was always altered. It's similar to a micro-time-travel
model that Hawking used for predictions on black hole radiation .
The current models agreed that changing the past creates paradox,
and demonstrated that in certain limited worlds you could have time
travel that didn't change the past.
This archive was generated by hypermail 2b30 : Mon May 28 2001 - 09:50:19 MDT