11 The Time Tourist Problem for Wormholes
OK, now for a change of topic: time travel. In this podcast, I question Paul Davies' response to the "time tourist" objection to the possibility of time travel. In How to Build a Time Machine he says that "it is not possible to use a wormhole to visit a time before the wormhole was constructed". I think this explanation is incoherent. Can someone explain what he means, or am I right?
This podcast experiments with format a bit, using a musical theme to introduce and indicate the end of the podcast, and with an announcement of the podcast series, number and title at the beginning. I won't always be able to do this kind of production, perhaps, but why not do it when I can, if it can be done quickly?
Podcast 11: The Time Tourist Problem for Wormholes (9 min 47 sec @ 48 kbps)
This podcast experiments with format a bit, using a musical theme to introduce and indicate the end of the podcast, and with an announcement of the podcast series, number and title at the beginning. I won't always be able to do this kind of production, perhaps, but why not do it when I can, if it can be done quickly?
Podcast 11: The Time Tourist Problem for Wormholes (9 min 47 sec @ 48 kbps)
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2 Comments:
If the wormhole is created at X interval then that is its constraint in regards to time.
Think of time as linear, but backward compatible.
I guess it all depends on the way the wormhole machine is constructed. I don't know about Paul Davies explanation, just heard what you say about it. To me, it seems as if the wormhole machine is built as a differential machine, linking two ends. As the machine is built from "our time", the ends can only be specified as a "now end" and a "future end", therefore preventing the backward time travelling (meaning: going from the future end to the now end) to moments located before the built moment.
Therefore, yes, you're not getting it. Or at least, not asuming that way of constructing the "wormhomle time travel machine"
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