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Time Travel

Poll: So what do you think of it?
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That is excellent!
15.38%
 2 15.38%
It's fairly good.
0%
 0 0%
Average.
0%
 0 0%
Not that good.
0%
 0 0%
It sucks!
15.38%
 2 15.38%
It has good theories behind it, but needs some work.
61.54%
 8 61.54%
Other?
7.69%
 1 7.69%
Total 13 vote(s) 100%
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Time Travel
Thecla Offline
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#44
06-01-2003, 01:20 AM
Quote:No, it does not. It does not address that question at all. What it does say is that mass is a form of energy.

Well, some form of conservation of energy is a consequence of Einstein' general theory of relativity: the Einstein field equations (G = Einstein curvature tensor, T = energy-momentum tensor):

G = 8 pi T

impy that Div T = 0 (via the Bianchi identities), which is a form of energy-momentum conservation; but energy is a particularly subtle concept in general relativity, because the energy of the gravitational field cannot be localized. In special relativity (flat space-times), or classical mechanics, conservation of energy is much more straightforward, and in all cases it's connected with the fundamental concept (via Noether's theorem) of the invariance of the laws of nature under time translations.

Kurt Godel's solution of the Einstein field equations showed that general relativity allows universes in which time travel can occur, though whether it can really happen, who knows?
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Messages In This Thread
Time Travel - by Obi2Kenobi - 05-23-2003, 04:26 AM
Time Travel - by Kryn - 05-23-2003, 04:42 AM
Time Travel - by Kasreyn - 05-23-2003, 05:21 AM
Time Travel - by yangman - 05-23-2003, 05:47 AM
Time Travel - by WarLocke - 05-23-2003, 05:52 AM
Time Travel - by TaMeOlta - 05-23-2003, 11:08 AM
Time Travel - by --Pete - 05-23-2003, 01:52 PM
Time Travel - by kandrathe - 05-23-2003, 05:20 PM
Time Travel - by ShadowHM - 05-23-2003, 06:48 PM
Time Travel - by gekko - 05-23-2003, 07:23 PM
Time Travel - by gekko - 05-23-2003, 07:29 PM
Time Travel - by Sheep - 05-23-2003, 08:00 PM
Time Travel - by ithil - 05-23-2003, 08:26 PM
Time Travel - by Taem - 05-23-2003, 08:52 PM
Time Travel - by Obi2Kenobi - 05-23-2003, 09:08 PM
Time Travel - by Mikedok - 05-23-2003, 09:57 PM
Time Travel - by Swarmalicious - 05-23-2003, 10:07 PM
Time Travel - by --Pete - 05-23-2003, 11:16 PM
Time Travel - by --Pete - 05-23-2003, 11:31 PM
Time Travel - by Kasreyn - 05-23-2003, 11:35 PM
Time Travel - by Obi2Kenobi - 05-24-2003, 12:05 AM
Time Travel - by gekko - 05-24-2003, 12:21 AM
Time Travel - by --Pete - 05-24-2003, 12:42 AM
Time Travel - by Guest - 05-24-2003, 01:23 AM
Time Travel - by Albion Child - 05-24-2003, 01:31 AM
Time Travel - by channel1 - 05-24-2003, 01:34 AM
Time Travel - by gekko - 05-24-2003, 01:37 AM
Time Travel - by --Pete - 05-24-2003, 01:40 AM
Time Travel - by --Pete - 05-24-2003, 01:49 AM
Time Travel - by gekko - 05-24-2003, 01:55 AM
Time Travel - by channel1 - 05-24-2003, 02:26 AM
Time Travel - by Mikedok - 05-24-2003, 02:29 AM
Time Travel - by rholst1 - 05-24-2003, 02:39 AM
Time Travel - by --Pete - 05-24-2003, 02:25 PM
Time Travel - by --Pete - 05-24-2003, 03:14 PM
Time Travel - by whyBish - 05-25-2003, 05:22 AM
Time Travel - by kier - 05-25-2003, 06:23 PM
Time Travel - by whereagles - 05-29-2003, 02:04 PM
Time Travel - by --Pete - 05-29-2003, 02:29 PM
Time Travel - by Occhidiangela - 05-29-2003, 05:02 PM
Time Travel - by whereagles - 05-29-2003, 05:17 PM
Time Travel - by kandrathe - 05-29-2003, 05:50 PM
Time Travel - by Kartoffelsalat - 06-01-2003, 12:24 AM
Time Travel - by Thecla - 06-01-2003, 01:20 AM
Time Travel - by Vandiablo - 06-01-2003, 05:41 AM
Time Travel - by --Pete - 06-01-2003, 06:46 AM
Time Travel - by Thecla - 06-01-2003, 09:10 AM
Time Travel - by Kartoffelsalat - 06-01-2003, 01:42 PM
Time Travel - by Vandiablo - 06-01-2003, 02:07 PM
Time Travel - by --Pete - 06-01-2003, 03:33 PM
Time Travel - by --Pete - 06-01-2003, 03:44 PM
Time Travel - by Mark - 06-02-2003, 01:38 PM

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