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Time is a dimension, but not like space

(bigthink.com)
171 points belter | 3 comments | 17 Oct 24 15:29 UTC | HN request time: 0.553s | source
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heed ◴[20 Oct 24 05:48 UTC] No.41893173[source]▶
Also consider the speed of light is also the speed of causality. If there was no such limit it means it would be possible for effects to precede causes which would lead to a very different kind of universe!
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Etheryte ◴[20 Oct 24 17:49 UTC] No.41897144[source]▶
The possibility of delays being zero does not imply that negative delays are possible.
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cjfd ◴[20 Oct 24 17:53 UTC] No.41897162[source]▶
Actually, it does. Because of relativity events that occur at the same time in one frame of reference do not occur at the same time in another. A delay of zero between two different points implies that there is a reference frame where the delay is negative.
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1. Etheryte ◴[20 Oct 24 18:44 UTC] No.41897555[source]▶
I'm not sure that holds when you take the speed of light to be infinite. Depending on which end you look at it, you'll either be dividing by zero or having infinite energy, so I don't think relativity the way we understand it would still make sense in any way.
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2. cjfd ◴[21 Oct 24 06:41 UTC] No.41901306[source]▶
Well, it is quite well known what you get when taking the speed of light to infinity. It is classical mechanics.
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3. Etheryte ◴[21 Oct 24 09:33 UTC] No.41902265[source]▶
Point being, in that case you don't have relativistic effects nor effects preceding causes and whatnot.