(urth) Travelling North aka miscellaneous thoughts on Wolfe

[brunians at brunians.org]

Cool.

.

> That is incorrect. Some quantities might become imaginary but that is a
> mathematical artefact.
> The real point is, if you combine faster than light travel and Lorentz
> invariance of the laws of physics (the invariance principle that is the
> basis of Einstein's theory of special relativity), then you can indeed
> have trajectories which connect two arbitrary points of spacetime i.e.
> in a given reference frame it will look like you can move freely forward
> or backwards in time (you're not going ``straight'' into the past --
> you're making little loops, like travelling to a distant star faster
> than light and then coming back the same way).
>
> On 06/10/2010 03:45 PM, Jack Smith wrote:
>>
>>
>>     It is also not clear that moving faster than the speed of light
>>     would allow you to go backward in time.   If the mathematics of
>>     the relativity equations correctly describes reality, then a
>>     velocity greater than the speed of light puts you not into
>>     negative time but into imaginary time.
>>
>>
>
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