this post was submitted on 07 Apr 2024
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After years of research, Professor Mallett claims to have finally developed the revolutionary equation for time travel.

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[–] Darkard 16 points 7 months ago (1 children)

He's going to release all the details last week.

[–] taanegl 2 points 7 months ago

Remember to answer your RSVP 2 weeks ago.

[–] [email protected] 5 points 7 months ago (1 children)

if they had, we'd already know.

[–] DigitalNeighbor 7 points 7 months ago (2 children)

Good for you commenting on the title alone! If you looked at the actual article you would know that one of the limitations is, that the furthest point you can reach going back in time is when the "time machine" was first activated.

[–] voracitude 1 points 7 months ago* (last edited 7 months ago)

So, Primer. Great movie, too.

[–] [email protected] 1 points 7 months ago
[–] SkybreakerEngineer 3 points 7 months ago

Mallett’s vision for a time machine centers on what he calls “an intense and continuous rotating beam of light” to manipulate gravity. His device would use a ring of lasers to mimic the spacetime-distorting effects of a black hole.

Ring laser time navigator

[–] [email protected] 2 points 7 months ago

Signed, Dr. E.L. Brown

[–] [email protected] 2 points 7 months ago

Can only go back to when you started operating the device. So, basically the Primer time machine, except the math says it has to be done at galactic black hole amounts of energy sort of scale.

[–] [email protected] 0 points 7 months ago (1 children)

@inkican Going back in time would require more energy than is available in the universe, for going faster than the speed of light, which is impossible. That's the basis in the theory (should be called 'law' by now) of relativity.
Backwards time travel would obviously interfere with causality in creating an alternative past, which would lead to a different present. So it's a good thing that it's physically impossible, despite what a desperate astrophysicist believes.

[–] [email protected] 2 points 7 months ago (1 children)

How do we know how much energy time travel would take?

[–] FooBarrington 2 points 7 months ago (1 children)

The idea is that you can go backwards in time by going faster than light. The speed of light is actually the speed of information itself - so if you could go faster than that, you'd be going backwards in time.

However, Einstein showed that nothing can accelerate to the speed of light. You'd need infinite energy to actually reach the speed of light, and infinite energy is assumed to not be possible.

[–] [email protected] 1 points 7 months ago (1 children)

I wonder if there is a meaningful difference between your example, and the technology with which the JWST uses to view light in the past. Rather, if the later is something we can use for time travel ;)

[–] FooBarrington 1 points 7 months ago

The JWST looks at light which has been travelling for a long time. The only special thing about it, compared to other telescopes (or even your eyes), is the range of frequencies it's looking at - the longer light travels, the lower the frequency becomes (due to the expansion of the universe).

So it's the same basic phenomenon - information has a max speed, so you're always interacting with the past state of any object.