11–20 of 39 posts
>"Because time travel is limited to these special particles, it is not possible for a man to travel back in time and murder one of his parents before he himself is born, for example. However, if scientists could control the production of Higgs singlets, they might be able to send messages to the past or future," This is absurd. If you can send messages back in time, then someone can build a robot that can accept mess…
I hate judging based on stupid journalist writeups of stuff like this, so I'll actually look through the article, for once.
The first part of the abstract: "We construct a simple class of compactified five-dimensional metrics which admits closed timelike curves (CTCs), and derive the resulting CTCs as analytic solutions to the geodesic equations of motion. The associated Einstein tensor satisfies the null, weak, strong and dominant energy conditions; in particular, no negative-energy "tachyonic" matter is required."
Translated for the layman: "We completely arbitrarily and quite deliberately construct a geometry that allows normal particles to time travel. It turns out that under this geometry, if a particle time travels, it doesn't have to be abnormal."
Let's just say I'm not impressed so far...we'll see how the rest of the article goes...
This is just silly. If time travel were possible, it would have been invented already in the future and our world would be a very different place.
>"Because time travel is limited to these special particles, it is not possible for a man to travel back in time and murder one of his parents before he himself is born, for example. However, if scientists could control the production of Higgs singlets, they might be able to send messages to the past or future," This is absurd. If you can send messages back in time, then someone can build a robot that can accept mess…
That's only true if "free will" exists, i.e. if its really "changing" the past instead of fulfilling it.
Why do people bother researching into time travel? Even if it's possible, it's potentially a massively dangerous act. Nobody should have the power to alter events outside of the present in any way, shape or form. Period.
> events outside of the present I hate to break this to you, but there's no such thing that you can describe as simply as "the present". Since we're talking about time travel here, it's important to remember that relativity is real, and that every single atom in your body exists at a different "present". Our GPS satellites are time travellers. Their distance away from Earth is so great that we must compensate for the…
The difference is, there is no chain reaction in RTGs; the natural spontaneous fission is relied on. The construction (lack of neutron moderator) prevents chain reaction for safety reasons -- no chance of runaway reaction. On the other hand, it means the thermal output cannot be regulated at all, and drops steadily in parallel to the half-decay time.
The RTGs are so safe they even used miniature ones in some heart pacemakers implanted years ago; they are still going [1].
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This is just silly. If time travel were possible, it would have been invented already in the future and our world would be a very different place.