what sci-fi FTL concept comes closest to theoretical FTL with our laws of physics
>>7653091
why are there so many fucking FTL threads on this board?
>>7653095
because they just recently found a way to travel faster than the speed of light, read the news
>>7653091
none of them lol! Causality, relativity, FTL, pick two.
>>7653106
lol fer sho senpai
>>7653108
Pretty much.
That said wormholes and the acubirre drive are the only technically possible options we haven't totally ruled out I believe.
>>7653106
No they havent and that rod idea doesn't work.
>>7653106
This is so stupid it doesn't even count as trolling. It's just a false statement.
>>7653148
I love how people think that a civilization that build the first flying machine a century ago knows everything there is about physics and how universe really works.
>>7653106
>muh continuum hypothesis
kek, retard.
>>7653179
greys pls you havent even invented clothes
>>7653179
>you can't prove it doesn't work!
Go away that's not an argument.
Quantum tunneling
>>7653106
That footnote really shows why this hypothesis doesnt work.
>>7653106
The rod would bend, even if it was made of diamond it would bend.
>>7653179
What civilization has done better than us so far? Hypothetical aliens don't count.
Also I acknowledged that there are 2 methods we still haven't ruled out so even with our current understanding of things there's a remote possibility of it and of course we could always make some crazy discovery that turns everything we know on it's head. I wouldn't bet money on it though.
>>7653286
would the rod still bend if it were 5 lightyears in diameter too?
What if light in a vacuum is traveling through some sort of cosmic relativity soup which limits it's max speed. Sort of like terminal velocity of a falling object. That would mean objects which don't react with matter, like neutrinos, would be less effected by this relativity soup or put another way would have less relative drag. We've actually observed neutrinos moving faster than the speed of light. Maybe studying neutrinos could gleam some insights on FTL travel.
>>7653148
wormholes and alcubierre drive can violate causality. You also forgot about the Krasnikov tube.
https://en.wikipedia.org/wiki/Krasnikov_tube
The Krasnikov tube presents no problems with causality or relativity so long as there is only one krasnikov tube. This is because Krasnikov tube is one way trip only.
Krasnikov is fucking based and you should read his papers. He has shown that even with limitations on what negative energy densities are possible(quantum inequalities), we can still make wormholes and warp drives using negative mass energies that aren't totally ridiculous.
>>7653179
with flying machines we had proof that they were possible with birds, with FTL we have no such proof.
>>7653476
I know they would violate causality but they are none the less technically possible on paper that's why I mentioned them. I don't believe they will work but we can't say for sure they don't work currently.
I'll check that guy out sounds cool.
>>7653476
>Krasnikov_tube
I saw a video which described a time travel machine which could send a one or a few photons back in time. It relied on the idea of light having or generating gravity. Basically you'd need lots of extremely high powered lasers that are extremely powerful. Arranged in a way so they form a square or circle then stacked ontop of each other so they form a tall square or circle shaped tube. You could send a few photons down this tube and due to the gravity they generated they would travel back in time, in theory. I don't remember much about it but hopefully someone knows what it's called cause I'd love to read more about it. I don't think it was a Krasnikov .tube
>>7653106
super subtle b8. i r8 it 8.8/8
>>7653179
>I love how people think that a civilization that just found out the earth is sphericala few thousand years ago knows about galaxies and stars
>>7653466
How do you build a spaceship out of neutrinos?
>>7653466
The faster than light neutrinos discovery was falsified as the equipment used malfunctioned.
>>7653353
Duh, force doesn't travel through an object faster than the speed of light.
The rod would compress at some level, especially if you made it massive. The more massive it became the more force you would need to apply to it to "transmit" a message.
What if you made a light year long chain of nanoscale gears and turned the first gear?
>>7653148
How does warp violate causality or relativity?
>>7654201
No. Mechanical forces propagate through matter like sound waves it won't move FTL, before you even come close that shit will fall apart.
Also if you wanted to communicate with someone 1 million light years away could you set up your gear train faster than light? If not then what good is it?
>>7654207
It doesn't violate relativity in fact GR is the very thing that makes it possible at least on paper.
That said if SR/GR as we currently know them are true then any method of FTL must confront the issue of "arriving before you left". Whether you use a warp drive or a wormhole or some how accelerate beyond light speed there will be some frames of reference where you arrived at your destination before starting your trip.
That said maybe causality violations are just fine. Common experience tells us we can't violate causality but maybe it actually happens all the time and we don't notice it or maybe relativity is flawed in some way or maybe FTL travel methods only work under some weird highly specific conditions that won't cause causality violations somehow.
There are numerous remote possibilities but FTL travel doesn't seem likely.
>>7654197
So what? They cant travel faster than the speed of light
>>7653500
That's the black science guy's theory for time travel (not worth remembering his name). His only motivation to succeed with time travel is to see his dead dad.
>>7653106
Does the force of gravity propagate instantly or at the speed of light?
If it's instant, couldn't the "sender" manipulate gravitational forces which affect the instruments on the "receiver" end on a very very very small scale and piece together a message?
>>7654835
>https://en.wikipedia.org/wiki/Krasnikov_tube
Gravity propagates at the speed of light.
