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So the tl;dr is:
0. nothing in relativity suggests that spacetime cannot contract or stretch faster than light
1. nothing in physics says energy density can’t be negative
So all you have to do is both of those things, and Hey, Presto! FTL travel!
I feel I should point out the slightly bleeding obvious flaw in the reasoning -- the fact that no-one says that something can't happen doesn't mean that it can!
Often, if no-one says something can happen, it's because it can't. In this instance, for example, we use abstract determiners that were invented by people to quantify things (it's quite common to call them "numbers").
When working with numbers, it's really easy to make stupid suppositions, because the real world doesn't force numbers to behave like the non-abstract things that the numbers represent.
E.g. for point 1, solve this:
If you have five pounds of potatoes, and someone steals eight pounds of potatoes from you, how many pounds of potatoes are you left with?
Easy, no?
You've got -3 pounds of potatoes.
Now perform the experiment with real potatoes, rather than abstract quantifiers (those "number" things, again), and send me a photo of what -3 pounds of potatoes looks like.
The only difference between doing this with potatoes and doing it with "energy density" is that if you do it with "energy density", and act all clever and intellectual, some people won't realise that you're a bleeding idiot.
I wanna be a eunuchs developer! Pass me a bread knife!
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Just because you can't photograph it, does't mean that -3 pounds of potatoes isn't "real" - that's the idea that banking is based on; heck my bank account relied on it for years after I got out of Uni and trust me, I was assured often enough that that was for real! 
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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So if I invite you round for dinner, and I tell you that you'll be having -1 steak, it means that you'll have to bring a steak and give it to me, and then you don't eat?
OK, I can get behind that.
I hereby invite every member of CP to my place, to have -2 beers!
I wanna be a eunuchs developer! Pass me a bread knife!
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Regrettably, I'm busy that day so I will have to decline your invitation. If you are in the area feel free to drop in for -2 bottles of wine. 
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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0 - spacetime is already expanding faster than the speed of light, we know that!
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So we just need to grab the expansion handles, and let it drag us!
Now that's a good theory!
I wanna be a eunuchs developer! Pass me a bread knife!
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Super Lloyd wrote: 0 - spacetime is already expanding faster than the speed of light, we know that!
Is it, really, today?
I know that it was in the old days, back in the inflation period, but I thought it had calmed down since.
(I certainly am not an astrophysicist, so I am asking out of curiosity.)
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That sure is a fascinating website. Thanks for the link!
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For sub-atomic spacecraft?
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Now if we could just get transporting to work. I have a list of people they can use for alpha testing.
Got my site back up after my time in the woods!
JaxCoder.com
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Mike Hankey wrote: Now if we could just get transporting to work. I have a list of people they can use for alpha testing.
Personally, I have a list of people for all the tests where the transporter doesn't yet quite work. As in, it'll convert matter to energy, but we're still perfecting the energy back to matter part.
Latest Article - Slack-Chatting with you rPi
Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny
Artificial intelligence is the only remedy for natural stupidity. - CDP1802
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Why are they writing that today?!
Nothing new here.... 
I google that topic every few month and was hoping for a moment for something new, haha!
FYI, there is also a theoretically much "cheaper" version of Alcubierre drive, i.e. requiring much less energy.
Missing the point | New Scientist
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Super Lloyd wrote: there is also a theoretically much "cheaper" version of Alcubierre drive, i.e. requiring much less energy.
Designed by someone who had drunk to many alcopops?
But the alcobeer drive still needs negative potatoes, so it's like saying "If I could make rainbow sparkles come out of my fingers, I'd become a pop star!"
Spend your creative energy on something that doesn't require a magic unicorn engine to power it.
I wanna be a eunuchs developer! Pass me a bread knife!
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My first two wives were excellent at it. That’s why I am now in a small one bedroom apartment.
Socialism is the Axe Body Spray of political ideologies: It never does what it claims to do, but people too young to know better keep buying it anyway. (Glenn Reynolds)
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Zsa Zsa Gabor said it first. 
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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I do what I can and can iron.
Walk her dog
Go get the groceries
Do the laundry
Cook 1/2 the time
Clean up din din 3/4 time
She did most of this stuff when I was young, in bands and stupid.
So I'm making it up to her.
She deep cleans the house. (I hate that)
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17. Your foreign relation? You're done! (3)
modified 28-Jan-19 14:24pm.
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No, cajun actually - but thanks for asking 
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Damn!
I wanted to pirate it, given that copying is not theft[^], but it would be a waste of effort, now!
I wanna be a eunuchs developer! Pass me a bread knife!
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Her entire collection(Films, Shorts, Movie images, Comics & etc.,) is in PD.
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