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/sci/ - Science & Math

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7459932 No.7459932 [Reply] [Original]

Is faster than light travel really never going to happen?

>> No.7459935

not 4 u

No really, we're not going to send any spergs up.

>> No.7459936

>>7459932

No. Nothing can ever go faster than light.

>> No.7459939
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7459939

>>7459935
Why such rood?

>> No.7459941
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7459941

>>7459932
No it isnt, have you even read anything?

People arent just over exaggerating when they say NOTHING can move through space faster than light.

>> No.7459950

Not in the classical sense, only hope, even in theory, is some warping/cuttting/burrowing of spacetime...or for something to show we have it all wrong...

>> No.7460561

>>7459950
This.

I'm still betting on the latter. There's more we just don't better understand, and only think we do. Some factor that we can't detect yet.

>> No.7460575

>>7459932
going faster than light violates the law of conservation of energy, at least for charged particles

>> No.7460696
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7460696

>>7459932
Fuck man who knows but I think humanity will probably figure some shit out sooner or later, we'll all be dead by then though so it doesn't matter

>> No.7460705

>>7460696
we've had powered flight for just over 100 years. i think it's far too early to declare that we have endgame knowledge of physics

>> No.7460710

How does light go so fast?
Cuz it has so little mass? But huge amounts of energy?

>> No.7460718

>>7459932
>Is faster than light travel really never going to happen?

I really wouldn't count on it. It hasn't actually been ruled out at all in terms of special relativity, but we still don't have any clue how such a thing could happen. And since we know relativity is an incomplete theory, any remaining holes that would allow for FTL violations could very well be plugged by quantum gravity.

Certainly all identified solutions that could allow for FTL travel would require such incredible energy densities that - even if exotic stress-energy conditions weren't involved - they would be beyond our reach as a civilization. And we have no idea how to induce exotic energy condition on those scales.

Still, there's plenty of exploration and exploitation to be done within our own solar system, and your children or grandchildren might even be the first to see pictures of an exoplanet from a slower-than-light interstellar probe.

>> No.7460720

We can circumvent the limit by manipulating spacetime, because there's no known limit to how quickly space itself can expand or contract. Matter cannot move at or beyond the speed of light.

There's a lab at the JSC working on developing warp fields, but we're still a ways off from actually using them, the technology is barely in its infancy.

>> No.7460722

>>7460710

Light is transmitted instantaneously, by its perspective. Time doesn't pass for a photon.

From our perspective, photons travel at the highest possible speed.

>> No.7460724
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7460724

>>7459932
Good news!

You can feel like you're traveling faster than light.

If you calculate your acceleration to 7c, and provide enough fuel to slow yourself again at your destination, the time required will match the time you experience on your journey.

Relativity only fucks with the perceptions of everybody else.

>> No.7460725

>>7460722
Yea But why? I thought We had rules about this shit

>> No.7460727

>>7460725
The universe does. Light's speed arises directly from those rules in a very simple and elegant way which I can't explain right now because it's midnight and I have to drive 544 miles tomorrow.

>> No.7460729

>>7460722
How do photons not experience time yet pass through space and `take´ for lack of a better word time

>> No.7460730

>>7460725

We do, I just told them to you.

Photons don't have mass, and experience zero time. Everything else has mass, and experiences time, and therefore perceives light to travel at the highest possible speed.

>> No.7460731

>>7460729

Time is relative. It only takes time for a photon to pass through space from our perspective.

>> No.7460733

>>7460730
Tbf you didn't really lay out any laws just consequences. But your further answers helped. I'm going to do a lot of reading

>> No.7460736

>>7460729
As you go closer and closer to lightspeed, your perception of time distorts relative to other observers. The faster you go, the less time passes for you.

At lightspeed, infinite time passes for other observers in zero time for you.

The reason for this is essentially that space and time are just two axes in space-time and they're relative to you; your coordinate system does not have to apply to anybody else's space-time. As you approach lightspeed, your time and space coordinate system distorts.

>> No.7460742

>>7460736
And there's actually a really elegant reason for this - special relativity is *simple*. You can derive this behavior directly from some very basic principles.

This isn't the best explanation, but here's a fairly simple geometric treatment with lots of diagrams: http://gregegan.customer.netspace.net.au/FOUNDATIONS/01/found01.html

>> No.7460747

>>7459936
Except the expansion of space itself

>> No.7460750

>>7460742
Hell yea. I dunno where i got confused but this is more like what I'm talking about. I was just forgetting some shit before.

>> No.7460751

>>7460733
>Tbf you didn't really lay out any laws just consequences

The laws are:

1. There is no preferred inertial reference frame. In other words, if you're in a closed and sealed laboratory with no windows, there should be no way to tell whether you're moving at a constant speed or standing still; the laws of physics are exactly the same for you no matter how fast you're going or in what direction.

2. It is impossible to exceed the speed of light. Einstein suspected this because of Maxwell's Laws of Electrodynamics, where the speed of light was directly derivable from the properties of space itself. If these depended on how fast you were going, #1 would be false, because you could measure light's speed in a vacuum and see if you were moving "relative to space." So the light in a vacuum must *always* appear to be moving at the speed of light relative to you.

>> No.7460787

>>7460751
All i was really looking for was that since light travels at c in a vacuum it doesn't experience time. I should have gotten it earlier

>> No.7460946

>>7459932
The good thing about GR is, that we don't need FTL travel for anything. You can get anywhere in any amount of time you'd like without ever being faster than light.