/sci/ me and my friend are in an argument right now. Does it

>>8595273
no. light travels at the speed of light

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>>8595275
no but I mean for anything else to travel at the speed of light?

>>8595277
Nothing with mass can travel the speed of light. No inertial frame of refrenchanting for it exists

>>8595273
Bro, just look it up.

>>8595277
Gravity waves travel at the speed of light. So why not say that light travels at the speed of gravity? Gravity speed is only called light speed for the sake of history. Something to ponder.

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>>8595273
>Does it go against the laws of physics for something to go the speed of light?

I think it depends how you define go. Information can be conveyed at a rate faster than then speed of light (instantaneously) on a quantum level, and particles can disappear and reappear on the other side of the universe. Neither of the two occurrences violate the laws of physics. The problem is that one can easy argue that these particles are not being moved at all, as no direct force is being applied to them (at least none that we know of).

>>8595277
Massless particles can. Like gluons or hypothetically gravitons.

>>8595311
Information cannot be transmitted faster than c through entanglement

>>8595330
>Information cannot be transmitted faster than c through entanglement

Do you have a valid source/link to support this statement? From what I've been reading, I presumed that this has not been proven to be the case; rather evidence is supportive of the opposite.

I'd be very interested to learn about any new developments, if what you say is indeed the case--the book I've been reading isn't brand-new, so I don't want to put all my eggs in one basket yet.

>>8595353
https://en.m.wikipedia.org/wiki/Superluminal_communication

See quantum non locality.

The gist is that no information can be derived that wasn't aleady able to be inferenced.

There's lots of other explanations about it online.

>>8595363
So, you'd have to broadcast your radio signals through Einstein-Rosen bridges. ;)

>>8595377
Still thats sub liminal

>>8595353
>From what I've been reading, I presumed that this has not been proven to be the case; rather evidence is supportive of the opposite.
It depends on what you consider "information". If you consider that the fact that one particle instantaneously assumes the opposite state to imply some kind of shared information between the particles, then yes, there's information transfer, but that's not what people are talking about when they talk about entanglement in this context.

The problem with that statement is that the probability of a particle assuming one quantum state versus the other is not pre-determined. You can entangle particles, measure the property in one, and then infer that the other assumed the opposite quantum state instantaneously, but there is no way to relay the information about what quantum state you observed to the other person at any rate faster than light.

If I have one half of an entangled pair of particles and I measure that it's spin positive, I can know that the other particle MUST have been spin negative even if the other particle was a thousand light years away. However, there's no way for me to transfer that knowledge to whoever has the other half of the pair besides normal light-speed communications. It could just as easily have been the other way around, and the next time I run the experiment, the probability resets.

>>8595404
Solid post. Thanks for the clarification!

>>8595330
Can't you use entanglement to figure out the message though, as in though the information hasn't traveled faster than c, you can figure out what the information is because of entanglement.

>>8595273
So do all the good little photons all go the same speed (c), cause that would be incredible? Wouldn't gravity slow it down or caught by a black hole speed it up?

>>8595548
When photons encounter gravitational fields, they change frequency instead of speeding up or slowing down.