Faster than light Definition and 244 Threads

Based on the current understanding of general relativity, it is possible that curving spacetime in the back of a spacecraft would allow for faster-than-light travel. In general relativity, the curvature of spacetime is determined by the universe's distribution of matter and energy. If a...

Dear Anyone. Please be nice and let me down gently, I know more about tapdancing than physics and I can't tapdance! It's just... Kept reading nothing could go faster than light, in a vacuum (space.) So I Googled 'why' and discovered it's because things get heavier and heavier as they get...

hello everyone I read this text in physics book: "Another example is the so-called Cerenkov radiation, which consists of light waves emitted by charged particles that move through a medium with a speed greater than the phase speed of light in that medium. The blue glow of the water that often...

According to professional scientific literature and to our best understanding, are there any suggestions that entanglement might imply some sort of faster than light signaling between the entangled particles? I know that according to relativity nothing can travel faster than light, but what...

Faster than light travel is most likely impossible (at least in this dimension) BUT hypothetically I was thinking back to Star Wars: The Force Awakens. At the near-end of the movie, Han Solo, Rey, Chewbacca, Finn and BB-8 get through Starkiller Base's shield by exploiting a loophole. The shield...

Homework Statement:: Einsteins Theorie Relevant Equations:: Theorie Hi. My name is Sven Dahlhaus. I'm from Germany and just got my high school diploma. Nevertheless, I am a big fan of theoretical physics. There is a question that bothers me a lot. According to Einstein's theory, nothing can...

Let us consider a hypothetical scenario, where we are able to translate any mass at a constant speed of 10m/s w.r.t to a given frame of reference. For simplicity, we are going to assume that the object is at rest initially. Case 1 - Now, consider 2 points A and B at a distance of 10m, and our...

I read that our telescopes pointing in any direction show light coming from the early days of the Big Bang (like 13.7 billion years ago). So did the expansion of the Big Bang to "fill" the universe happen faster than the speed of light?

Hi bear with me I have a conundrum I want to ask you. If data traveled many times the speed of light could the results of decrypted cypher message be computed quicker than any system we currently have? For instance if we sent a burst of data at many times the speed of light across the solar...

i made a simulation of waves in glass and in air. my simulation has led me to believe that if light begins in glass, it can travel to the air, and then move much faster, and then go back into the glass at a point further down. Could this happen in real life? here is the video of my...

as I read here http://www.bbc.com/earth/story/20160429-the-real-reasons-nothing-can-ever-go-faster-than-light#:~:text=But%20light%20is%20made%20up,when%20particles%20like%20electrons%20cannot%3F&text=The%20natural%20energy%20they%20possess,are%20already%20at%20top%20speed. things with mass...

I was wondering if it would be possible to see the history of space if one was to stand at the edge of the universe as it expanded faster than the speed of light. If the universe was to be expanding faster than the speed of light right now, and I was able to somehow go there and keep up with it...

Hi :) I just had a (most likely totaly unoriginal) thought and thought I should try to ask someone who's thinkings on physics are somewhat more refined than mine. So after thinking twice about private messaging Mr Tyson and Mr Cox :) I decided to google 'physics forum'. So here I am with my...

Hi, I always used to struggle with the concept of "space itself expanding" (didn't Einstein say that the aether did not exist?) until one day an idea struck me that seemed to explain it all, without any need for complicated math. After talking about it with others, I got some great feedback...

I've wondered what would happen to a particle if it could break through the 186,000 miles/second speed barrier and go faster than light. Would it go say 186,001 miles/second or would it go infinitely fast. I know Einsteins Special Relativity prohibits this but I have just wondered. Now if this...

Ok so I'm having trouble understanding how to calculate this If an object is moving so fast that it would take... "Hours for light to catch up to it" .. how fast would it have to be moving? Let's say it would take 2 hours for light to catch up to it. What kind of speed are we looking at...

Summary: Dark matter, the elusive mass that makes up most of the universe, doesn’t interact with light. Is this because it travels faster than light itself? I have been working on the maths and the theory for several months now in order to discover the nature of dark matter. By rearranging and...

So, I have this idea for the FTL engine for artistic purposes and I wanted to ask if anybody could point out it's flaws. I would greatly appreciate if you were willing to discuss them further. It is just a rough summary, so if you want me to disclose more details, ask away. The idea is as...

I keep hearing in these Science Channel programs that the reason why the Big Bang banged (instead of immediately collapsing into a black hole) is that when it banged it made space to expand faster than the speed of light. I'm always puzzled on how sure and certain the speakers look in these...

OK, going to ask a question that I sort of know is going to be shot down but at the moment I can't make sense of this. If I send a machine/robot with a particle that is quantum entangled with another particle that is left on earth. When one particle is blue the other is red. The machine also...

Okay, first of all so I'm in no way educated in the concepts and especially the notation of quantum physics; my knowledge is confined to a very simple superficial understanding. However, if someone could educate me about why faster than light communication is impossible in the scenario I'm...

I have seen thought problems with an observer on a train or in a station, etc., but I have not seen ones with the observer traveling at relativistic speeds. It seems to me that at sufficient speed he would observe himself exceeding the speed of light due to the slowing of time. This seems like...

This of course is speculative, but IF faster-than-light travel (or wormhole tunneling or some other exotic means) was found to be able to communicate information from the future to the present, what would that indicate about the structure of time? Some might argue that indicates a block-type of...

It’s written almost all physics books and courses that entangled photons can’t be used for faster than light communication. The question about used entangled photons to communicate faster than light has been discussed before, but I didn’t get exactly why faster than light communication with...

Hello. I have been thinking on faster than light things. I thought about: chemical engines, lasers, wormholes... All that kind of cool, advanced physics. But, I stumbled on faster than light mechanical actions. I thought about a lever: first class, if you wish, if you apply a force to one side...

If the concept of a wormhole is like folding a piece of space-time like a piece of paper, for near instantaneous travel faster than light, what is keeping us back right now? I am aware that it's really complicated and far beyond my scope of understanding right now, however I am fascinated by...

If Alice and Bob had a large number of particles entangled together (with state of either 0 or 1), could Alice send information by breaking the entanglement of particles with state of 1 (by flipping the state for example) so that Bob measures 50% of particles to be in the state opposite of 0...

Imagine yourself to be bat. You can't see anything. You don't have eyes. All you can do is echolocate, using ultrasound. Now imagine something is moving away from you faster than the speed of sound. Can you locate it ? Can you perceive its existence ? If the answer is yes, how ? If no , then...

We have two points A and B, separated by 10 light years away. WE have an iron tube conecting the two points, so this tube its 10 light years long. We are at point A and want to communicate with B, we have two options: -move slightly the iron tube---> instantly the observer at B will receive...

Imagine a small cylinder with a dot at the top. Rotating the cylinder 1 degree clockwise of 0 degrees could signify a 1; and 1 degree anticlockwise of 0 degrees a zero. 0 degrees would be a space. Someone rotating one end of the cylinder would cause the other end of the cylinder to rotate...

If general relativity in the formal sense constrains all velocities to the speed of light as a maximum, how would superluminal group velocities exceeding speeds of light (at their superpositions) be evaluated in mainstream physics? Would this be a case of General Relativity and Physics...

I just read this article and it sounds like they are claiming that there are electron currents moving 6 times the speed of light? Am I understanding this correctly. The article title is "Faster-Than-Light Pulsar Phenomena"http://www.universetoday.com/49646/faster-than-light-pulsar-phenomena/

This is something I often read in news on established websites, and countless times more in different forums. It goes something like this: someone says that in order for us to be able to do something, we would have to reach distant galaxies. To which someone replies "Yeah, but unfortunately...

https://www.sciencedaily.com/releases/2012/10/121028142217.htm Usable or not this seems to be a spooky statement can this 10000 be falsified?. Experiments have already shown that if you want to invoke signals to explain things, the signals would have to be traveling faster than light -- more...

I know there is a modern paradigm that states that nothing, including information, can travel faster than the speed of light. (With exception to quantum entanglement, but I'm not going to pretend like I know the exact details of that subject). Thought experiment. Imagine there are a series...

Hi everyone, Recently I randomly thought of a thought experiment of something going faster than light, along the lines of a shadow or some other "non-information carrying object". In this case it would be an empty seat. The idea is to take 800 million and one chairs of half a meter breadth...

Hi, I'm a CAD student, writing a research paper for my English Comp. class on interstellar travel. I wan't to quote Einstein but can't find were he stated this exactly: Because space and time are relative, the faster you move through space the slower you move through time relative to someone...

In my universe, the laws of physics are exactly the same, except we've figured out how to create an Alcubierre drive (we discovered how to create negative energy density, how is done through handwaving.) So, with that assumption, what would you actually see while traveling in a warp bubble like...

if i throw a ball of matter forward in space will it travel faster than light given enough time and space with nothing what so ever to stop it i.e Newtons first law of motion in effect.i figured it should becuase it will have a force to give it a constant acceleration(change in velocity).my...

From the observation point of Earth, you can say that the sky "moves" while the Earth is still. From this point, an observer on Earth would see a distant galaxy travel a circumference millions of light years lomg around the Earth in only a day - resulting in a velocity faster than light. Special...

Greetings everyone, I asked my professor about this, recently. I had always heard that if you could gain the impossible amount of energy necessary to run beyond the speed of light, you would travel backwards in time. But he however, told me something that I have never heard before. He said...

Hello, here is some reasoning how I got possibility to communicate faster than light. Likely somewhere are mistakes, but I can not find them by myself. Let's consider very simple setup with observers Alice, Bob and a source of entangled photons in-between of them like so...

Hi guys In an assignment I wrote for university I was penalised for claiming that FTL neutrinos would violate special relativity. Below is the relevant part of my assignment and the response from my lecturer. Could somebody please explain what he could mean by that because as far as I can...

So quantum entanglement acts faster than light but it's not technically communication and not actually transferring "information"? Can someone explain this to me?

If an object is in a large vacuum chamber and is dropped, what is to stop it from accelerating to the point that it passes the speed of light, because there would be no air resistance to stop it from constantly accelerating?

A couple of questions around faster than light travel. 1. I don't understand why this implies traveling back in time (as is sometimes suggested). For example : A tachyon traveling at 150% c travels between Point A and Point B and back again. While it will arrive at Point B before it is...

According to the theory of relativity the speed of light is the cosmic speed limit which means(I think) nothing can go faster than the speed of light.Then how universe can expand faster than light itself?

Let’s say I am on the earth’s surface and observing a galaxy at a distance of d=10 billion light years away. In the course of one day, I will have observed the galaxy to move 2*pi*d in my frame of reference. Of course, this is >> c. Now it will be argued that the Earth is rotating so I am not...

Quantum Communication. All systems described by quantum mechanics can display so-called entanglement, for example, the spin of one electron cannot be known in advance of a measurement yet will be perfectly correlated with the other, even if it is in a distant location. This has recently been...

Hello everyone, I was thinking of the 4 forces and in particular of the gravity force. We know that black holes and their gravity force can bend light and light gets lost on black holes. How can the ipothetic particle of the graviton interact with the photon? I thought that if the interaction...