5/19/2023 0 Comments Ftl faster than light rule 34You are going back in time, yet you are getting older. Now the reason for the grandfather paradox is not faster than light travel, but it’s that these stories screw up the direction of the arrow of time. One direction is forward, the other one is not. In any case, you probably don’t need convincing that we do have an arrow of time and that arrow of time points towards more wrinkles. It’s very easy to get it mixed up and very difficult to unmix, though that is in principle possible. If you have many particles together, you can still in principle reverse any particular process in time, but the reversed process will usually be extremely unlikely. It arises from the behavior of large numbers of particles together. *Our observation that forward in time is different than backward in time comes from entropy increase. A particle does not know which direction of time is forward. These two descriptions are mathematically just entirely identical. Imagine you have a particle that goes right to left backwards in time, what would it look like? It would look like a particle going left to right forward in time. It’s not even hard to see what’s wrong with this argument. I will now explain why this is complete nonsense. At least that’s what most physicists will tell you or maybe have already told you. So, faster than light travel is a problem because it can lead to causal inconsistencies. The idea is, that you could go back in time, kill your own grandfather – accidentally, we hope – so that you would never be born and could not have travelled back in time to kill him, which does not make any sense whatsoever. Really, that’s what the mathematics says.Īnd that, so the argument goes, is a big problem because once you can travel back in time, you can create causal paradoxes, the so-called “grandfather paradoxes”. However, there is a problem with particles that go faster than light, which is that for some observers they look like they go backwards in time. So really Einstein did not rule out faster than light motion, he just said, no idea how to get there. You just don’t know how to accelerate anything to such a speed. However, there is nothing in Einstein’s theory that forbids a particle to move faster than light. And this is why you often hear that the speed of light is an upper limit. You cannot do that because it would take an infinite amount of energy. Next, Einstein also showed that if you have any particle which moves slower than the speed of light, then you cannot accelerate it to faster than the speed of light. But if it turned out one day that the particles of light have a small, nonzero mass, then we would still have this invariant speed in Einstein’s theory, it just would not be the speed of light any more. And since the particles of light are, for all we currently know, massless, we usually identify this invariant speed with the speed of light. One can show that this is the speed of massless particles. ![]() Einstein’s theory of Special Relativity contains a speed that all observers will measure to be the same. To find out let us first have a look at what Einstein really said. Like, is there anything actually preventing us from ever developing a technology for faster than light travel? Instead, I want to talk about whether it is possible in principle. But you already knew that and it’s not what I want to talk about. To get the obvious out of the way, no one currently knows how to travel faster than light, so in this sense it’s not possible. This means if you want to continue seeing my music videos, please go and subscribe to my other channel. They’re like oh my god she sings, what’s that? So, to make it easier for you, I will no longer post my music videos here, but I have set up a separate channel for those. And I have noticed that the newcomers are really confused each time I upload a music video. My channel has seen a lot of new subscribers in the past year. But is this really correct? This is what we will talk about today.īut first, a quick YouTube announcement. You have probably heard something like that. ![]() Einstein said that nothing can travel faster than the speed of light.
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