To clarify your position, I keep asking you to tell me the elapsed proper time along a spacelike interval – any spacelike interval – and you keep not answering. Both bradyons and tachyons gain energy as they approach light speed. I’ve no idea, and perhaps nobody yet has, but I suspect not. By the theory of relativity there is the concept of proper speed; the speed of observer in respect of the supposed isotropic environment. This speed can limit arbitarily near to infinity and light speed in these kind of frame can be said to be infinite.
- However, various results illustrate that entanglement is not about some signal propagation faster than light.
- Also, you can circumvent the problem with the negative energies if you travel faster than light by using wormholes because in this case you can use entirely normal particles.
- That requires light-wave frequency changes, but you do not explain what would cause that.
- The cumulative effect meant the predicted times could be in error by more than 10 minutes.
The expansion rate, if we were to actually measure that over time, is still decreasing, and will eventually asymptote to a finite, positive, and non-zero value; that’s what it means to live in a dark energy-dominated Universe. The light from distant objects does indeed get redshifted, but not because anything is receding faster than light, nor because anything is expanding faster than light. Space simply expands; it’s us who shoehorns in a “speed” because that’s what we’re familiar with. Cherenkov radiation from the faster-than-light-in-water particles emitted. As these particle travel faster than light does in this medium, they emit radiation to shed energy and momentum, which they’ll continue to do until they drop below the speed of light.
Can Anything Travel Faster Than The Speed Of Light?
The nearest star to us, other than the Sun, is 4.35 light years away. So, travelling at the speed of light, it would take more than four years to get there. https://top10ten.co.uk/south-west-england/north-devon-and-exmoor/862-10-doone-valley-horse-and-pony-trekking.html Since you and I have mass, don’t expect to be travelling at twice the speed of light anytime soon. Indeed, it’s plausible the Universe only contains a finite amount of energy. That would mean there isn’t enough energy in the Universe to accelerate something with mass up to the speed of light.
The point with the Higgs mechanism is that it depends on the Higgs field, whereas astronomy tells us that this Higgs field does not exist. This is one of the problems of present physics which seem to be accepted by the community. Anyway, also this assumed mechanism has to reflect relativity, and it should do it quantitatively. All one needs is enough negative energy to build an Alcubierre drive or a similar setup. Probably that is an old question with an old answer, but it is new to me. My guess is that universe would look much the same, but would again have a much higher entropy than it started with at BB2.
Is It Possible To Travel Faster Than The Speed Of Light?
Einstein extended the theory well beyond Galileo’s, and one crucial upshot was that the speed of light is the same for all inertial observers, regardless of where they are or how they’re moving. The rate of expansion is dependent on the total amount of “stuff” in a given volume of space, so as the Universe expands, it dilutes and the expansion rate drops. Because matter and radiation are made up of a fixed number of particles, as the Universe expands and the volume increases, the density of matter and radiation both drop. The density of radiation drops a little faster than the density of matter, because radiation’s energy is defined by its wavelength, and as the Universe expands, that wavelength stretches as well, causing it to lose energy. Wikimedia Commons user Spigget However, particles suffer a different fate. If a high-energy particle that was originally passing through a vacuum suddenly finds itself traveling through a medium, its behavior will be different than that of light.
Eventually The Expansion Of The Universe Will Outpace The Speed Of Light
Give them an impossible dream, and they’ll give you an incredible, hypothetical way of making it a reality.
A ball you are holding will seem still to you, even when you’re in a moving car. But that ball will seem to be moving to anyone standing on the pavement. The notion of the absolute speed limit comes from special relativity, but who ever said that special relativity should apply to things on the other side of the universe? The result is that the first time the slower ship can see the faster one is when they’re right on top of each other. From the perspective of the slower ship, the warp ship will simply appear out of nowhere. Then, the light from two directions will reach the slower ship all at once, and it will perceive two versions of the ship moving away in both directions.
For an earthbound observer objects in the sky complete one revolution around the earth in 1 day. Alpha Centauri which is the nearest star outside the Solar system is about 4 light years away. On a geostationary view Alpha Centauri has a speed many times greater than “c” as the rim speed of an object moving in a circle is a product of the radius and angular speed. It is also possible on a geostatic view for objects such as comets to vary their speed from subluminal to superluminal and vice versa simply because the distance from the earth varies. Circumference of a circle radius 1000 AU is greater than one light day. In other words, a comet at such a distance is superluminal in a geostatic frame.
But it’s not just light that has a constant speed, change has a constant speed. It’s how fast you can ever know that something actually happened. When two black holes collide, they create gravitational waves that also travel at this speed of causality. When LIGO first observed an event like this, it actually happened 1.3 billion years ago but it since it’s far away, it takes time for the signal to reach us.