As of the 21st century, according to current scientific theories, matter is required to travel at slower-than-light speed with respect to the locally distorted spacetime region. Apparent FTL is not excluded by general relativity; however, any apparent FTL physical plausibility is currently huitres-leucate.com/le-mas-bleu-leucate speculative. Examples of apparent FTL proposals are the Alcubierre drive, Krasnikov tubes, traversable wormholes, and quantum tunneling. As I mentioned earlier, when light goes from a vacuum into another material, it slows down. It is possible that a charged particle, such as an electron, can enter a material with sufficient force to move faster than light within that material. (The speed of light within a given material is called the phase velocity of light in that medium.) In this case, the charged particle emits a form of electromagnetic radiation that’s become called Cherenkov radiation.
- This is why a muon, an unstable particle with a mean lifetime of just two microseconds, can get created at the top of the atmosphere at speeds very close to the speed of light, and can reach all the way down to the Earth’s surface.
- If the initial state did not have low entropy you can’t explain why our universe evolved in the way that we observe.
- If possible, it would allow astronauts to travel between stars in weeks or months instead of tens of thousands of years.
- Einstein said it is impossible, but as Jennifer Ouellette explains some scientists are still trying to break the cosmic speed limit – even if it means bending the laws of physics.
- They have found insufficient conduction velocities to sustain this theory.
I guess it’s the direction in which entropy is increasing. But entropy is a property of an individual system, not of spacetime as a whole, no? So the direction is system dependent, not a universal feature of spacetime. As an explanation of the actual observation with respect to the cosmological constant there is a certain ‘dark energy’ assumed as we know. And if this question of a specific energy is investigated, what is wrong about the way to look at all energies which exist here? By weaving Boltzmann time into your analysis of time travel, I think you are at least indirectly making an argument for the existence of a canonical frame.
You have not yet made any points that argue in its favour to me.. In future if you want to dismantle mainstream theory and propose an alternate theory, please supply valid positive arguments citing contemporary observation and experiments and I will have more time to listen and comment.. The chart requires that there is such a thing as “tired light” after all, or something similar to it, although that idea was long ago discarded. You claim that as space expands, light waves are stretched out to create the redshift effect. That requires light-wave frequency changes, but you do not explain what would cause that.
If You Traveled Faster Than Light, Would You Travel Back In Time, And Would Gravity Repel You Instead Of Attract You?
Römer observed that the time between eclipses varied slightly depending on the time of year. At times when the Earth was moving away from Jupiter, the time between Io’s eclipses gradually increased; as it moved closer the time decreased. The cumulative effect meant the predicted times could be in error by more than 10 minutes. But not long after, in 1676, we got a fair estimate of light’s speed from a young Danish astronomer by the name of Ole Römer.
Science X Account
The evanescent waves in the Hartman effect are due to virtual particles and a non-propagating static field, as mentioned in the sections above for gravity and electromagnetism. There have been various reports in the popular press of experiments on faster-than-light transmission in optics — most often in the context of a kind of quantum tunnelling phenomenon. However, as stated above, a superluminal phase velocity cannot be used for faster-than-light transmission of information.
Does Light Experience Time?
Time dilation is “an actual difference of elapsed time between two events as measured by observers either moving relative to each other or differently situated from gravitational masses”. This is why astronauts returning from the International Space Station have ‘traveled’ 0.007 seconds into the future after spending 6 months in orbit. Of course, they haven’t really traveled forward in time; they just aged slower relative to everyone on Earth.
More From The Infinite Universe
On Aug. 15, 1930 in Santa Ana, CA, Dr. Albert A. Michelson stood alongside the mile-long vacuum tube which would be used in his last and most accurate measurement of the speed of light. Rømer’s calculation put the speed of light at about 124,000 miles per second (200,000 km/s). Aristotle, Empedocles, Galileo , Ole Rømer and countless other philosophers and physicists in history have contemplated the speed of light. Light travels from the moon to our eyes in about 1 second, which means the moon is about 1 light-second away.
Does The Expansion Of The Universe Break The Speed Of Light?
The observable universe, more technically known as the particle horizon. The concept of nuclear fusion within the sun is in big trouble. They have found insufficient conduction velocities to sustain this theory.
