Faster than light travel is the dream and nightmare. The thing is that there is an introduction that faster-than-light travel is not possible. But it's possible to create conditions where photons, wave motion, and all particles can travel at the same speed.
But when we are looking at things like neutrino we must realize that different quantum systems affect different particles in different ways. The same quantum system that slows the photon doesn't slow neutrino. The speed of light depends on the quantum system. And the water slows photons very much.
Water slows photons and all other particles because energy travels out from photons faster than in a vacuum. When the particle is slowing it must transfer energy to the quantum system around it. The thick quantum systems transmit energy out from particles faster than thin quantum systems.
Image 2)
Hypothetical travel times to Proxima Centauri. The nearest known star to the Sun. (E. Lentz) (ScienceAlert.com/Faster-Than-Light Travel Could Work Within Einstein's Physics, Astrophysicist Shows)
So slowing the speed means that kinetic energy turns to heat. And the reason why there is a limit on the speed is that when the speed of the object increases it will hit particles and quantum fields more often than at a slow speed. Whenever an object hits another particle or quantum field, energy moves away from the moving object. Energy always travels away from higher energy levels to lower energy levels.
Every object attempts to reach the same energy level as its environment. When an object reaches an energy level that is the same as its environment. It will not accelerate anymore. The reason for that is the energy stability. Increasing the speed requires that there is some kind of energy that impacts the craft or object. That energy must raise the energy level of that object higher than its environment.
There are made some kind theoretical tests. The hypothetical spacecraft will travel at a speed that is about 99% of the speed of light. And then, the craft will impact with incoming photon or electron ray.
The simplest way to make that thing is to drive the craft to Proxima Centauri and impact with a plasma ball that surrounds that star with the speed of light. The incoming plasma particles will increase the energy of that craft when the craft hits them.
That thing allows raising the energy level of that object to the level where crossing the speed of light is possible. When the object reaches the speed of light there must be something. That increases its energy level, to the level that it can continue its acceleration.
One version of the thing that makes an object travel faster than photons is simply. Remove all quantum fields and particles away from the route of the object. Another way is to increase incoming objects' energy level to a level that is higher than the traveling object's energy level.
If an object like spacecraft impacts particles. That are at higher energy levels than that traveling object. Energy will transfer to that object. The reason, why crossing the speed of light is so difficult is that at the speed of light energy travels out from the spacecraft. But we know that crossing the speed of light is very difficult. There is lots of research to make before anything can be sure.
https://www.foxnews.com/science/100-year-starship-symposium-kicks-off-to-ponder-interstellar-travel
https://www.reference.com/science/speed-light-water-cc36399c646cfe33
https://www.sciencealert.com/faster-than-light-travel-could-work-within-einstein-s-physics-astrophysicist-shows
https://www.sciencealert.com/why-is-the-speed-of-light-the-speed-of-light
Image 1) https://www.foxnews.com/science/100-year-starship-symposium-kicks-off-to-ponder-interstellar-travel
Image 2)https://www.sciencealert.com/faster-than-light-travel-could-work-within-einstein-s-physics-astrophysicist-shows
https://miraclesofthequantumworld.blogspot.com/
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