Is there a superluminal speed in the universe, and is there a speed of light in the universe?

The theory of relativity does not allow matter with mass to move faster than the speed of light, and if the speed of light is reached, the mass will be added to infinity, so the theory of relativity does not allow matter carrying mass and information to exceed the speed of light. In fact, faster-than-light is not impossible, as long as it does not carry mass and information, faster-than-light is allowed. The expansion of the universe, the wave function of quantum mechanics, and the tachyon do not violate the special theory of relativity.

Theoretically non-existent.

In order to accelerate the object, energy must be provided, but if you look at it unilaterally, a flower may be able to provide energy to reach the speed of light.

But in fact, when the velocity of the object increases, the mass also increases, and the energy required at this time is greater, and when the object is close to the speed of light, the mass is already very large, and it is difficult to increase its speed.

At present, only massless electromagnetic waves can reach the speed of light, so there is no superluminal speed in theory at present, and it may be found later, but not necessarily in the narrow sense.

There is a negative cosmic velocity in the universe that exceeds the speed of light, and it is the speed at which antimatter operates.

Negative cosmic velocity is the speed of antimatter, for example, if a person working at the South Pole station, if he misses his hometown, his thinking consciousness will reach his hometown in an instant, and if a person is in Antarctica, but his thinking consciousness is in his hometown, this speed is negative cosmic speed. For the sake of understanding, I'll assume that the negative cosmic velocity is: one light-year is one second (the actual velocity is faster than that).

When we enter the space tunnel, the speed we "walk" is the negative cosmic velocity.

I don't know, it doesn't exist in the existing theory.

It should not exist, because until now, no other speed limits have been found, and the speed of light years is already the fastest.

Yes, the other is called GZK truncation, the universe is very big, and there are many things that we humans can't understand.

It exists because the scale of the universe is very large, and there are many secrets and mysteries in it, so there are many unsolved mysteries that we need to understand.

According to Einstein's theory of relativity, the speed of light in a vacuum is the maximum speed of motion of an object in nature that has been discovered so far.

The speed of light is independent of the speed of the observer relative to the light source, i.e., the speed of light measured in the inertial frame relative to the stationary and moving light source is the same.

The mass of the object will increase with the increase in velocity, and when the speed of the object is close to the speed of light, its mass will tend to infinity, so it is impossible for an object with mass to reach the speed of light.

Only photons with zero rest mass are always moving at the speed of light. The speed of light is superimposed on any speed, and the result is still the speed of light.

The synthesis of velocity does not follow the laws of classical mechanics, but follows the relativistic laws of velocity synthesis.

The definition value of the speed of light in vacuum: c0=299792458m s.

But some scientists believe that there are three things in the universe that could be faster than the speed of light.

The first: light pulses.

A pulse of light is a light source that emits light intermittently at certain intervals, and in a vacuum, the light pulses measured at different locations seem to propagate at an incredible speed.

The second: quantum entanglement.

Gerald Cliffor, a professor of physics at Baylor University, believes that in the phenomenon of "quantum entanglement", information appears to travel faster than the speed of light.

The third type: the rate of expansion of the universe.

Two points in the universe that are far enough away to expand and regress "at a speed of light" that exceeds the speed of light does not violate the theory of relativity. At the same time, it also means that if two points are far enough apart, light cannot travel from one point to another, because the distance traveled by light in a finite time is always less than the distance increased by expansion.

Fourth: wormhole crossing.

A "wormhole" is a thin tube of space-time that connects distant regions of the universe. Dark matter keeps the wormhole's exit open. Wormholes can connect parallel universes to baby universes and offer the possibility of time travel.

A wormhole may also be a space-time tunnel connecting a black hole and a white hole, so it is also called"Gray Channel"。

Of course, there is a phenomenon in the universe that exceeds the speed of light, for example, the expansion of the universe is a phenomenon of faster than the speed of light.

Yes, and it has been confirmed by scientists. This substance is called "tachyon", and the lowest speed of motion is the speed of light, because modern science and technology are not developed enough, this substance has not been actually captured for the time being.

I think there should be, because the universe is so big, and our human understanding of the universe is still very small, and just because we haven't discovered it doesn't mean it doesn't exist.