Does light accelerate or decelerate in a gravitational field? Isn t the speed of light constant?

Doesn't slow down. But the energy carried by the photon decreases (minus the gravitational potential energy), i.e. the mass of the photon in the non-resting state decreases when it leaves the gravitational field, e=mc 2 (c is a constant, the velocity of the moving photon is constant). Or that the photon frequency will drop, e=hv (h is Planck's constant, v is the frequency).

As far as my amateur knowledge knows, no. Because the speed of light does not change, there is a difference in the speed of time between the near surface and the high altitude.

Yes, the light will be bent by the gravitational pull of the black hole, proving that only the gravitational pull of the Earth is too small.

For the time being, no matter what the upper limit of acceleration that humans can bear, it is based on the normal state, so the acceleration of the flying earth will always remain at the acceleration of gravity.

That is, motion at a uniform speed with twice the acceleration of gravity. (This acceleration is determined by the spacecraft.)

Measured and maintained internally, regardless of the pattern of energy) This is an old saying about whether the speed of light can be reached.

The theory of relativity limits the speed of an object of rest to the speed of light, so that the speed of a person flying away from the Earth can only be constantly approaching the speed of light, and we believe that he can reach the speed of light is derived from the Earth's frame of reference). In fact, the analysis of this uniformly accelerated motion still uses the special theory of relativity.

Because the scene we set takes place in the Min plane. If we put another condition to this question:"This person will eventually return to Earth in the same way as Obimin"。

Then the question becomes a twin paradox, but because the answer has already been given, the word paradox can be removed. (However, the most intuitive and clear explanation for the twin paradox is the use of space-time diagrams.)

According to Newton's gravitational force.

and the theorem of motion, we can calculate time and distance. Can an object fly towards a massive celestial body at this distance faster than the speed of light? Relativity.

No, when the speed of light is reached, time stops, the length of the object in the direction of velocity becomes 0, the mass disappears, the acceleration does not exist, it will maintain the speed of light and continue to fly.

So, what can we observe? This is relatively confusing. If it's curvature flight mode.

will not be affected by acceleration, because gravity at the curvature of the speed of light is affected by the expansion of the time dimension. The longer the time, the less gravitational pull there is until it disappears. It can be suspended by a small point force or fly in a certain direction at a very high speed, and according to the theory of relativity, it is impossible for a person to accelerate to the speed of light liters.

A well-trained astronaut can withstand more acceleration. Let's assume an acceleration of 80 meters and seconds and it takes about 10 hours to accelerate to 1% of the speed of light. In fact, no device can maintain such an acceleration.

Personally, I don't think it's feasible to gradually accelerate a moving object to the speed of light with our current means. In order to achieve faster-than-light motion, moving objects must enter the cavity and chain into another dimension that we have not yet understood, in this dimension, all objects can easily achieve faster-than-light motion, and all means of detection, information transmission and processing, motion control, etc. will be completely new. At the same time, faster-than-light objects do not collide with other objects in that dimension or with any objects in our three-dimensional world, and the objects in our current dimension have no effect or non-existence compared to the faster-than-light dimension.

As for the time it takes for humans to accelerate to the speed of light in conventional motion, if we do not consider the effects of relativistic effects when the speed is increasing, the theoretical time to accelerate to the speed of light is about 416 hours based on the extreme acceleration that the human body can withstand for a long time, calculated at 20 g. In our dimension, with the current propulsion technology, this is obviously unachievable.

It takes about a year, through classical mechanics can prove such a situation, about a year, it is possible to make people feel comfortable, but also to make people have an ideal state, can avoid fatigue, in such a bearing situation, the acceleration can reach about 5G slippery He Qi. Puna.

At least one year of inter-chamber inter-chamber is required. The basis is that someone calculated through Einstein's equation and came to the conclusion that it is almost impossible to reach the speed of light, and it will take a long time.

1. On the question of black holes and the speed of light. The speed of gravitational transfer and the speed of light do not affect the gravitational attraction of a black hole to light, just as the propagation speed of an electric field is the speed of light, but the electrons in the conductor move at a speed of only millimeters per second. If the mass is a well in space-time, the speed of the gravitational wave is the speed at which a little "vibration" on the space-time plane is transmitted to the distance, and the factor that determines whether the matter can escape from this well is the speed of the matter, just like rushing outward from a pit; Black holes are like infinitely deep traps that cannot be rushed out even at the speed of light.

Therefore, the relationship between the gravitational transport speed and the speed of light cannot be deduced from the phenomenon of black holes attracting light.

2. The change in this space-time distortion is the speed of gravitational waves, and according to theories such as quantum field theory, we guess that if gravitational waves exist, their transmission speed should be the speed of light.

3. I haven't considered the question of "the expansion rate of the universe in the early days of the universe far exceeded the speed of light". However, I speculate that the speed of light, as the speed limit of our space-time, should be related to a certain nature of space-time and matter. If the big ** theory is true, maybe space-time was a little different from what we have now in the early days of the universe (maybe there would be something like space-time equivalents or constants), resulting in a larger upper limit of velocity at that time.

It is also unknown whether the expansion rate of the universe is a concept of speed as we understand it, for example, two objects separated at the speed of light relative to a stationary frame of reference, and although their relative velocity is still the speed of light, the relative distance between them appears to be expanding at twice the speed of light in the stationary frame of reference.

I can't tell you all about what I know.

The gravitational propagation speed should be exactly equal to the speed of light. Microscopically, the light bending effect is the structure of the coupling of the gravitational field with the electromagnetic field (although no one knows how this is coupled). Physically, the coupling between fields corresponding to masses of 0 is not excluded.

For example, the gluon field can be directly coupled to the gluon field. Electromagnetic fields can be coupled with electromagnetic fields in a circle plot effect. So I don't quite understand your inference that the graviton velocity must be greater than the speed of light from the black hole that the photon cannot escape the graviton.

As for whether space-time warp takes time, the answer is yes. The speed of propagation is equal to the speed of light.

Finally, on the question of the rate of expansion of the early universe, it is important to realize that the part of the universe that moves faster than the speed of light relative to us does not really have any information related to us. Even now, there is still a faster-than-light part of the universe (at least not to rule it out), but the visible universe is only about 13 billion light-years. The closer you get to the edge of the visible universe, the regression rate approaches the speed of light, and the redshift approaches infinity.

At any point in the universe (including the unobservable), the visible universe is always finite, and the phenomenon of faster-than-light motion is not observed in the observed measurable universe at this point. It's like if you stand at any point on the earth, you can always see the circle in the horizon, and the tangent line between the circle and the line connecting you along the surface of the earth is relative to the slope of the plane where you are, which is not too big, but where you can't see it, the slope can be very large.

Does gravity change the speed of light? What a question! But in my use of Gordon.

Before I ask this question about the theory of everything, I would like to ask a few more questions.

Physicists know about the gravitational field.

How did it come about? We know what produces the gravitational field (mass), but we don't know the mechanism by which the gravitational field is generated.

Why does gravitational field affect light? It is hypothesized that mass bends space-time, creating a gravitational field, but physicists are not yet aware of this mechanism.

It is well known that the gravitational field affects the passage of time, but its mechanism is still unknown, and it is only understood that it is the correct observation and the mathematical way to interpret this observation.

What I'm trying to figure out is ......There are many missing pieces in this puzzle. The missing piece is in Gordon's theory of everything.

There is nothing missing in so keep this in mind and I'll have your questions.

Gordon's theory of everything reveals that all energy in the universe exists in three Gordonian states. Physicists know only two of these energy states, the energy of mass (proportional to C2) and the energy of light (proportional to C1). The fundamental energy state is the energy associated with the structure of space-time itself, which is proportional to c 0.

Light is moving energy at a speed of c 1 and the energy passing through space-time is proportional to c 0. Gordon's theory of all things defines the speed of light as the speed at which energy must move through energy to maintain Gordon's energy state.

Let's start by imagining that our universe has no matter, only light and space-time (the two Gordon states). The e0 energy along the path determines the speed at which the light energy travels through the path. Light is in a unit of quantum time.

A certain amount of energy is moved within. Thus, the e0 energy determines the "relative" quantum distance. Quantum distance is the distance traveled by light in one quantum unit of time. (Note that the ratio of quantum distance to quantum time units must always be equal to 1.) )

Since quantum distances are relative, so is the speed of light....But measuring the speed of light in any space-time, regardless of the E0 energy concentration along the path, it is always measured as c 0. Physicists don't know the e0 energy of space-time because it is inaccessible, but it is this energy that determines the existence of the speed of light.

Now that we have determined the speed at which light passes through energy, let's add the e2 energy of the mass. Physicists don't know this either, but all energy fields are generated by the interaction of e1 and e2 energies with potential space-time e0 energies. Particles containing mass extend the E2 energy field indefinitely.

The gravitational field is the coexistence of E2 energy with space-time.

Now, you have the answer ...... your questionLight slows down in the gravitational field because there is more energy in its path. The energy along the path can be any energy of any Gordon energy state. The bending of light (and what determines "straightness") depends on the presence or absence of an energy gradient, i.e., the photon has less energy on one side of the path than on the other.

Gravitational attraction can change the speed of light, and the black hole has enough gravitational pull to gather the light, and the light attracted by the black hole changes the speed.

Gravity can change the speed of light. Gravitational fields can distort space-time. When space and space are distorted, the speed of light must change.

The speed of light is constant, and you can stop it from moving forward, but you can't affect its propagation speed, which is consistent with any environmental velocity.

According to the general theory of relativity, space-time distortions create a gravitational effect, and the event of a change in the mass of an object causes a wave in space to propagate outward, and the speed of this wave is the speed of light.

The propagation speed of a relatively weak gravitational field can be rigorously proved to be the same as the speed of light in Einstein's general theory of relativity. Because there is an equation for weak gravitational waves, and the equation can be solved analytically.

Of course, that's just math. Physically, why is it the same as light, you can compare electromagnetic waves (light waves) and gravitational waves. The charge is the source of the light waves, and the mass is the source of the gravitational field; The electric field strength of the charge is inversely proportional to the square of the distance, and the gravitational force below the weak field can also be approximately inversely proportional to the square of the distance (Newton's law of universal gravitation); Electromagnetic interconversion, gravitational polarization can also have a similar "magnetic" component; Wait a minute.

Weak gravitational forces are similar to electromagnetic waves, so it is not uncommon for weak gravitational waves to travel as fast as light waves.

Regarding the observation of gravitational propagation speed, Wikipedia has a more detailed description. In addition, there is a ** article to argue that those who claim that gravitational waves travel much faster than the speed of light are not true.

In fact, in the case of strong fields, gravitational waves are generally not defined. Because the dynamic tensor in the field equation includes all the energy and momentum of the whole system, in general, it is impossible to separate the expression of good local energy. If you can't give energy, you can't explain the wave equation, and in general, you can't define gravitational waves.

In this way, the problem of gravitational propagation cannot be understood. This becomes a very cutting-edge question with no answers.

One of the methods mentioned in Liang's book can prove that for the most general vacuum Einstein equations, a plane wave solution can be obtained, and in many ways, this solution is a gravitational wave, and what is even more amazing is that the speed of propagation of gravitational waves represented by this solution is the speed of light. From this, it can be seen that Albert Einstein.

The equation does have such a concise solution to a plane gravitational wave, and the speed of propagation of a gravitational wave is the speed of light is rigorously proven.