Event view

honggarae 12/08/2022 468

Introduction

Event Vision (English: Event Horizon) is a time and space of the magazine. Any events in the vision cannot have an impact on the observer outside the video. It is an event vision around the black hole. Under the influence of very huge gravity, the escape speed near the black hole is greater than the speed of light, making any light escape from the internal visual interface. According to the broad relativity, in the eyes of the external observer away from the horizon, any object from the exterior of the vision will need to reach the vision interface with an infinite period, which has undergone red shifts that have endlessly increasingly enhanced; but the object itself Will not feel any abnormalities and will pass through the perspective within a limited time.

Ahmed Almheiri, Donald Marolf, Joseph Polchinski, James Sully In recent years, the incident will cause the black hole fire wall, and the existence of the firewall is contradictory with the black hole itself.

Other related but different visits include the absolute vision lines and views that can also be found next to Black Hole. Some of the relevant nouns include Kexi and the base of the cosmic, cosmic somewhere in the cosmic, and the like.

Black hole event Vision

The most famous example of the episode of the extensive relativity is from the description of the black hole: a mass of material or radiation cannot escape the celestial body of its gravity field. . Typically, this boundary is when the disengagement speed of the black hole is greater than the position of the radius. However, more accurate descriptions are in this view, all of the light cone has been deformed toward the Heaven Center. Once the particle enters the perspective, running toward the black hole and is unavoidable as the time in time, and the two are even the same under certain coordinate systems.

The size of the SHW radius is the surface of the Events that do not rotate black holes (the behavior of the black hole of the rotation is slightly different). The Sishi radius of an object is proportional to its quality. In theory, any quality object can be compressed into a black hole, as long as we compress all the quality into the space corresponding to the Switch radius size. For example, the Sishi radius of the sun is approximately 3 kilometers, while the Sishi radius of the earth is approximately 9 mm. However, in fact, the earth and the sun do not have sufficiently large quality to resist electron with neutrical degenerate pressure generated in this high density. In fact, it is necessary to overcome such a pressure to form the quality required by the black hole, which is called the Auben Sea, about 3 times the solar quality.

However, the concept of the vision of the black hole is often misunderstood. People usually mistakenly believe that black holes will puminate the substance into vacuum, in fact the black hole is the same for the attractiveness of the substance and other gravity substances. Another conceptually misunderstanding is that people can observe the process of falling into the black hole, which is impossible. Astronomers can only see the potter near the black hole, because the high-energy radiation generated by the material high-speed movement here can be observed. In addition, distant observes are not possible to see the substance across the event vision, and only the substance is close to it.

Cosmic Science (Cosmo "

There are also different visits in cosmic learning. Among them, the essence of cosmology is the farthest point of the same shift distance in the observable universe, that is, the photon discharged from "now" will be able to be seen at the farthest distance by future observes. This is different from the perspective, particle vision, and the concept of particle profound in another cosmology. After a given time observer, the particle vision is still movable at the farthest distance from this observer. The photons emitted in the particle vision, even when the universe is born, the photons will not be able to reach this observer. The relationship between the position and time of the cosmic vision is based on the expansion of the universe. When the expansion of the universe has a specific nature, the partial universe will never be observed regardless of the observer.

To the transparent speed of the event vision is:

In this formula, "a" is a universe scale factor, "C "It is light speed,"

"is the focus of the time axis of the time and space, if the universe expands, this value is infinite.

However, there are also cosmic models that do not have an event vision, an example is a Dezt Cosmo model. A detailed record of the specific calculation of the cosmic sciences is recorded in the paper on the FLRW cosmology model, a model of the universe in the state equation.

Relative Vision of the Accelerated Particles

If a particle moves in an equal speed in the universe of the universe and does not receive the gravity field, then any incident occurred in the universe will eventually This particles are seen because the light cone in front of these events has intersessional games with the world of particles. On the other hand, if the particles are accelerating, in some cases the elements are not intended to have a glimpse of the world line of the particles. In this case, we said that a relative visitor appears in the (accelerated) reference coordinate system in the particle, representing a boundary that cannot be observed by the particles.

For example, a particle such as an equal acceleration movement will have a relatively visual interface. When a particle accelerates, he will get closer to the speed, but it is not possible to reach the speed of light relative to his own reference coordinate system. His trajectory is a double curve, and the asymptotic line of the double curve is a 45-degree straight line. If the edge of an event is in this progressive line, he cannot be observed by this particle. From the perspective of particles, there is a boundary that can escape without signals, called relative vision.

In the daily life, the departure will not appear, as this requires unlimited acceleration particles, which represents unlimited energy and unlimited equipment.

Interaction with the Event Vision

People often think that the event perspective, especially the black hole, is a non-variable interface that will be destroyed close to its substance. In fact, the concept of all events is for observes away from their observes, and the objects close to the incident will never feel that I have spanning the episode of the incident (that is, the light cone and observer of this event throughout the video. World line never intersects).

For a viewer such as acceleration movement in a wide space, regardless of how the surrounding material moves, the horizon seems to be outside a fixed distance. If it is changed to change the observer's acceleration, the position of the horizon may have changed. In addition, the observer will never touch the perspective of the perspective. If the observer is a inertial coordinate in the Destec universe, the location of the horizons will remain fixed.

When discussing is the vision of the black hole, the distant and relatively stationary observer at the bits will see an event vision at the same position. This seems to allow the observer to drop a rope to let him touch the event perspective, because the distance to the vision is limited, so only a limited long rope can be achieved. In fact, this is not possible, if it is slow to hang down the rope (that is, every point on the rope is relatively stationary in the Sishi coordinates), the closer to the acceleration (G power) of every point on the rope of the perspective. Close to infinity, the rope will be torn. If it is fast down the rope, then the bottom of the rope can indeed contact or even cross the horizon. But once this happens, the observer will not pull back the rope back, because the rope will definitely pull the rope, however, it is assumed that the rope is tightened, then the tension on the rope will increase with the distance from the perspective. And pull the rope at some point. Also, the cord breaks do not occur in the event view but in a place that can be seen by the observer.