In-depth long article: Is our universe just a holographic projection of the distant universe? What is reality?

What is reality?

Reality is an abstract concept that humans subjectively perceive, and it is the answer given under the human thinking model.

In layman’s terms, the world we see around us is reality. Such reality not only includes objectively existing objects, but also what happens every moment, the information and energy transmitted, etc. are all manifestations of reality.

However, as scientists conduct in-depth research on a strange celestial body, what we think is true has been greatly challenged.

This kind of celestial body is a black hole!

Everyone has heard of black holes, and in 2019, scientists took the first photo of a black hole (of course not taken directly with a camera), confirming that black holes do exist.

But black holes are different from ordinary celestial bodies. Black holes are the products of the death of massive black holes and are the tombs of massive stars. But black holes are essentially different from stars, mainly because the black hole is too massive, especially the singularity in the center, which is beyond our understanding.

Since the existence of black holes was predicted by the general theory of relativity, scientists have not stopped studying black holes. People want to know what would happen if they get close to or even fall into a black hole.

Suppose you and I go traveling near a black hole. You want to experience the feeling of falling into a black hole for yourself, while I watch the whole process of you falling into a black hole near the black hole's event horizon. You and I What will you see?

According to the interpretation of general relativity, the greater the gravity, the slower time passes. As you get closer to the black hole's event horizon, I can see that time is passing slower and slower for you. Everything is in slow motion for you, like a slow motion movie. It takes a long time for you to get closer. Black hole event horizon.

Eventually, the huge force of gravity will tear you apart completely, and you will turn into ashes on the surface of the event horizon. I'm sure you'll never come back, because nothing can escape the powerful attraction of a black hole, not even light.

But what will you see?

Strictly speaking, we don’t know, because no one has actually experienced the feeling of falling into a black hole, so we can only guess. Most likely you will cross the event horizon and eventually reach the singularity at the center of the black hole.

A black hole swallows you just like it swallows a star, but you are too insignificant compared to the star.

Since the two of us have a very good relationship, I began to regret letting you go on a journey with no return, so I tried every means to get you back to the real world and let you escape the black hole.

So can you escape the black hole and return to the real world?

Simply put: No. But even if you can't, that doesn't mean all is lost for you.

There are two views on this. The first view is that black holes only have angular momentum, mass, charge and other attributes, and all information about objects falling into the black hole is lost.

But there are also opinions that information cannot disappear no matter what, and it is impossible for people to destroy the information of an object.

Give a popular example. You accidentally burned a book and it turned to ashes. You might say: the message of this book is lost.

But has it really disappeared?

No. The information you are talking about basically refers to the content in books, knowledge and the like. And the information I am talking about is not these, but something more essential. For example, the light, ashes, heat, radiation, etc. produced by the burning of a book. In theory, if you can concentrate all these things again, you can still restore the book to its original appearance.

In other words, even if the book is gone, the information in the book still exists, but it is difficult for us to obtain it.

After you fall into the black hole, your information does not disappear, but is stored on the event horizon on the surface of the black hole. The event horizon is like a USB flash drive that can store information. The amount of information stored is proportional to the surface area of ??the event horizon.

In other words, although you are reduced to ashes at the event horizon, strictly speaking you have not disappeared, because everything about you remains on the surface of the event horizon. But from your perspective, you go beyond the event horizon and right into the central singularity.

In this way, there are two you: the you in the event horizon, that is to say, the you stored in the event horizon in a two-dimensional encoding, just like a holographic image. And you inside the black hole.

So which one is the real you? Which one is true? Which one is illusory?

Both you are real, but there is only one you. It’s just that your information is in two different places at the same time. No one is more real than the other.

Speaking of which, we have to talk about our universe. Our observable universe actually has an event horizon, so does this event horizon store a massive amount of information just like the event horizon of a black hole?

Indeed, many scientists hold this view, and most of them verify it from string theory and mathematical analysis. This view holds that the objective real world we see every day and the three-dimensional objects we see are actually just projections of two-dimensional information on the event horizon surface of the universe!

Both fantasy and reality!

At present, research on this aspect has just begun. There are many problems that need to be solved. It is difficult to make accurate judgments based on the current level of human science and technology, and it is difficult to prove current speculations experimentally. .

If the above point of view is true, does it mean that everything we see every day is illusion? A little scary.

However, even if this is the case, we don’t need to worry too much. After all, the so-called illusion and reality are originally defined artificially. There is no absolute dividing line between the two. Everything is just our experience.

To put it bluntly, what we experience is reality.

Unless one can define illusion and reality from God’s perspective!