What is the main principle of A Brief History of Time ? What can we understand through it?

The benevolent see the benevolent, and the wise see the wise.

A Brief History of Time is mainly about Hawking's theory of the universe.

Many of them are just conjectures, thinking wormholes, singularities. You can't take it as a fact.

Life cannot exist below two-dimensional space.

Although the book "A Brief History of Time" is thin, the content in the book is extremely profound, from the universe and galaxies to atoms and neutrons.

But it doesn't matter if you don't understand it, there is a saying called "insiders look at the doorway, laymen look at the lively", most of us are ordinary people, not many people are physics experts, after reading this book, as laymen, although we will not understand some concepts very well, but will be about the universe, galaxies, black holes, singularities, general relativity.

Quantum mechanics and so on have a basic understanding.

This book will take us to unveil the mysterious veil of the universe little by little, step by step to get closer to the truth of the universe, to understand the formation of the universe, to understand the big **, to understand the stars, to understand time and space, to understand wormholes, and to understand the paradox of rock guessing twins.

The title of A Brief History of Time indicates that it is a concise history of time, and time is a major theme of the book. The first issue about time in the book is the relativistic view of space-time, Albert Einstein.

The theory of relativity that was founded allows us to realize the relativity of space-time, and that time and space are important for different frames of reference.

The observer is no longer the same physical quantity. The relativistic effect will cause a time dilation effect, if one clock is in motion and the other clock is relatively stationary, the former will travel more slowly than the latter. If one clock is in a strong field and the other is in a weak gravitational field, the former time rough type moves slower than the latter.

In addition to temporal relativity, the book also presents the evolutionary history of the universe. According to the big ** theory, the universe began 13.8 billion years ago and has been expanding until now, and the current expansion rate is gradually increasing. How the universe will evolve in the future, how time will pass, Stephen Hawking.

It's all done in the book**.

In addition, the book also mentions wormholes and time travel. Stephen Hawking** wormholes are used for interstellar travel.

possibilities. In addition, Hawking denied going back in time.

time travel and how to achieve time travel to the future. On the other hand, Hawking also discussed black holes and the grand unified theory in physics.

The theme idea is to introduce the latest developments to you in our universe and space.

The theme of this book is like chain selling, and I feel that it wants to tell us about the big black hole and the relevant principles in the arrow of time. It is to allow ordinary people to accept some related scumbag teasing.

It is to introduce me to the universe, let us know more about science, and also let us understand some scientific theories of black holes.

The main idea of "A Brief History of Early Time" is to seek () quiet rules.

a.Unify the four basic forces of nature.

b.Gravitational field theory.

c.Theory of quantum states.

d.Theory of Quantum Gravity.

Correct Answer: Enlightenment shed d

This summer, after reading "A Brief History of Time", I realized that I had it in front of this master of physicsHow smallStephen hawking. What the master brings to us is the essence of physics, and according to his words, I have some ideas of my own.

First of all, the ideas mentioned in the book, which are of great significance for the progress of modern physics, that is, the combination of classical general relativity and quantum theory. In the nearly 100-year history of modern physics, many people have made similar attempts, including Einstein, who himself was working on an extended theory of relativity in harmony with quantum theory, but he retreated, and finally he set his sights on the cosmological constant, which was the failure of this genius. Many people have done many marginal disciplines for the harmony of quantum theory and relativity, but I personally think that none of them are as thorough as Master Hawking's work - quantum gravitational theory, quantum is the discontinuous motion of material particles, and all of Zheng Wangjian's quantum puzzles originate from this discontinuous motion.

The combination of quantum theory and gravity, known as the theory of quantum gravity, is still in the research stage. The history of this theory is long, the famous general relativityist Penrose after Chandrasekhar solved the Dirac equation, and Hawking proved the area theorem of black holes together, and then Hawking made the black hole thermal radiation theorem, which naturally reminds people of the physical quantity called entropy from the non-deductive performance of the area of the black hole, and the black hole also has the property of entropy.

From a mathematical point of view, regardless of whether the theory of quantum gravity is a grand unified theory or not, it has its significance and has a good impact on physics.

Stephen Hawking's description of the arrow of time is very interesting, and I can't help but think of a time when philosophy and scientific theory went hand in hand, but now science is so mathematical for philosophers that Wittgenstein said that philosophy is only the language of analysis.

There are three types of time arrows, 1. Thermodynamic arrows, according to the second law of thermodynamics, entropy always increases over time, and vice versa, time goes by with the increase of entropy. 2. Psychological time arrow, that is, the direction in which we think time passes. 3. The cosmological arrow of time, the universe expands over time, and vice versa, time moves with the expansion of the universe.

Because it is very difficult to use mathematical methods to establish a steady-state model of the universe, we stipulate that time in our world is real time, and we can assume that there is a virtual time, and we can use imaginary numbers to measure time, and there is no singularity in the universe of imaginary time, so in imaginary time, there will be no scientific laws that will be violated, but in real time, there is bound to be a singularity, and scientific laws are destined to be violated here, but our doubts are whether it must be real time in the world we live in? Our current findings are not enough to prove that there is no singularity in our universe, and that would be a mystery.