Sender: Redoo (Elf) under the stars), the letter area: Helloscience Title: Reprinted: Cosmology Theory Send Station: The Big Green (Fri Apr 26 01:28:47 2002), transfer
Sender: Fisherdad (Fishing Male), Signature: Science Title: Before the Big Bang, I briefly say a few sentences: The Unknown Space (Fri Apr 26 01:06:15 2002) WWW-POST
The so-called big explosion refers to the universe has experienced a high-temperature high-density period, and there is already a lot of adequate evidence in this point, and has been widely received by the scientific community. From the evolution of the big explosion to today's universe, there is a considerable detailed theory, If you want to know about these knowledge, you may wish to read popular science. In this regard, I recommend Silk's Big Bang. This is more than that of Hawko's book and closer to observe, after reading, after reading, for modern cosmology There will be a basic understanding (there is no such effect after reading, you still don't understand), especially suitable for a certain physics foundation but learn more about the cosmology. In addition, John Barrow, Alan Guth Lawrence Krauss, Martin Rees also wrote the science of cosmology, or read (these people are all kinds of cosmology). In addition, the super string (such as Brian Greene, M. Kaku) and the gravitational people (Roger Penrose, Kip Thorne, Lee Smolin, John Wheeler) also often introduce this content. Cosmology has several major breakthroughs in recent years, so the study should be Read the last two or three years.
However, the current physical theory still does not describe the extremely early universe of energy density - not no theory, but there are many possible theories, but no one is completely satisfactory. So, what happened before the big explosion What, or this "previous" is still meaningful, it can only be guess. At present, there are many conjectures that are more known to discuss more:
1. Inflation theory (Inflation THEORY) This is the current standard theory. The accelerated expansion that has occurred in the universe. This theory can explain the integrity of the universe, its two major prophesies, that is, the space of the universe, and the universe The density disturbance of the original perturbation is basically confirmed. There are many kinds of skyrocketing theory. According to the Chaotic Inflation Theory, which is proposed by Linde, the universe has been in the fluid. Some of them sometimes meet the conditions of skyrocket, so it has skyrocketed, this piece of space has risen into our universe, but other parts still exist. About this theory, please refer to the provision of skyrocketing theory Alan Guth Write Inflation A book (science reading).
2. Quantum universe believes that the early universe is required to use quantum time and space. An example is the boundless theory of Hawkin and HartLe. This theory believes that early space and time must be described in quantum theory, there is no one in quantum Boundary solution, talk about the big explosion "previous" meaningless, because the classic time concept is no longer.
3. Front of the big explosion - PRE-BIG BANG ---- String Cosmology This is a theory of Veneziano (founders founder) and his students. Its starting point is in strings During duality, this theoretical microastmost is no longer suitable for the actual physics when a theoretical failure is, but these difficulties can be used in the same theory of non-microastly descriptions. The microastmost is described. Veneziano believes that if we consider the inverse process of the big explosion, when we get back to getting closer to large explosions, it is getting higher and higher according to our theoretical energy density, and the time and space scale is getting smaller, but At a time, you should change the dual theory. From this theory look at the scale, the energy is getting lower and lower, so there is no problem. However, some prophets of this theory are not in conformity. Another kind-in Theory is Brandenberger and VAFA's theory of membrane (Brane Gas), and believes that there are some multi-dimensional films before the big explosion. Later, a few of them caused three-dimensional rising because of the topology, which explains why there are three-dimensional space.
4. Fire Rebirth (Ekpyrotic) Theory. This is Steinhardt, Turok, and their students raised a M-theoretical model last year. The two membranes of high dimensional spaces were originally parallel to each other. Later, collisions form a large explosion. Cyclic Model. This is the oldest idea. There are many universities in ancient universities and destroyed and destroyed. In modern, the founders of the cosmology are as Friedman, Tolman, Dicke, etc. Over this model, that is, the universe is present, and then rebells so loop. What is the problem in the past from contraction rebooted to expand, recently Steinhardt and Turok et al. To use their firing rebirth, trying to collide with high-dimensional film To solve this problem.
6. Black hole universe theory. This theory has a lot of versions, and it is probably that the universe is formed inside when the substance is collapsed into black holes.
Outside the secondary, there are many many theories, it is difficult to say. In short, in addition to the warning theory has a certain observation support (but chaotic skyrocket is just a conjecture), it is still in a pure guess stage, and there are many difficulties. - Canglang The water is clear, you can 濯 濯; 之 的 水浊, you can 濯濯.
※ Source:. The Unknown Space bbs.mit.edu. [From: 128.100.57.85]
- ※ Source:. The Big Green Biggreen.dhs.org. [From: cheng_zhong.kiew]
