There are two kinds of physical law models controlling all aspects of the universe. Standard model and unified theory. Although the standard model is sufficient for the observable world, there are things that can not be explained or can not be predicted. Looking at high dimensions, the model breaks. In order to overcome this deficiency, physicists have established a unified theory; this name indicates that it unifies the knowledge that exists in the theory. Contributors in this field include Albert Einstein, Steven Weinberg, Sheldon Glaschau, and other modern scientists.
The currently accepted theory to explain elementary particles and their interactions is known as the standard model of elementary particle physics. The theory describes the three basic forces of nature in a unified way: electromagnetics and strong and weak nuclear forces. Despite having great success in explaining various physical phenomena, the standard model does not fully explain the reality. This is because gravity can not be introduced in the standard model, and hierarchical problems and fermion masses and dark matter structures can not be interpreted.
In the second section, the reader introduces the standard model of elementary particle physics and then continues discussing the big unified theory in chapter 3. These theories are beyond the standard model by the "extended" metrology group. In other words, choose how to include GSM in several larger G groups and select expression V of G. If it is limited to GSM, the representation is reduced to the standard model representation F. F? We will explain how to apply to SU (5) theory (Section 3.1), SO (10) theory (Section 3.2), and Pati-Salam model (Section 3.3). Of course, I will not explain the dynamics, so many people will not explain these GUTs.
The Grand Unified Theory, GUT, can infer these "more symmetric" rules. It is a more symmetric theory than the standard model, which is reduced to a standard model with lower energy. Therefore, it also tries to describe physics with higher energy. GUT is speculative physics. The standard model has been tested with myriad experiments. There is much evidence that it is an incomplete theory and there are some ambiguous clues about what the next theory is, but there is no empirical evidence that the GUT is so far SU (5) Like, it is wrong