Smatrix connects initial and final states from "summary" of The Quantum Theory of Fields by Steven Weinberg,Weinberg S
The idea that the Smatrix connects initial and final states lies at the heart of quantum field theory. By considering the evolution of systems in terms of interactions between particles, we can gain insight into the underlying structure of physical reality. The Smatrix acts as a bridge between the state of a system before and after an interaction takes place, allowing us to track the changes that occur. In quantum field theory, the initial state of a system is represented by a set of particles in specific quantum states. These particles interact with each other according to the laws of quantum mechanics, resulting in a new configuration of particles in the final state. The Smatrix encapsulates this transformation, encoding the probabilities for different outcomes to occur. Through the Smatrix, we can calculate the probabilities of different final states arising from a given initial state. This allows us to make predictions about the behavior of particles in various physical processes. By studying t...
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