At one end, we have quantum field theory, which has led us to the Standard Model of particle physics and which accounts for three of the four known forces in the universe. At the other extreme, we have the general theory of relativity, which gives us the Standard Model of cosmology that encompasses the other force, gravity. This standard model of the very large is called a variety of different names, such as the concordance model, or the Lambda–cold dark matter model, or the Big Bang cosmology model. I will discuss it more fully in the next chapter.
