1.1 The Big Bang Theory

The Big Bang event is a physical theory that describes how the universe expanded from an initial state of high density and temperature. Various cosmological models of the Big Bang explain the evolution of the observable universe from the earliest known periods through its subsequent large-scale form.

Crucial evidence for this expansion includes the cosmic microwave background radiation and the observed redshift of distant galaxies. In this section, we will analyze the mathematical frameworks that support these observations...