Beta Phase: Square45 is currently in beta testing. Expect some features or content to be incomplete or missing.
45

Scale Factor

A function describing the relative expansion of the universe over time, a fundamental component of inflationary models.
📜

The statement of the theorem

Define the scale factor a(t)a(t) as the function describing the relative expansion of the spatial metric over cosmic time tt. It is normalized such that a(t0)=1a(t_0) = 1. The evolution of a(t)a(t) is governed by the Friedmann equations and relates the physical distance Dphys(t)D_{phys}(t) to the comoving distance Dcom(t)D_{com}(t) via:\nDphys(t)=a(t)Dcom(t)D_{phys}(t) = a(t) D_{com}(t)
Source: Wikipedia