The main points of this long section were the following.
- Cosmological scalar fields, which were introduced long before
inflation was thought of, provide a natural framework for inflation.
- Despite a wide range of motivations, most inflationary models are
dynamically equivalent to general relativity plus a single scalar field with
some potential V().
- Within this framework, solutions describing inflation are easily
found. Indeed, for many of the properties (amount of expansion, for
example), we do not even need to solve the equations of motion.
With this information under our belts, we are now able to discuss the
strongest motivation for the inflationary cosmology - that it is able to
provide an explanation for the origin of structure in the Universe.