
There are many inflation models/hypothesis. If we know the correct theory of quantum gravity/cosmology,
then this can be used to find a good hypothesis of inflation. In this presentation, I will use
the noboundary proposal to judge a certain inflation model, whether it is good or not in the point of
view of probability. There are three ways to make a good inflation hypothesis: the first inflation
happened at the high energy scale, the inflation potential is finely tuned, or there should be an additional
factor that is different from Einstein gravity. I will illustrate some useful examples.
