In this lecture, the professor first reviewed supernovae Ia and vacuum energy density, then talked about problems of the conventional (non-inflationary) hot big bang model.

In this lecture, the professor discussed the mechanism of inflation, original inflationary model, and new inflationary scenario.

In this lecture, the professor first talked about supernovae type Ia; summarized the age of the universe and radiation flux versus redshift; and talked about vacuum energy density.