Fresh Inflation from Five-Dimensional Vacuum State

I study fresh inflation from a five-dimensional vacuum state, where the fifth dimension is constant. In this framework, the universe can be seen as inflating in a four-dimensional Friedmann-Robertson-Walker metric embedding in a five-dimensional metric. Finally, the experimental data ns = 1 (BOOMERANG-98 and MAXIMA-1, taken together COBE DMR), are consistent with \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$\frac{{{\text{p + }}\rho _t }}{{\rho _t }} \simeq {1 \mathord{\left/ {\vphantom {1 3}} \right. \kern-\nulldelimiterspace} 3}$$ \end{document} in the fresh inflationary scenario.