Fresh inflation from five-dimensional vacuum state

TL;DR

This paper explores a fresh inflation model derived from a five-dimensional vacuum state, showing that a four-dimensional universe can inflate consistently with observational data, particularly with a spectral index of approximately 1.

Contribution

It introduces a novel five-dimensional vacuum framework for fresh inflation, linking higher-dimensional geometry with observable inflationary parameters.

Findings

The model yields a spectral index n_s ≈ 1.

The universe's inflationary behavior is consistent with a 5D vacuum state.

The scenario aligns with observational data on cosmic inflation.

Abstract

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 FRW metric embedding in a five-dimensional metric. Finally, the experimental data $n_s=1$ are consistent with $(p+\rho_t)/\rho_t \simeq1/3$ in the fresh inflationary scenario.