# From inflation to recent cosmic acceleration: The fermionic Elko field driving the evolution of the universe

## TL;DR

This paper models the universe's evolution from inflation to current acceleration using the fermionic Elko field, demonstrating its ability to naturally reproduce all cosmic phases with results aligning with standard cosmology.

## Contribution

It introduces a comprehensive cosmological model driven by the Elko fermionic field, including detailed dynamics and numerical analysis consistent with observations.

## Key findings

- Elko field can drive all cosmic phases from inflation to acceleration
- Numerical results match standard cosmological parameters
- Inflation possibly explained by Pauli exclusion principle

## Abstract

In this paper we construct the complete evolution of the universe driven by the mass dimension one dark spinor called Elko, starting with inflation, passing by the matter dominated era and finishing with the recent accelerated expansion. The dynamic of the fermionic Elko field with a symmetry breaking type potential can reproduce all phases of the universe in a natural and elegant way. The dynamical equations in general case and slow roll conditions in the limit $H\ll m_{pl}$ are also presented for the Elko system. Numerical analysis for the number of e-foldings during inflation, energy density after inflation and for present time and also the actual size of the universe are in good agreement with the standard model of cosmology. An interpretation of the inflationary phase as a result of Pauli exclusion principle is also possible if the Elko field is treated as an average value of its quantum analogue.