Brane assisted quintessential inflation with transient acceleration

TL;DR

This paper presents a braneworld model of quintessential inflation using a modified exponential potential, demonstrating compatibility with observations and identifying conditions for transient and permanent cosmic acceleration.

Contribution

It introduces a new inflationary model with a specific potential in the braneworld context, analyzing its evolution and acceleration phases.

Findings

Model fits observational constraints across parameter space

Transient acceleration occurs for specific parameter ranges

Steep parameter alpha constrained between 5.3 and 10.8

Abstract

A simple model of quintessential inflation with the modified exponential potential exp(-\alpha \phi) [A + (\phi-\phi_0)^2] is analyzed in the braneworld context. Considering reheating via instant preheating, it is shown that the evolution of the scalar field \phi from inflation to the present epoch is consistent with the observational constraints in a wide region of the parameter space. The model exhibits transient acceleration at late times for 0.96 < A \alpha^2 < 1.26 and 271 < \phi_0 \alpha < 273, while permanent acceleration is obtained for 2.3 10^{-8} < A \alpha^2 < 0.98 and 255 < \phi_0 \alpha < 273. The steep parameter \alpha is constrained to be in the range 5.3 < \alpha < 10.8.