The degree of generality of inflation in FRW models with massive scalar field and hydrodynamical matter

TL;DR

This paper investigates how the presence of hydrodynamical matter influences the likelihood of inflation in FRW cosmological models with a massive scalar field, showing that fluids can significantly increase inflation probability.

Contribution

It quantifies the impact of hydrodynamical matter on the probability of inflation in closed FRW models with a massive scalar field.

Findings

In closed models, the ratio of solutions without inflation can reach 60%.

In models without fluid, the ratio is approximately 30%.

Hydrodynamical matter increases the likelihood of inflation.

Abstract

Friedmann-Robertson-Walker cosmological models with a massive scalar field are studied in the presence of hydrodynamical matter in the form of a perfect fluid. The ratio of the number of solutions without inflation to the total number of solutions is evaluated, depending on the fluid density. It is shown that in a closed model this ratio can reach 60%, by contrast to $\sim 30 %$ in models without fluid.