Low power on large scales in just enough inflation models

TL;DR

This paper explores how a kinetic energy dominated early inflation phase in simple inflation models can produce low quadrupole moments, aligning with observations, by using initial conditions consistent with current cosmological data.

Contribution

It introduces a scenario with kinetic energy domination at the start of inflation to explain low quadrupole moments in the CMB within simple inflation models.

Findings

Low quadrupole values can be achieved with specific initial conditions.

The model fits within the 1-sigma interval of cosmological parameters.

Early kinetic domination influences large-scale CMB anisotropies.

Abstract

An early stage of kinetic energy domination for inflation is applied to single-field quadratic and hybrid-type potentials considering only the amount of inflation necessary to solve the problems of the standard cosmological scenario. Using initial conditions inside the 1-sigma interval of the best-fit cosmological parameters for the potentials, low values for the quadrupole component can be obtained.