Suppressing CMB Quadrupole with a Bounce from Contracting Phase to Inflation

TL;DR

This paper proposes a cosmological model where a contracting phase transitions into inflation, explaining the observed low quadrupole in the CMB temperature fluctuations by modifying the early universe's evolution.

Contribution

It introduces a new scenario combining contraction and inflation phases to account for low CMB quadrupole, with detailed perturbation spectrum calculations.

Findings

The model can explain the low quadrupole in CMB data.

Perturbation spectrum matches observed large-scale anisotropies.

Provides a viable alternative to standard inflationary models.

Abstract

Recent released WMAP data show a low value of quadrupole in the CMB temperature fluctuations, which confirms the early observations by COBE. In this paper, a scenario, in which a contracting phase is followed by an inflationary phase, is constructed. We calculate the perturbation spectrum and show that this scenario can provide a reasonable explanation for lower CMB anisotropies on large angular scales.