A Complete Statistical Analysis for the Quadrupole Amplitude in an Ellipsoidal Universe

TL;DR

This paper provides a comprehensive statistical analysis of an ellipsoidal universe model, showing it likely increases the quadrupole amplitude in cosmic microwave background anisotropies, potentially addressing the low quadrupole anomaly.

Contribution

It offers the first complete statistical evaluation of the ellipsoidal universe model's impact on the quadrupole amplitude, highlighting its tendency to enhance it.

Findings

Probability of quadrupole increase exceeds decrease across parameters

Supports the ellipsoidal universe as a potential solution to the low quadrupole anomaly

Quantifies the likelihood of amplitude changes in the model

Abstract

A model of Universe with a small eccentricity due to the presence of a magnetic field at the decoupling time (i.e. an Ellipsoidal Universe) has been recently proposed for the solution of the low quadrupole anomaly of the angular power spectrum of cosmic microwave background anisotropies. We present a complete statistical analysis of that model showing that the probability of increasing of the amplitude of the quadrupole is larger than the probability of decreasing in the whole parameters' space.