Asymmetry in the reconstructed deceleration parameter

TL;DR

This paper investigates the directional dependence of the reconstructed deceleration parameter using supernova datasets, revealing a significant asymmetry at low redshift possibly linked to large-scale structures.

Contribution

It introduces an analysis of orientation dependence in the deceleration parameter reconstruction, highlighting a notable asymmetry in the data.

Findings

Asymmetry in the reconstructed $q(z)$ at low redshift between opposite directions.

Absence of a low redshift transition in one direction and a sharp transition in the opposite.

Potential influence of large-scale structures on the observed anisotropy.

Abstract

We study the orientation dependence of the reconstructed deceleration parameter as a function of redshift. We use the Union 2 and Loss datasets, by using the well known preferred axis discussed in the literature, finding the best fit reconstructed deceleration parameter. We found that a low redshift transition of the reconstructed $q(z)$ is clearly absent in one direction and amazingly sharp in the opposite one. We discuss the possibility that such a behavior can be associated with large scale structures affecting the data.