Are we survivors of the sudden past singularity?

TL;DR

This paper explores the plausibility of cosmological models with a past type II singularity, constraining them with observational data and finding they remain consistent with current measurements.

Contribution

It constructs and tests a novel class of models featuring a past singularity, using observational data to assess their viability.

Findings

Models with past type II singularity are consistent with current observations.

Current kinematical tests cannot exclude these singularity-based models.

The study provides constraints on parameters of such cosmological models.

Abstract

In this paper, we investigate the viability of cosmological models featuring a type II singularity that occurs during the past evolution of the Universe. We construct a scenario in which the singularity arises and then constrain the model parameters using observational data from Type Ia Supernovae, Cosmic Chronometers, and Gamma Ray Bursts. We find that the resulting cosmological models based on scenarios with the past type II singularity cannot be excluded by kinematical tests using current observations.