Cosmological singularities in non-canonical models of dark energy

TL;DR

This paper investigates non-canonical scalar field dark energy models and demonstrates that they can exhibit various types of cosmological singularities, regardless of initial conditions, expanding understanding of potential cosmic endpoints.

Contribution

It provides a comprehensive analysis of singularities in three non-canonical dark energy models using the Goriely-Hyde procedure, highlighting their capacity to produce diverse singularities.

Findings

Singularities can occur in finite and infinite time in these models.

Cosmological singularities of types I-IV can manifest in non-canonical dark energy models.

Singularities are independent of initial conditions.

Abstract

The pursuit of unraveling the true essence of dark energy has become an immensely captivating endeavor in modern cosmology. Alongside the conventional cosmological constant approach, a diverse range of ideas has been proposed, encompassing scalar field-based models and various modified gravity approaches. A particularly intriguing notion involves exploring scalar field dark energy models within quantum gravitationally motivated cosmologies, with non-canonical theories standing out as a prominent candidate in this context. Hence, in this work, we investigate three widely recognized non-canonical scalar field dark energy models: phantom, quintom, and DBI dark energy models. By employing the Goriely-Hyde procedure, we demonstrate the presence of singularities in both finite and infinite time within these frameworks. and that these singularities can manifest regardless of the system's initial conditions. Moreover, we further establish how cosmological singularities of types I-IV can arise in all of these models. The work goes to show that non-canonical regimes for dark energy can allow for most of the prominent cosmological singularities for a variety of models.