Inhomogenized sudden future singularities

TL;DR

This paper demonstrates that sudden future singularities can occur in inhomogeneous Stephani universe models, revealing new types of singularities and challenging previous assumptions about energy conditions in such cosmologies.

Contribution

It introduces the occurrence of sudden future singularities in inhomogeneous Stephani models, expanding understanding beyond homogeneous cases.

Findings

Sudden future singularities can occur in inhomogeneous models.

These singularities are pressure-based and independent of spatial density singularities.

Energy conditions may not be satisfied in inhomogeneous sudden singularities.

Abstract

We find that sudden future singularities may also appear in spatially inhomogeneous Stephani models of the universe. They are temporal pressure singularities and may appear independently of the spatial finite density singularities already known to exist in these models. It is shown that the main advantage of the homogeneous sudden future singularities which is the fulfillment of the strong and weak energy conditions may not be the case for inhomogeneous models.