Sudden singularities survive massive quantum particle production

TL;DR

This paper demonstrates that quantum particle production does not prevent the occurrence of sudden singularities in cosmological models, as the energy from created particles remains zero and back-reaction effects are negligible.

Contribution

It provides an exact solution showing quantum effects cannot avert sudden singularities in certain cosmological scenarios.

Findings

Quantum particle energy remains zero after regularisation.

Back-reaction from quantum effects does not alter the singularity.

Sudden singularities are robust against quantum particle production.

Abstract

We solve the Klein-Gordon equation for a massive, non-minimally coupled scalar field, with a conformal coupling, undergoing cosmological evolution from a radiation-dominated phase to a future sudden singularity. We show that, after regularisation, the energy of the created particles is zero and the back-reaction from quantum effects does not change the evolution of the universe near the future singularity and cannot prevent the finite-time sudden singularity.