Singularities in Silent Universes: State of the Art

TL;DR

This paper reviews silent universe models and examines Bianchi Type-I models with magnetic fields, revealing oscillatory singularities that challenge the idea that matter fields are negligible near singularities.

Contribution

It provides an overview of silent models and demonstrates that magnetic fields in Bianchi Type-I models lead to oscillatory singularities, countering previous assumptions.

Findings

Magnetic fields induce oscillatory features near singularities.

Bianchi Type-I models with magnetic fields challenge existing folklore.

Silent models' current understanding is summarized.

Abstract

After a brief overview of the so-called silent models and their present status, we consider the subclass of Bianchi Type--I models with a magnetic field source. Due to the presence of the magnetic field, the initial singularity shows ``oscillatory'' features reminiscent of the Bianchi Type--IX case. The Bianchi Type--I models with a magnetic field are therefore a counterexample to the folklore that matter fields can be neglected in the vicinity of the singularity.