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arXiv · 2410.10375

Oscillatory spacelike singularities: The Bianchi type $\mathrm{VI}_{-1/9}$ vacuum models

Phillipo Lappicy·Claes Uggla
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Abstract

The Bianchi type $\mathrm{VI}_{-1/9}$, $\mathrm{VIII}$ and $\mathrm{IX}$ vacuum models all have 4-dimensional Hubble-normalized state spaces and are expected to have a generic initial oscillatory singularity, but the invariant boundary sets responsible for the oscillations are much more complicated for type $\mathrm{VI}_{-1/9}$ than those of type $\mathrm{VIII}$ and $\mathrm{IX}$. For the first time, we explicitly solve the equations on these type $\mathrm{VI}_{-1/9}$ boundary sets and also introduce a new graph representation of the associated network of heteroclinic chains (i.e., sequences of solutions describing the oscillations). In particular, we give examples of networks of cyclic heteroclinic chains and show that only some of these cyclic heteroclinic chains are asymptotically relevant.

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Phillipo Lappicy, Claes Uggla. 2026-09-10. Oscillatory spacelike singularities: The Bianchi type $\mathrm{VI}_{-1/9}$ vacuum models. https://arxiv.org/abs/2410.10375

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