Proof of the cosmic no-hair conjecture in the $\mathbb T^3$-Gowdy symmetric Einstein–Vlasov setting

Håkan Andréasson ; Hans Ringström

Journal of the European Mathematical Society, Tome 18 (2016) no. 7, pp. 1565-1650.

Résumé

The currently preferred models of the universe undergo accelerated expansion induced by dark energy. One model for dark energy is a positive cosmological constant. It is consequently of interest to study Einstein’s equations with a positive cosmological constant coupled to matter satisfying the ordinary energy conditions: the dominant energy condition etc. Due to the difficulty of analysing the behaviour of solutions to Einstein’s equations in general, it is common to either study situations with symmetry, or to prove stability results. In the present paper, we do both. In fact, we analyse, in detail, the future asymptotic behaviour of T3-Gowdy symmetric solutions to the Einstein–Vlasov equations with a positive cosmological constant. In particular, we prove the cosmic no-hair conjecture in this setting. However, we also prove that the solutions are future stable (in the class of all solutions). Some of the results hold in a more general setting. In fact, we obtain conclusions concerning the causal structure of T2-symmetric solutions, assuming only the presence of a positive cosmological constant, matter satisfying various energy conditions and future global existence. Adding the assumption of T3-Gowdy symmetry to this list of requirements, we obtain C0-estimates for all but one of the metric components. There is consequently reason to expect that many of the results presented in this paper can be generalised to other types of matter.

Détail

DOI : 10.4171/jems/623

Classification : 35-XX, 83-XX
Keywords: Einstein–Vlasov system, cosmic no-hair conjecture, Gowdy symmetry