Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2004-02-11
Phys.Rev.Lett.94:051101,2005
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
4 pages, 5 *.eps figures, RevTeX4; replaced by significantly revised version, to appear in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.94.051101
In this letter we investigate the nature of generic cosmological singularities using the framework developed by Uggla et al. We do so by studying the past asymptotic dynamics of general vacuum G2 cosmologies, models that are expected to capture the singular behavior of generic cosmologies with no symmetries at all. In particular, our results indicate that asymptotic silence holds, i.e., that particle horizons along all timelines shrink to zero for generic solutions. Moreover, we provide evidence that spatial derivatives become dynamically insignificant along generic timelines, and that the evolution into the past along such timelines is governed by an asymptotic dynamical system which is associated with an invariant set -- the silent boundary. We also identify an attracting subset on the silent boundary that organizes the oscillatory dynamics of generic timelines in the singular regime. In addition, we discuss the dynamics associated with recurring spike formation.
Andersson L.-L.
Elst Henk van
Lim Woei Chet
Uggla Claes
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