Title
Blow-up of waves on singular spacetimes with generic spatial metrics
Abstract
We study the asymptotic behaviour of solutions to the linear wave equation on cosmological spacetimes with Big Bang singularities and show that appropriately rescaled waves converge against a blow-up profile. Our class of spacetimes includes Friedman–Lemaître–Robertson–Walker (FLRW) spacetimes with negative sectional curvature that solve the Einstein equations in the presence of a perfect irrotational fluid with p=(γ−1)ρ. As such, these results are closely related to the still open problem of past nonlinear stability of such FLRW spacetimes within the Einstein scalar field equations. In contrast to earlier works, our results hold for spatial metrics of arbitrary geometry, hence indicating that the matter blow-up in the aforementioned problem is not dependent on spatial geometry. Additionally, we use the energy estimates derived in the proof in order to formulate open conditions on the initial data that ensure a non-trivial blow-up profile, for initial data sufficiently close to the Big Bang singularity and with less harsh assumptions for γ<2.
Keywords
Wave equationBig Bang singularityBlow-up profileCosmology
Object type
Language
English [eng]
Persistent identifier
phaidra.univie.ac.at/o:1630936
Appeared in
Title
Letters in Mathematical Physics
Volume
112
Issue
2
ISSN
0377-9017
Issued
2022
Publication
Springer Science and Business Media LLC
Version type
Date issued
2022
Access rights
Rights
Rights statement
© The Author(s) 2022
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