Abstract
We consider the problem of small data global existence for a class of semilinear wave equations with null condition on a Lorentzian background \({(\mathbb{R}^{3 + 1}, g)}\) with a time dependent metric g coinciding with the Minkowski metric outside the cylinder \({\{(t, x) || x | \leq R\}}\). We show that the small data global existence result can be reduced to two integrated local energy estimates and demonstrate that these estimates work in the particular case when g is merely C 1 close to the Minkowski metric. One of the novel aspects of this work is that it applies to equations on backgrounds which do not settle to any particular stationary metric.
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Yang, S. Global Solutions of Nonlinear Wave Equations in Time Dependent Inhomogeneous Media. Arch Rational Mech Anal 209, 683–728 (2013). https://doi.org/10.1007/s00205-013-0631-y
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DOI: https://doi.org/10.1007/s00205-013-0631-y