The authors re-prove global existence for null-condition semilinear waves on extremal Reissner-Nordström with a weaker bootstrap that avoids Y commutation, yielding a simpler proof.
Global spherically symmetric solutions of non-linear wave equations with null condition on extremal Reissner-Nordström spacetimes
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Semilinear wave equations on extremal Reissner-Nordstr\"om black holes revisited
The authors re-prove global existence for null-condition semilinear waves on extremal Reissner-Nordström with a weaker bootstrap that avoids Y commutation, yielding a simpler proof.