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Extension principles for the Einstein Yang--Mills system

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arxiv 2503.19403 v2 pith:U7ESPBYX submitted 2025-03-25 gr-qc math.APmath.DG

classification gr-qcmath.APmath.DG
keywords yang--millssystemeinsteinextensionfieldmasslessscalaraddition
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abstract

We prove the local existence theorem and establish an extension principle for the spherically symmetric Einstein Yang--Mills system (SSEYM) with $H^1$ data. This in addition implies Cauchy stability for the system. In contrast to a massless scalar field, the purely magnetic Yang--Mills field in spherical symmetry satisfies a wave-type equation with a singular potential. As a consequence, the proof of Christodoulou [10], based on an $L^\infty-L^\infty$ estimate, fails in the Yang--Mills context. Instead, we employ an $L^2$-based method, which is valid for both massless and massive scalar matter fields as well.

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Cited by 1 Pith paper

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  1. Formation of trapped surfaces for the spherically symmetric Einstein-Yang-Mills system with non-trivial incoming data

    gr-qc 2026-08 conditional novelty 6.0 of 10

    A trapped-surface formation theorem is established for the spherically symmetric Einstein-Yang-Mills system with nontrivial characteristic incoming data.

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