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No hair theorem for massless scalar fields outside asymptotically flat horizonless reflecting compact stars

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arxiv 1904.00911 v2 pith:7PADO6W3 submitted 2019-04-01 gr-qc hep-phhep-th

classification gr-qchep-phhep-th
keywords scalarcompacthorizonlessreflectingstarsasymptoticallyfieldsflat
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In a recent paper, Hod started a study on no scalar hair theorem for asymptotically flat spherically symmetric neutral horizonless reflecting compact stars. In fact, Hod's approach only rules out massive scalar fields. In the present paper, for massless scalar fields outside neutral horizonless reflecting compact stars, we provide a rigorous mathematical proof on no hair theorem. We show that asymptotically flat spherically symmetric neutral horizonless reflecting compact stars cannot support exterior massless scalar field hairs.

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  1. The shadow and quasinormal modes of the asymptotically flat hairy black holes with a dilaton potential

    gr-qc 2025-08 conditional novelty 5.0 of 10

    For exact asymptotically flat hairy charged black holes with a dilaton potential, the shadow radius, photon-orbit Lyapunov exponent, and scalar quasinormal frequencies are computed, showing strong coupling dependence ...

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