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No black holes from cosmic string cusps

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arxiv 2101.05040 v1 pith:IQQLF35X submitted 2021-01-13 astro-ph.CO gr-qchep-ph

classification astro-ph.COgr-qchep-ph
keywords blackcosmiccuspsstringcuspenergyframehole
verification ladder T0 review T1 audit T2 compute T3 formal

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Recent work by Jenkins and Sakellariadou claims that cusps on cosmic strings lead to black hole production. To derive this conclusion they use the hoop conjecture in the rest frame of the string loop, rather than in the rest frame of the proposed black hole. Most of the energy they include is the bulk motion of the string near the cusp. We redo the analysis taking this into account and find that cusps on cosmic strings with realistic energy scale do not produce black holes, unless the cusp parameters are extremely fine-tuned.

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