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High Energy Physics - Phenomenology

arXiv:1909.11090 (hep-ph)
[Submitted on 24 Sep 2019]

Title:What if Planet 9 is a Primordial Black Hole?

Authors:Jakub Scholtz, James Unwin
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    Abstract: We highlight that the anomalous orbits of
    Trans-Neptunian Objects (TNOs) and an excess in microlensing
    events in the 5-year OGLE dataset can be simultaneously explained
    by a new population of astrophysical bodies with mass several
    times that of Earth ($M_\oplus$). We take these objects to be
    primordial black holes (PBHs) and point out the orbits of TNOs
    would be altered if one of these PBHs was captured by the Solar
    System, inline with the Planet 9 hypothesis. Capture of a free
    floating planet is a leading explanation for the origin of Planet
    9 and we show that the probability of capturing a PBH instead is
    comparable. The observational constraints on a PBH in the outer
    Solar System significantly differ from the case of a new ninth
    planet. This scenario could be confirmed through annihilation
    signals from the dark matter microhalo around the PBH.

Comments:          7 pages, 1 exact scale illustration of a 5 Earth
                   mass black hole
                   High Energy Physics - Phenomenology (hep-ph);
Subjects:          Cosmology and Nongalactic Astrophysics
                   (astro-ph.CO); Earth and Planetary Astrophysics
                   (astro-ph.EP)
Journal reference: Phys. Rev. Lett. 125, 051103 (2020)
DOI:               10.1103/PhysRevLett.125.051103
Report number:     IPPP/19/73
Cite as:           arXiv:1909.11090 [hep-ph]
                   (or arXiv:1909.11090v1 [hep-ph] for this version)

Submission history

From: James Unwin [view email]
[v1] Tue, 24 Sep 2019 18:00:01 UTC (19 KB)
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