A mass ratio limit for primordial black holes

P. Brosche*, F. Th Lentes, L. J. Tassie

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    We augment our scenario for the formation of astronomical objects from macroscopic superstrings by the assumption that the central matter keeps its identity in the fragmentation. From the condition that the angular momentum per mass squared of this matter should be less than the Kerr limit G/c, we obtain upper limits for the ratio of the mass of central black holes M(BH) to the mass M of the host object. This limit is M(BH)/M ≈ 0.001, and, expressed in observed quantities, approximately M(BH)/M ≈σ2/(v · c) where σ is the r.m.s. velocity, v the rotational velocity and c the velocity of light. The values M(BH) agree with the observed behaviour both in order of magnitude and in the variation with velocity dispersion.

    Original languageEnglish
    Pages (from-to)556-559
    Number of pages4
    JournalAstronomische Nachrichten
    Volume324
    Issue number6
    DOIs
    Publication statusPublished - 2003

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