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Dark matter and dark energy accretion on to intermediate-mass black holes

Authors

  • C. Pepe,

    Corresponding author
    1. Instituto de Astronomía y Física del Espacio, Casilla de Correo 67, Suc. 28, 1428 Buenos Aires, Argentina
    2. Consejo Nacional de Investigaciones Científicas y Técnicas, Rivadavia 1917, C1033 AAJ, Buenos Aires, Argentina
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  • L. J. Pellizza,

    1. Instituto de Astronomía y Física del Espacio, Casilla de Correo 67, Suc. 28, 1428 Buenos Aires, Argentina
    2. Consejo Nacional de Investigaciones Científicas y Técnicas, Rivadavia 1917, C1033 AAJ, Buenos Aires, Argentina
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  • G. E. Romero

    1. Consejo Nacional de Investigaciones Científicas y Técnicas, Rivadavia 1917, C1033 AAJ, Buenos Aires, Argentina
    2. Instituto Argentino de Radioastronomía, C.C.S., 1894 Villa Elisa, Pcia. de Buenos Aires, Argentina
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E-mail: carolinap@iafe.uba.ar

ABSTRACT

In this work we investigate the accretion of cosmological fluids on to an intermediate-mass black hole at the centre of a globular cluster, focusing on the influence of the parent stellar system on the accretion flow. We show that the accretion of cosmic background radiation and the so-called dark energy on to an intermediate-mass black hole is negligible. On the other hand, if cold dark matter has a non-vanishing pressure, the accretion of dark matter is large enough to increase the black hole mass well beyond the present observed upper limits. We conclude that either intermediate-mass black holes do not exist, or dark matter does not exist, or it is not strictly collisionless. In the latter case, we set a lower limit for the parameter of the cold dark matter equation of state.

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