  In this work we investigate the accretion of cosmological fluids onto 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 onto
an intermediate-mass black hole is negligible. On the other hand, if cold dark
matter has a nonvanishing 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.
