Tidal Disruption Events and Gravitational Waves from Intermediate-mass
  Black Holes in Evolving Globular Clusters Across Space and Time
  We present a semi-analytic model for self-consistently evolving a population
of globular clusters (GCs) in a given host galaxy across cosmic time. We
compute the fraction of GCs still hosting intermediate-mass black holes (IMBHs)
at a given redshift in early and late type galaxies of different masses and
sizes, and the corresponding rate of tidal disruption events (TDEs), both
main-sequence (MS) and white dwarf (WD) stars. We find that the integrated TDE
rate for the entire GC population can exceed the corresponding rate in a given
galactic nucleus and that $\sim 90$% of the TDEs reside in GCs within a maximum
radius of $\sim 2-15$ kpc from the host galaxy's center. This suggests that
observational efforts designed to identify TDEs should not confine themselves
to galactic nuclei alone, but should also consider the outer galactic halo
where massive old GCs hosting IMBHs would reside. Indeed, such off-centre TDEs
as predicted here may already have been observed. MS TDE rates are more common
than WD TDE rates by a factor 30 (100) at $z\leq 0.5$ ($z=2$). We also
calculate the rate of IMBH-SBH mergers across cosmic time, finding that the
typical IMRI rate at low redshift is of the order of $\sim 0.5-3$ Gpc$^{-3}$
yr$^{-1}$, which becomes as high as $\sim 100$ Gpc$^{-3}$ yr$^{-1}$ near the
peak of GC formation. Advanced LIGO combined with VIRGO, KAGRA, ET and LISA
will be able to observe the bottom-end and top-end of the IMBH population,
respectively.
