On the detectability of gravitational waves from primordial black holes
  orbiting Sgr A*
  In this work we characterize the expected gravitational wave signal
detectable by the planned space-borne interferometer LISA and the proposed next
generation space-borne interferometer $\mu$Ares arising from a population of
primordial black holes orbiting Sgr A*, the super-massive black hole at the
Galactic center. Assuming that such objects indeed form the entire diffuse mass
allowed by the observed orbit of S2 in the Galactic center, under the
simplified assumption of circular orbits and monochromatic mass function, we
assess the expected signal in gravitational waves, either from resolved and
non-resolved sources.
