Merger rate distribution of primordial black hole binaries with electric
  charges
  We consider gravitational radiation and electromagnetic radiation from point
mass binary with electric charges in a Keplerian orbit, and calculate the
merger rate distribution of primordial black hole binaries with charges and a
general mass function by taking into account gravitational torque and
electromagnetic torque by the nearest primordial black hole. We apply the
formalism to the extremal charged case and find that
$\alpha=-(m_i+m_j)^2\partial^2 \ln {\cal R}(m_i,m_j)/\partial m_i \partial
m_j=12/11$, which is independent of the mass function.
