Probing Beyond Standard Model via Hawking Radiated Gravitational Waves
  We propose a novel technique to probe the beyond standard model (BSM) of
particle physics. The mass spectrum of unknown BSM particles can be scanned by
observing gravitational waves (GWs) emitted by Hawking radiation of black
holes. This is because information on the radiation of the BSM particles is
imprinted in the spectrum of the GWs. We fully calculate the GW spectrum from
evaporating black holes taking into account the greybody factor. As an
observationally interesting application, we consider primordial black holes
which evaporate in the very early universe. In that case, since the frequencies
of GWs are substantially redshifted, the GWs emitted with the BSM energy scales
become accessible by observations.
