Cosmological Collider Signatures of Massive Vectors from Non-Gaussian
  Gravitational Waves
  The cosmological collider provides a model-independent probe of particle
physics during inflation. We extend the study of cosmological collider physics
to much smaller scales through gravitational wave (GW) probes. With a
Chern-Simons interaction, a massive vector field can obtain a chemical
potential and its particle production can cause significant non-Gaussian GW
signals. We calculate the mass and spin dependences of the induced GW 3-point
correlation function in the squeezed limit, and estimate its amplitude. Such
signals may be detectable in the current and upcoming GW interferometer
experiments.
