Doppler boosted dust emission and CIB-galaxy cross-correlations: a new
  probe of cosmology and astrophysics
  We identify a new cosmological signal, the Doppler-boosted Cosmic Infrared
Background (DB-CIB), arising from the peculiar motion of the galaxies whose
thermal dust emission source the cosmic infrared background (CIB). This new
observable is an independent probe of the cosmic velocity field, highly
analogous to the well-known kinematic Sunyaev-Zel'dovich (kSZ) effect.
Interestingly, DB-CIB does not suffer from the 'kSZ optical depth degeneracy',
making it immune from the complex astrophysics of galaxy formation. We forecast
that the DB-CIB effect is detectable in the cross-correlation of CCAT-Prime and
DESI-like experiments. We show that it also acts as a new CMB foreground which
can bias future kSZ cross-correlations, if not properly accounted for.
