Primordial inhomogeneities from massive defects during inflation
  We consider the imprints of local massive defects, such as a black hole or a
massive monopole, during inflation. The massive defect breaks the background
homogeneity. We consider the limit that the physical Schwarzschild radius of
the defect is much smaller than the inflationary Hubble radius so a
perturbative analysis is allowed. The inhomogeneities induced in scalar and
gravitational wave power spectrum are calculated. We obtain the amplitudes of
dipole, quadrupole and octupole anisotropies in curvature perturbation power
spectrum and identify the relative configuration of the defect to CMB sphere in
which large observable dipole asymmetry can be generated. We observe a curious
reflection symmetry in which the configuration where the defect is inside the
CMB comoving sphere has the same inhomogeneous variance as its mirror
configuration where the defect is outside the CMB sphere.
