Position Space CMB Anomalies from Multi-Stream Inflation

Understand

Temporary domain walls are produced during the bifurcation era of multi-stream inflation.

• The observational effects from such a domain wall to spectator field perturbations are calculated, and we expect the inflationary perturbations share similarities with the case of spectator field.
• A domain wall induces a preferred direction in the sky, affecting the angular distribution of perturbations.
• A correlated suppression of multipoles together with an alignment of multipole moments on the preferred direction are generated.