We extend our previous work on the cosmology of Coleman-de Luccia bubble collisions. Within a set of approximations we calculate the effects on the cosmic microwave background (CMB) as seen from inside a bubble which has undergone such a collision. We find that the effects are always qualitatively similar-an anisotropy that depends only on the angle to the collision direction-but can produce a cold or hot spot of varying size, as well as power asymmetries along the axis determined by the collision. With other parameters held fixed the effects weaken as the amount of inflation which took place inside our bubble grows, but generically survive order 10 efolds past what is required to solve the horizon and flatness problems. In some regions of parameter space the effects can survive arbitrarily long inflation.
In particular REF studied in detail the effects on the cosmic microwave background of collision lightcones that bisect the observable part of the last scattering surface.
Watching Worlds Collide: Effects on the CMB from Cosmological Bubble Collisions
JCAP 0904:025,2009
Physics