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Watching worlds collide: effects on the CMB from cosmological bubble collisions

Spencer Changa,b, Matthew Klebana and Thomas S. Levia

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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.

Keywords

CMBR experiments

cosmology of theories beyond the SM

cosmological phase transitions

string theory and cosmology

 

E-print Number: 0810.5128

Cited: by |

Refers: to

PACS

98.70.Vc Background radiations

98.80.-k Cosmology

Subjects

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 04 (April 2009)

Received 18 February 2009, accepted for publication 4 April 2009

Published 24 April 2009



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