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High Energy Physics - Theory

arXiv:0810.5128 (hep-th)
[Submitted on 29 Oct 2008 (v1), last revised 15 May 2009 (this version, v2)]

Title:Watching Worlds Collide: Effects on the CMB from Cosmological Bubble Collisions

Authors:Spencer Chang, Matthew Kleban, Thomas S. Levi
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Abstract: 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.
Comments: JCAP version, added references and discussion, 32 pages, 15 figures
Subjects: High Energy Physics - Theory (hep-th); Astrophysics (astro-ph); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:0810.5128 [hep-th]
  (or arXiv:0810.5128v2 [hep-th] for this version)
  https://doi.org/10.48550/arXiv.0810.5128
Journal reference: JCAP 0904:025,2009
Related DOI: https://doi.org/10.1088/1475-7516/2009/04/025

Submission history

From: Thomas S. Levi [view email]
[v1] Wed, 29 Oct 2008 19:24:03 UTC (160 KB)
[v2] Fri, 15 May 2009 23:56:49 UTC (161 KB)
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