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

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.

Authors:
;
Publication Date:
OSTI Identifier:
22156975
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2009; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANISOTROPY; ASYMMETRY; COLLISIONS; COSMOLOGY; HOT SPOTS; INFLATIONARY UNIVERSE; MATHEMATICAL SPACE; RELICT RADIATION

Citation Formats

Chang, Spencer, Kleban, Matthew, and Levi, Thomas S., E-mail: spchang123@gmail.com, E-mail: mk161@nyu.edu, E-mail: tl34@nyu.edu. Watching worlds collide: effects on the CMB from cosmological bubble collisions. United States: N. p., 2009. Web. doi:10.1088/1475-7516/2009/04/025.
Chang, Spencer, Kleban, Matthew, & Levi, Thomas S., E-mail: spchang123@gmail.com, E-mail: mk161@nyu.edu, E-mail: tl34@nyu.edu. Watching worlds collide: effects on the CMB from cosmological bubble collisions. United States. https://doi.org/10.1088/1475-7516/2009/04/025
Chang, Spencer, Kleban, Matthew, and Levi, Thomas S., E-mail: spchang123@gmail.com, E-mail: mk161@nyu.edu, E-mail: tl34@nyu.edu. 2009. "Watching worlds collide: effects on the CMB from cosmological bubble collisions". United States. https://doi.org/10.1088/1475-7516/2009/04/025.
@article{osti_22156975,
title = {Watching worlds collide: effects on the CMB from cosmological bubble collisions},
author = {Chang, Spencer and Kleban, Matthew and Levi, Thomas S., E-mail: spchang123@gmail.com, E-mail: mk161@nyu.edu, E-mail: tl34@nyu.edu},
abstractNote = {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.},
doi = {10.1088/1475-7516/2009/04/025},
url = {https://www.osti.gov/biblio/22156975}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 04,
volume = 2009,
place = {United States},
year = {Wed Apr 15 00:00:00 EDT 2009},
month = {Wed Apr 15 00:00:00 EDT 2009}
}