Observable effects of anisotropic bubble nucleation

Our universe may have formed via bubble nucleation in an eternally-inflating background. Furthermore, the background may have a compact dimension -- the modulus of which tunnels out of a metastable minimum during bubble nucleation -- which subsequently grows to become one of our three large spatial...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2010-07, Vol.2010 (7), p.007-7
Main Authors: Blanco-Pillado, Jose J, Salem, Michael P
Format: Article
Language:English
Subjects:
AMPLITUDES
ANISOTROPY
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BUBBLES
CORRELATIONS
DETECTION
INFLATIONARY UNIVERSE
NUCLEATION
PHOTONS
SPHERICAL HARMONICS
SYMMETRY
UNIVERSE
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Summary:Our universe may have formed via bubble nucleation in an eternally-inflating background. Furthermore, the background may have a compact dimension -- the modulus of which tunnels out of a metastable minimum during bubble nucleation -- which subsequently grows to become one of our three large spatial dimensions. Then the reduced symmetry of the background is equivalent to anisotropic initial conditions in our bubble universe. We compute the inflationary spectrum in such a scenario and, as a first step toward understanding the effects of anisotropy, project it onto spherical harmonics. The resulting spectrum exhibits anomalous multipole correlations, their relative amplitude set by the present curvature parameter, which appear to extend to arbitrarily large multipole moments. This raises the possibility of future detection, if slow-roll inflation does not last too long within our bubble. A full understanding of the observational signal must account for the effects of background anisotropy on photon free streaming, and is left to future work. Keywords->
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2010/07/007