Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-03-16
Phys.Rev.D82:086006,2010
Physics
High Energy Physics
High Energy Physics - Theory
17 pages, 4 figures. v3: extended discussion of CMB anomalies; version accepted by Phys. Rev. D
Scientific paper
10.1103/PhysRevD.82.086006
In a landscape of compactifications with different numbers of macroscopic dimensions, it is possible that our universe has nucleated from a vacuum where some of our four large dimensions were compact while other, now compact, directions were macroscopic. From our perspective, this shapeshifting can be perceived as an anisotropic background spacetime. As an example, we present a model where our universe emerged from a tunneling event which involves the decompactification of two dimensions compactified on the two-sphere. In this case, our universe is of the Kantowski-Sachs type and therefore homogeneous and anisotropic. We study the deviations from statistical isotropy of the Cosmic Microwave Background induced by the anisotropic curvature, with particular attention to the anomalies. The model predicts a quadrupolar power asymmetry with the same sign and acoustic oscillations as found by WMAP. The amplitude of the effect is however too small given the current estimated bound on anisotropic curvature derived from the quadrupole.
Adamek Julian
Campo David
Niemeyer Jens C.
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