A Hemispherical Power Asymmetry from Inflation

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dc.creatorErickcek, Adrienne L.
dc.creatorKamionkowski, Marc
dc.creatorCarroll, Sean M.
dc.date2008-06-03
dc.date2008-11-19
dc.date.accessioned2026-07-07T12:22:21Z
dc.date.available2026-07-07T12:22:21Z
dc.descriptionMeasurements of CMB temperature fluctuations by the Wilkinson Microwave Anisotropy Probe (WMAP) indicate that the fluctuation amplitude in one half of the sky differs from the amplitude in the other half. We show that such an asymmetry cannot be generated during single-field slow-roll inflation without violating constraints to the homogeneity of the Universe. In contrast, a multi-field inflationary theory, the curvaton model, can produce this power asymmetry without violating the homogeneity constraint. The mechanism requires the introduction of a large-amplitude superhorizon perturbation to the curvaton field, possibly a pre-inflationary remnant or a superhorizon curvaton-web structure. The model makes several predictions, including non-Gaussianity and modifications to the inflationary consistency relation, that will be tested with forthcoming CMB experiments.
dc.description5 pages, 2 figures; v3 reformatted with minor corrections made and refs. added; to appear in PRD
dc.identifierhttps://arxiv.org/abs/0806.0377
dc.identifierhttp://arxiv.org/abs/0806.0377
dc.identifierPhys.Rev.D78:123520,2008
dc.identifierdoi:10.1103/PhysRevD.78.123520
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/213625
dc.subjectAstrophysics
dc.titleA Hemispherical Power Asymmetry from Inflation
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