Superhorizon Perturbations and the Cosmic Microwave Background

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dc.creatorErickcek, Adrienne L.
dc.creatorCarroll, Sean M.
dc.creatorKamionkowski, Marc
dc.date2008-08-11
dc.date.accessioned2026-07-07T11:45:27Z
dc.date.available2026-07-07T11:45:27Z
dc.descriptionSuperhorizon perturbations induce large-scale temperature anisotropies in the cosmic microwave background (CMB) via the Grishchuk-Zel'dovich effect. We analyze the CMB temperature anisotropies generated by a single-mode adiabatic superhorizon perturbation. We show that an adiabatic superhorizon perturbation in a LCDM universe does not generate a CMB temperature dipole, and we derive constraints to the amplitude and wavelength of a superhorizon potential perturbation from measurements of the CMB quadrupole and octupole. We also consider constraints to a superhorizon fluctuation in the curvaton field, which was recently proposed as a source of the hemispherical power asymmetry in the CMB.
dc.description11 pages, 4 figures, submitted to PRD
dc.identifierhttps://arxiv.org/abs/0808.1570
dc.identifierhttp://arxiv.org/abs/0808.1570
dc.identifierPhys.Rev.D78:083012,2008
dc.identifierdoi:10.1103/PhysRevD.78.083012
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/201879
dc.subjectAstrophysics
dc.titleSuperhorizon Perturbations and the Cosmic Microwave Background
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