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Superhorizon Perturbations and the Cosmic Microwave Background

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arxiv 0808.1570 v1 pith:CMN4SMEN submitted 2008-08-11 astro-ph

Adrienne L. Erickcek , Sean M. Carroll , Marc Kamionkowski (Caltech) This is my paper · ORCID
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keywords superhorizonperturbationtemperatureadiabaticanisotropiesbackgroundconstraintscosmic
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Superhorizon 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.

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Cited by 2 Pith papers

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