Superhorizon Perturbations and the Cosmic Microwave Background

Details Superhorizon Perturbations and the Cosmic Microwave Background Superhorizon Perturbations and the Cosmic Microwave Background

2008-08-11

arxiv.org/abs/0808.1570v1

Phys.Rev.D78:083012,2008

Astronomy and Astrophysics

Astrophysics

11 pages, 4 figures, submitted to PRD

Scientific paper

10.1103/PhysRevD.78.083012

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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