The pesky power asymmetry

Liang Dai, Donghui Jeong, Marc Kamionkowski, Jens Chluba

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Abstract

Physical models for the hemispherical power asymmetry in the cosmic microwave background (CMB) reported by the Planck Collaboration must satisfy CMB constraints to the homogeneity of the Universe and quasar constraints to power asymmetries. We survey a variety of models for the power asymmetry and show that consistent models include a modulated scale-dependent isocurvature contribution to the matter power spectrum or a modulation of the reionization optical depth, gravitational-wave amplitude, or scalar spectral index. We propose further tests to distinguish between the different scenarios.

Original languageEnglish (US)
Article number123005
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume87
Issue number12
DOIs
Publication statusPublished - Jun 20 2013

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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