The Pesky Power Asymmetry
Cosmology and Nongalactic Astrophysics
2013-06-26 v1
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.
Keywords
Cite
@article{arxiv.1303.6949,
title = {The Pesky Power Asymmetry},
author = {Liang Dai and Donghui Jeong and Marc Kamionkowski and Jens Chluba},
journal= {arXiv preprint arXiv:1303.6949},
year = {2013}
}
Comments
5 pages, 4 figures