Detecting CMB modulations and non-Gaussianities from power multipoles

2014/01/08 by Lingfei Wang, Wang, Lingfei · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph.CO

paper · pdf · doi:10.48550/arxiv.1401.1584

15 pages, 4 figures

arxiv created 2014/01/08 · arxiv updated 2014/01/09

Abstract

By decomposing the CMB temperature fluctuations squared into spherical harmonics, we can define the CMB power multipoles as the fundamental observables to quantify any generic modulations in the CMB. This allows for simple direct measurements for the CMB modulations, and also indirect measurements for the CMB trispectrum, which fully determines the CMB modulations in a statistically isotropic universe. The CMB power multipoles can reach the theoretical accuracies higher than the current constraints from Planck observations. The theoretical accuracy for the dipole modulation, A∼0.0015, receives ∼ 10 times improvement; higher l modulations have even higher accuracies. This calls for practical observational studies of its possible improvements on the CMB modulation and non-Gaussianity constraints.

Citations

• Planck 2015 results

Cited by

• Spectator fields and their imprints on the Cosmic Microwave Background

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