Disentangling Doppler modulation, aberration and the temperature dipole in the CMB

Abstract

An observer in relative motion to the Cosmic Microwave Background (CMB) rest frame is sensitive to both aberration and Doppler effects. Both effects introduce similar but non-identical off-diagonal couplings in the spherical harmonic coefficients. The CMB temperature dipole may have additional contributions from an intrinsic component, which in turn produces different aberration and Doppler couplings. Moreover, the standard conversion from intensity measurements into temperature also introduces spurious Doppler-like couplings. In order to learn about the intrinsic dipole it is therefore important to measure both aberration and Doppler couplings in an independent manner while also removing the spurious contributions from unit conversion, which are degenerate with the dipole. Here we present a pipeline to measure the Doppler and aberration signal independently from each other and from the dipole itself. We also consider realistic beaming, noise and mask effects. Our pipeline results in independent and unbiased estimators which have uncertainties only ~20% larger than the simple theoretical expectations. We discuss the achievable precision in each measurement for Planck 2018, and also forecast them for future ground-based experiments with the Simons Observatory and CMB-S4. An alternative pipeline is presented in order to cross-check results and improve robustness.

arXiv commentAccepted for publication in PRD. 16 pages, 9 figures

References in corpus (34)

• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Planck 2018 results. I. Overview and the cosmological legacy of Planck
• The Simons Observatory: Science goals and forecasts
• The Temperature of the Cosmic Microwave Background
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Sky Maps, Systematic Errors, and Basic Results
• MASTER of the CMB Anisotropy Power Spectrum: A Fast Method for Statistical Analysis of Large and Complex CMB Data Sets
• Planck 2018 results. IV. Diffuse component separation
• Planck 2013 results. XXVII. Doppler boosting of the CMB: Eppur si muove
• Estimators for CMB Statistical Anisotropy
• Peculiar velocity effects in high-resolution microwave background experiments
• Distinguishing Between Void Models and Dark Energy with Cosmic Parallax and Redshift Drift
• Superposition of blackbodies and the dipole anisotropy: A possibility to calibrate CMB experiments
• Aspects of the Cosmic Microwave Background Dipole
• The Signature of Proper Motion in the Microwave Sky
• Bulk flows and CMB dipole anisotropy in cosmological void models
• On the significance of power asymmetries in Planck CMB data at all scales
• Measuring our peculiar velocity on the CMB with high-multipole off-diagonal correlations
• Aberrating the CMB sky: fast and accurate computation of the aberration kernel
• On the proper kinetic quadrupole CMB removal and the quadrupole anomalies
• Measuring our Peculiar Velocity by "Pre-deboosting" the CMB
• Planck intermediate results. LVI. Detection of the CMB dipole through modulation of the thermal Sunyaev-Zeldovich effect: Eppur si muove II
• Bayesian estimation of our local motion from the Planck-2018 CMB temperature map
• Statistical Isotropy violation of CMB polarization sky due to Lorentz boost
• Exploring cosmic origins with CORE: effects of observer peculiar motion
• Interpreting the CMB aberration and Doppler measurements: boost or intrinsic dipole?
• Beyond the Boost: Measuring the intrinsic dipole of the CMB using the spectral distortions of the monopole and quadrupole
• Cosmic Microwave Background Dipole induced by double inflation
• CMB Aberration and Doppler Effects as a Source of Hemispherical Asymmetries
• Cosmological parameter estimation: impact of CMB aberration
• CMB all-scale blackbody distortions induced by linearizing temperature
• CMB all-scale blackbody distortions induced by linearizing temperature
• Footprints of Doppler and Aberration Effects in CMB Experiments: Statistical and Cosmological Implications
• Non-Gaussianity and CMB aberration and Doppler
• Determining our peculiar velocity from the aberration in the cosmic microwave background

Cited by in corpus (9)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Is the Observable Universe Consistent with the Cosmological Principle?
• Testing cosmic anisotropy with Pade approximation and Pantheon+ sample
• Tomographic redshift dipole: Testing the cosmological principle
• The CMB cold spot under the lens: ruling out a supervoid interpretation
• Measuring our peculiar velocity from spectroscopic redshift surveys
• Effects of boosting on extragalactic components: methods and statistical studies
• Galaxy number-count dipole and superhorizon fluctuations
• First constraints on the intrinsic CMB dipole and our velocity with Doppler and aberration