Asymmetries in the CMB anisotropy field

Abstract

We report on the results from two independent but complementary statistical analyses of the WMAP first-year data, based on the power spectrum and N-point correlation functions. We focus on large and intermediate scales (larger than about 3 degrees) and compare the observed data against Monte Carlo ensembles with WMAP-like properties. In both analyses, we measure the amplitudes of the large-scale fluctuations on opposing hemispheres and study the ratio of the two amplitudes. The power-spectrum analysis shows that this ratio for WMAP, as measured along the axis of maximum asymmetry, is high at the 95%-99% level (depending on the particular multipole range included). The axis of maximum asymmetry of the WMAP data is weakly dependent on the multipole range under consideration but tends to lie close to the ecliptic axis. In the N-point correlation function analysis we focus on the northern and southern hemispheres defined in ecliptic coordinates, and we find that the ratio of the large-scale fluctuation amplitudes is high at the 98%-99% level. Furthermore, the results are stable with respect to choice of Galactic cut and also with respect to frequency band. A similar asymmetry is found in the COBE-DMR map, and the axis of maximum asymmetry is close to the one found in the WMAP data.

arXiv comment6 pages, 5 figures; version to appear in ApJ, textual improvements, added references

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• Large-scale asymmetry between clockwise and counterclockwise galaxies revisited
• Do Cosmological Perturbations Have Zero Mean?
• Symmetry of the CMB sky as a new test of its statistical isotropy. Non Cosmological Octupole?
• Statistical Isotropy violation of the CMB brightness fluctuations
• Scale-dependent CMB power asymmetry from primordial speed of sound and a generalized $\delta$N formalism
• Effect of component separation on the temperature distribution of the CMB
• Primordial anisotropies from cosmic strings during inflation
• Reanalysis of the spin direction distribution of Galaxy Zoo SDSS spiral galaxies
• Using 3D and 2D analysis for analyzing large-scale asymmetry in galaxy spin directions
• Testing statistical Isotropy in Cosmic Microwave Background Polarization maps
• Testing the statistical isotropy of large scale structure with multipole vectors
• Maxwell's Multipole Vectors and the CMB
• Revisiting the large-scale CMB anomalies: The impact of the SZ signal from the Local Universe
• Detection of Dipole Modulation in CMB Temperature Anisotropy Maps from WMAP and Planck using Artificial Intelligence
• The CMB cold spot under the lens: ruling out a supervoid interpretation
• A study of Dipolar Signal in distant Quasars with various observables
• Analysis of $\sim 10^6$ spiral galaxies from four telescopes shows large-scale patterns of asymmetry in galaxy spin directions
• Effective Field Theory of Anisotropic Inflation and Beyond
• Isotropic non-Gaussian $g_{\mathrm{NL}}$-like toy models that reproduce the cosmic microwave background anomalies
• Multipole vectors of completely random microwave skies for $l\le 50$
• Testing the isotropy of the log N - log S slope for the NVSS radio catalogue
• Hemispherical Power Asymmetry of the Cosmic Microwave Background from a Remnant of a pre-Inflationary Topological Defect
• Influence of Planck foreground masks in the large angular scale quadrant CMB asymmetry
• Asymmetry of the CMB map: local and global anomalies
• Noncommutative Geometry and the Primordial Dipolar Imaginary Power Spectrum
• Temperature and Polarization Patterns in Anisotropic Cosmologies
• The Initial State of a Primordial Anisotropic Stage of Inflation
• Degree-scale anomalies in the CMB: localizing the first peak dip to a small patch of the north ecliptic sky
• Gaussianity of the CMB: Smooth Goodness of Fit Tests Applied to Interferometric Data
• Footprints of Doppler and Aberration Effects in CMB Experiments: Statistical and Cosmological Implications
• What have we learned from observational cosmology ?
• Reconstruction of CMB Temperature Anisotropies with Primordial CMB Induced Polarization in Galaxy Clusters
• Dynamical systems analysis of an interacting scalar field model in an anisotropic universe
• Cosmological Power Spectrum in Non-commutative Space-time
• Local properties of the large-scale peaks of the CMB temperature
• Testing for foreground residuals in the Planck foreground cleaned maps: A new method for designing confidence masks
• A Pixel Space Method for Testing Dipole Modulation in the CMB Polarization
• The primordial information content of Rayleigh Anisotropies
• Modelling the WMAP large-angle anomalies as an effect of a local density inhomogeneity
• Scalar quantities as detectors of non-Gaussianity on CMB maps
• Large-scale asymmetry in the distribution of galaxy spin directions -- analysis and reproduction
• Search for non-Gaussianities in the WMAP data with the Scaling Index Method
• Reconstruction of a direction-dependent primordial power spectrum from Planck CMB data
• Clifford algebra Cl(0,6) approach to beyond the standard model and naturalness problems
• A forecast for the detection of the power asymmetry from galaxy surveys
• Inhomogeneous and anisotropic Universe and apparent acceleration
• Complete noncommutativity in a cosmological model with radiation
• Hemispherical Variance Anomaly and Reionization Optical Depth
• Cosmological parameters from Planck data in SU(2)${}_{\mathrm{CMB}}$, their local $\Lambda$CDM values, and the modified photon Boltzmann equation
• Variograms of the Cosmic Microwave Background Temperature Fluctuations: Confirmation of Deviations from Statistical Isotropy
• Constraints on the SZ Power Spectrum on Degree Angular Scales in WMAP Data
• Large-scale asymmetry in galaxy spin directions -- analysis of galaxies with spectra in DES, SDSS, and DESI Legacy Survey
• Anomalies in the topology of the temperature fluctuations in the cosmic microwave background: An analysis of the $\text{NPIPE}$ and $\text{FFP10}$ data releases
• More about a successful vector-tensor theory of gravitation
• Estimation of Expected Euler Characteristic Curves of Nonstationary Smooth Gaussian Random Fields
• Anisotropic power spectrum and the observed low-l power in PLANCK CMB data
• Closing in on the large-scale CMB power asymmetry
• Estimating SI violation in CMB due to non-circular beam and complex scan in minutes
• A search for concentric rings with unusual variance in the 7-year WMAP temperature maps using a fast convolution approach
• The decoupling of scalar-modes from a linearly perturbed dust-filled Bianchi type I model
• Cosmic microwave background constraints on cosmological models with large-scale isotropy breaking
• Multiscale analysis of the CMB temperature derivatives
• Large-scale patterns of galaxy spin rotation show cosmological-scale parity violation and multipoles
• The kinetic Sunyaev-Zel'dovich effect from the diffuse gas in the Local Group
• Unraveling the CMB lack-of-correlation anomaly with the cosmological gravitational wave background
• The anomaly of the CMB power with the latest Planck data
• Unexplained correlation between the Cosmic Microwave Background temperature and the local matter density distribution
• Significant foreground unrelated non-acoustic anisotropy on the one degree scale in WMAP 5-year observations
• New evidence for lack of CMB power on large scales
• Dipolar fluence distribution of statistically isotropic FERMI gamma-ray bursts
• Non-gaussianity and Statistical Anisotropy in Cosmological Inflationary Models
• Test for anisotropy in the mean of the CMB temperature fluctuation in spherical harmonic space
• Level correlations of the CMB temperature angular power spectrum
• A Clifford Algebra Approach to Chiral Symmetry Breaking and Fermion Mass Hierarchies
• Phase Space Analysis for Anisotropic Universe with Nonlinear Bulk Viscosity
• The synchrotron foreground and CMB temperature-polarization cross correlation power spectrum from the first year WMAP data
• Cosmic Microwave Background Dipole Asymmetry could be explained by Axion Monodromy Cosmic Strings
• Adiabatic and Isocurvature Perturbation Projections in Multi-Field Inflation
• Matter Dipole and Hubble Tension due to Large Wavelength Perturbations
• Ellipsoidal Universe and Cosmic Shear
• The Cosmic Microwave Background anisotropies: open problems
• CMB Polarization by the Asymmetric Template of Scalar Perturbations
• A comprehensive study of Modulation effects on CMB Polarization
• Cosmic microwave background limits on spatially homogeneous cosmological models with dark energy
• Quadrant asymmetry in the angular distribution of the Cosmic Microwave Background in the Planck satellite data
• Detecting anomalies in CMB maps: a new method
• CMB-PAInT: An inpainting tool for the cosmic microwave background
• Testing cosmological models with large-scale power modulation using microwave background polarization observations
• The two-and three-point correlation functions of the polarized five-year WMAP sky maps
• Nearly Full-Sky Low-Multipole Cosmic Microwave Background Temperature Anisotropy: III. CMB Temperature Anomalies
• The quantum origin of cosmic structure: theory and observations
• CMB Anomalies from Imperfect Dark Energy: Confrontation with the Data
• SIToolBox : A package for Bayesian estimation of the isotropy violation in the CMB sky
• Analytical study of classic models of Hybrid Inflation
• Multipole alignment in the large-scale distribution of spin direction of spiral galaxies
• Cosmological correlation functions in scalar and vector inflationary models
• Constraining Axially Symmetric Bianchi Type I Model with Self-Consistent Recombination History and Observables
• Homology reveals significant anisotropy in the cosmic microwave background
• The frozen vanilla model: Exploring dark sector interactions with delta effective theories
• Evolution of cosmological event horizons in anisotropic universes
• Cosmic Microwave Background anisotropies: the power spectrum and beyond
• Cosmology with CMB anisotropy
• Hidden in the background: a local approach to CMB anomalies
• A Test for the Zero Mean Hypothesis in Cosmology
• Long-wavelength gravitational waves and cosmic acceleration
• 21-cm power spectrum and ionization bias as a probe of long-mode modulated non Gaussian sky
• Non-Gaussianities in the local curvature of the 5-year WMAP data
• Test of the Statistical Isotropy of the Universe using Gravitational Waves
• Stability Analysis of Four $f(Q)$ Gravity Models : A Cosmological Review in the Background of Bianchi-I Anisotropy
• The Primordial Magnetic Field (PMF) Generated in Large Field Inflation (LFI), Natural Inflation (NI) and $R^2$-Inflation by $f^{2}FF$ Model
• Weak Lensing Effect on CMB in the Presence of a Dipole Anisotropy
• Ring of attraction: overlapping directions of the dipole modulation of the CMB, the parity asymmetry, and kinematic dipole percolation zone
• Tachyonic Quintessence and a Preferred Direction in the Sky
• Deconstructing Functions on Quadratic Surfaces into Multipoles
• Confronting phantom inflation with Planck data
• `Standard' Cosmological model & beyond with CMB
• Testing cosmic homogeneity and isotropy using galaxy correlations
• Conformally flat travelling plane wave solutions of Einstein equations
• Lack of angular correlation and odd-parity preference in CMB data
• The Distortion of the Cosmic Microwave Background by the Milky Way
• Cosmological quests in the CMB sky
• Probing dipolar power asymmetry with galaxy clustering and intrinsic alignments
• Local bandpower diagnostics for the hemispherical power asymmetry in CMB E-mode polarization
• Testing the cosmological principle with quasars
• On the absence of a universal surface density, and a maximum Newtonian acceleration in dark matter haloes: consequences for MOND