Cosmic Microwave Background Quadrupole and Ellipsoidal Universe

Abstract

Recent Wilkinson Microwave Anisotropy Probe (WMAP) data confirm the Cosmic Microwave Background (CMB) quadrupole anomaly. We further elaborate our previous proposal that the quadrupole power can be naturally suppressed in axis-symmetric universes. In particular, we discuss in greater detail the CMB quadrupole anisotropy and considerably improve our analysis. As a result, we obtain tighter constraints on the direction of the axis of symmetry as well as on the eccentricity at decoupling. We find that the quadrupole amplitude can be brought in accordance with observations with an eccentricity at decoupling of about 0.35 10^{-2}. Moreover, our determination of the direction of the symmetry axis is in reasonable agreement with recent statistical analyses of cleaned CMB temperature fluctuation maps obtained by means of improved internal linear combination methods as Galactic foreground subtraction technique.

19 pages, 1 figure, 4 tables. Minor changes, reference added. Accepted for publication in Phys. Rev. D

References in corpus (8)

• Bianchi Model CMB Polarization and its Implications for CMB Anomalies
• Correlating anomalies of the microwave sky: The Good, the Evil and the Axis
• Cosmology with moving dark energy and the CMB quadrupole
• Possible extensions of the standard cosmological model: anisotropy, rotation, and magnetic field
• Does the Universe Have a Handedness?
• Ellipsoidal universe in the brane world
• Is the Cosmic "Axis of Evil" due to a Large-Scale Magnetic Field
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• Inflation-Produced Magnetic Fields in R^n F^2 and I F^2 models
• Testing Isotropy of Cosmic Microwave Background Radiation