Cosmic Microwave Background Quadrupole and Ellipsoidal Universe

By L. Campanelli, P. Cea, L. Tedesco. 2007

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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 0.64x10{sup -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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/5b00846e291450738e70f98cd2b377661f54592b

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Cosmology and Fundamental Physics with the Euclid Satellite (2012, background): “Several explanations for this anomaly have been proposed (see, e.g., Tsujikawa et al. 2003; Cline et al. 2003; DeDeo et al. 2003; Campanelli et al. 2007; Gruppuso 2007) including the fact that the universe is expanding with different velocities along different directions.”