ELLIPTICITY OF LARGE SPOTS IN CMB ANISOTROPY MAPS

2003/12/16 by V. G. Gurzadyan, P. A. R. Ade, P. de Bernardis +23
Physics and Astronomy · #Advanced Differential Geometry Research #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #astro-ph

paper · pdf · doi:10.1142/s0217732305016658

published as Mod.Phys.Lett. A20 (2005) 491-498 · Added: two co-authors and a comment on the possible relation of the discussed CMB properties with the origin of the observed value of the cosmological constant

arxiv created 2003/12/16 · openalex publication_date 2005/03/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We have measured the ellipticity of several degree scale anisotropies in the BOOMERanG maps of the Cosmic Microwave Background (CMB) at 150 GHz. The average ellipticity is around 2.6–2.7. The biases of the estimator of the ellipticity and for the noise are small in this case. Large spot elongation had been detected also for COBE-DMR and WMAP maps. If this effect is due to geodesic mixing, it would indicate a non-precisely zero curvature of the Universe which is among the discussed reasons of the WMAP low multipole anomaly.

Citations

• Multiple Peaks in the Angular Power Spectrum of the Cosmic Microwave Background: Significance and Consequences for Cosmology
• Hyperbolic universes with a horned topology and the cosmic microwave background anisotropy
• The BOOMERANG North America Instrument: A Balloon‐borne Bolometric Radiometer Optimized for Measurements of Cosmic Background Radiation Anisotropies from 0.3 to 4o
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results