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.
Ellipticity of large spots in CMB anisotropy maps / Gurzadyan, Vahagn; P. A. R., Ade; DE BERNARDIS, Paolo; Bianco, Carlo Luciano; J. J., Bock; A., Boscaleri; B. P., Crill; DE TROIA, Grazia; E., Hivon; V. V., Hristov; A. L., Kashin; A. E., Lange; Masi, Silvia; P. D., Mauskopf; T., Montroy; P., Natoli; C. B., Netterfield; Pascale, Enzo; Piacentini, Francesco; Polenta, Gianluca; J., Ruhl; G., Yegorian. - In: MODERN PHYSICS LETTERS A. - ISSN 0217-7323. - 20:7(2005), pp. 491-498. [10.1142/s0217732305016658]
Ellipticity of large spots in CMB anisotropy maps
GURZADYAN, VAHAGN;DE BERNARDIS, Paolo;BIANCO, Carlo Luciano;DE TROIA, Grazia;MASI, Silvia;PASCALE, ENZO;PIACENTINI, Francesco;POLENTA, GIANLUCA;
2005
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
