Eur. Phys. J. Plus (2020) 135: 150
https://doi.org/10.1140/epjp/s13360-020-00166-5

Regular Article

Confronting the ellipsoidal universe to the Planck 2018 data

INFN - Sezione di Bari, Via Amendola 173, 70126, Bari, Italy

^* e-mail: paolo.cea@ba.infn.it

Received: 23 September 2019
Accepted: 11 November 2019
Published online: 28 January 2020

Abstract

We compared the Planck 2018 data on the large-scale anisotropies in the cosmic microwave background to the results obtained in the slightly anisotropic ellipsoidal universe. We focused on the quadrupole temperature correlations to better constrain the eccentricity at decoupling and the direction of the symmetry axis. We found that the quadrupole TE and EE temperature correlations in the ellipsoidal universe are still in reasonable agreement with the Planck 2018 data. We suggested that an experimental estimate of the average large-scale polarisation by the Planck Collaboration could confirm or reject the anisotropic universe proposal.