par Rubtsov, Grigory;Ramazanov, Sabir 
Référence Physical review. D, Particles, fields, gravitation, and cosmology, 91, 4, 043514
Publication Publié, 2015-02
Référence Physical review. D, Particles, fields, gravitation, and cosmology, 91, 4, 043514
Publication Publié, 2015-02
Article révisé par les pairs
| Résumé : | We revisit constraints on the (pseudo)conformal universe from the nonobservation of statistical anisotropy in the Planck data. The quadratic maximal likelihood estimator is applied to the Planck temperature maps at frequencies 143 and 217 GHz as well as their cross-correlation. The strongest constraint is obtained in the scenario of the (pseudo)conformal universe with a long intermediate evolution after conformal symmetry breaking. In terms of the relevant parameter (coupling constant), the limit is h2<0.0013 at 95% C.L. (using the cross estimator). The analogous limit is much weaker in the scenario without the intermediate stage (h2lnH0Λ<0.52) allowing the coupling constant to be of order 1. In the latter case, the non-Gaussianity in the four-point function appears to be a more promising signature. |
