TY  - JOUR
AU  - Sanchis-Lozano, M. A.
AU  - Melia, F.
AU  - Lopez-Corredoira, M.
AU  - Sanchis-Gual, N.
PY  - 2022
DA  - 2022//
TI  - Missing large-angle correlations versus even-odd point-parity imbalance in the cosmic microwave background
T2  - Astron. Astrophys.
JO  - Astronomy & Astrophysics
SP  - A121 - 10pp
VL  - 660
PB  - Edp Sciences S A
KW  - cosmological parameters
KW  - cosmic background radiation
KW  - cosmology: observations
KW  - cosmology: theory
KW  - inflation
KW  - large-scale structure of Universe
AB  - Context. The existence of a maximum correlation angle (theta(max) & 60 greater than or similar to degrees) in the two-point angular temperature correlations of cosmic microwave background (CMB) radiation, measured by WMAP and Planck, stands in sharp contrast to the prediction of standard inflationary cosmology, in which the correlations should extend across the full sky (i.e., 180 degrees). The introduction of a hard lower cuto ff (k(min)) in the primordial power spectrum, however, leads naturally to the existence of theta(max). Among other cosmological anomalies detected in these data, an apparent dominance of odd-over-even parity multipoles has been seen in the angular power spectrum of the CMB. This feature, however, may simply be due to observational contamination in certain regions of the sky. Aims. In attempting to provide a more detailed assessment of whether this odd-over-even asymmetry is intrinsic to the CMB, we therefore proceed in this paper, first, to examine whether this odd-even parity imbalance also manifests itself in the angular correlation function and, second, to examine in detail the interplay between the presence of theta(max) and this observed anomaly. Methods. We employed several parity statistics and recalculated the angular correlation function for di fferent values of the cuto ff kmin in order to optimize the fit to the di fferent Planck 2018 data. Results. We find a phenomenological connection between these features in the data, concluding that both must be considered together in order to optimize the theoretical fit to the Planck 2018 data. Conclusions. This outcome is independent of whether the parity imbalance is intrinsic to the CMB, but if it is, the odd-over-even asymmetry would clearly point to the emergence of new physics.
SN  - 0004-6361
UR  - https://arxiv.org/abs/2202.10987
UR  - https://doi.org/10.1051/0004-6361/202142296
DO  - 10.1051/0004-6361/202142296
LA  - English
N1  - WOS:000786712000002
ID  - Sanchis-Lozano_etal2022
ER  -