2017/12/08 by A. Gruppuso, Gruppuso, A., N. Kitazawa +9 · 2 citations
Decision Sciences · Physics and Astronomy · Social Sciences · #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Insurance, Mortality, Demography, Risk Management #Leadership, Behavior, and Decision-Making Studies
paper · pdf · doi:10.48550/arxiv.1712.03288
openalex publication_date 2017/12/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The lack of power of large--angle CMB anisotropies is known to increase its statistical significance at higher Galactic latitudes, where a string--inspired pre--inflationary scale Δ can also be detected. Considering the Planck 2015 data, and relying largely on a Bayesian approach, we show that the effect is mostly driven by the even--ℓ harmonic multipoles with ℓ \lesssim 20, which appear sizably suppressed in a way that is robust with respect to Galactic masking, along with the corresponding detections of Δ. On the other hand, the first odd--ℓ multipoles are only suppressed at high Galactic latitudes. We investigate this behavior in different sky masks, constraining Δ through even and odd multipoles, and we elaborate on possible implications. We include low--ℓ polarization data which, despite being noise--limited, help in attaining confidence levels of about 3 σ in the detection of Δ. We also show by direct forecasts that a future all--sky E--mode cosmic--variance--limited polarization survey may push the constraining power for Δ beyond 5 σ.