The evens and odds of CMB anomalies
| Autor: | Paolo Natoli, N. Mandolesi, Noriaki Kitazawa, Massimiliano Lattanzi, Augusto Sagnotti, Alessandro Gruppuso |
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| Přispěvatelé: | Gruppuso, A., Kitazawa, N., Lattanzi, Massimiliano, Mandolesi, N., Natoli, P., Sagnotti, A. |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
High Energy Physics - Theory
Cosmology and Nongalactic Astrophysics (astro-ph.CO) media_common.quotation_subject Cosmic microwave background FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics CMB Supergravity 01 natural sciences General Relativity and Quantum Cosmology NO Latitude symbols.namesake High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences Low-ℓ anomaly Planck Anisotropy String Theory 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics media_common Physics 010308 nuclear & particles physics Low-l anomaly CMB Low-l anomaly Inflation Supergravity String Theory Astronomy and Astrophysics Astronomy and Astrophysic Polarization (waves) Inflation Galaxy Settore FIS/02 - Fisica Teorica Modelli e Metodi Matematici High Energy Physics - Phenomenology High Energy Physics - Theory (hep-th) Sky Space and Planetary Science symbols Astrophysics - Cosmology and Nongalactic Astrophysics |
| Popis: | 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 $\Delta$ 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 \emph{even}--$\ell$ harmonic multipoles with $\ell \lesssim 20$, which appear sizably suppressed in a way that is robust with respect to Galactic masking, along with the corresponding detections of $\Delta$. On the other hand, the first \emph{odd}--$\ell$ multipoles are only suppressed at high Galactic latitudes. We investigate this behavior in different sky masks, constraining $\Delta$ through even and odd multipoles, and we elaborate on possible implications. We include low--$\ell$ polarization data which, despite being noise--limited, help in attaining confidence levels of about 3 $\sigma$ in the detection of $\Delta$. We also show by direct forecasts that a future all--sky $E$--mode cosmic--variance--limited polarization survey may push the constraining power for $\Delta$ beyond 5 $\sigma$. Comment: 49 pages, 19 figures. Figures and final discussion simplified, references added. Final version to appear in Physics of the Dark Universe |
| Databáze: | OpenAIRE |
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