Breaking the degeneracy between polarization efficiency and cosmological parameters in CMB experiments
| Autor: | Silvia Galli, Karim Benabed, T. M. Crawford, W. L. Kimmy Wu, François R. Bouchet, E. Hivon |
|---|---|
| Přispěvatelé: | Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Particle physics
data analysis method cosmological model Cosmology and Nongalactic Astrophysics (astro-ph.CO) satellite: Planck Cosmic microwave background Scalar (mathematics) FOS: Physical sciences cosmic background radiation: polarization Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Computer Science::Digital Libraries Spectral line power spectrum: primordial symbols.namesake power spectrum: scalar gravitation: lens statistical analysis 0103 physical sciences neutrino: mass Planck cosmic background radiation: power spectrum 010303 astronomy & astrophysics Physics polarization 010308 nuclear & particles physics Astrophysics::Instrumentation and Methods for Astrophysics Spectral density Polarization (waves) calibration Amplitude symbols Neutrino [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Physical Review D Physical Review D, American Physical Society, 2021, 104 (2), pp.023518. ⟨10.1103/PhysRevD.104.023518⟩ |
| ISSN: | 1550-7998 1550-2368 |
| DOI: | 10.1103/PhysRevD.104.023518⟩ |
| Popis: | Accurate cosmological parameter estimates using polarization data of the cosmic microwave background (CMB) put stringent requirements on map calibration, as highlighted in the recent results from the Planck satellite. In this paper, we point out that a model-dependent determination of polarization calibration can be achieved by the joint fit of the TE and EE CMB power spectra. This provides a valuable cross-check to band-averaged polarization efficiency measurements determined using other approaches. We demonstrate that, in $\Lambda$CDM, the combination of the TE and EE constrain polarization calibration with sub-percent uncertainty with Planck data and 2% uncertainty with SPTpol data. We arrive at similar conclusions when extending $\Lambda$CDM to include the amplitude of lensing $A_{\rm L}$, the number of relativistic species $N_{\rm eff}$, or the sum of the neutrino masses $\sum m_{\nu}$. The uncertainties on cosmological parameters are minimally impacted when marginalizing over polarization calibration, except, as can be expected, for the uncertainty on the amplitude of the primordial scalar power spectrum $\ln(10^{10} A_{\rm s})$, which increases by $20-50$%. However, this information can be fully recovered by adding TT data. For current and future ground-based experiments, SPT-3G and CMB-S4, we forecast the cosmological parameter uncertainties to be minimally degraded when marginalizing over polarization calibration parameters. In addition, CMB-S4 could constrain its polarization calibration at the level of $\sim$0.2% by combining TE and EE, and reach $\sim$0.06% by also including TT. We therefore conclude that relying on calibrating against Planck polarization maps, whose statistical uncertainty is limited to $\sim$0.5%, would be insufficient for upcoming experiments. Comment: 11 pages, 8 figures. Comments welcome |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|