Cosmological parameter forecasts by a joint 2D tomographic approach to CMB and galaxy clustering
| Autor: | Mario Ballardini, Jose Alberto Rubino-Martin, José Ramón Bermejo-Climent, Daniela Paoletti, Fabio Finelli, Roy Maartens, Luca Valenziano |
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| Přispěvatelé: | Bermejo-Climent J.R., Ballardini M., Finelli F., Paoletti D., Maartens R., Rubino-Martin J.A., Valenziano L. |
| Rok vydání: | 2021 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Physics and Astronomy (miscellaneous) Cosmic microwave background Cosmological parameters FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences NO Observatory 0103 physical sciences Source counts 010306 general physics Large scale structure of the Universe STFC Physics 010308 nuclear & particles physics PE9_14 Astrophysics::Instrumentation and Methods for Astrophysics Order (ring theory) Sigma RCUK Galaxy 13. Climate action Dark energy Cosmic microwave background Cosmological parameters Large scale structure of the Universe ST/N000668/1 Neutrino Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Bermejo-Climent, J R, Ballardini, M, Finelli, F, Paoletti, D, Maartens, R, Rubiño-Martín, J A & Valenziano, L 2021, ' Cosmological parameter forecasts by a joint 2D tomographic approach to CMB and galaxy clustering ', Physical Review D, vol. 103, no. 10, 103502 . https://doi.org/10.1103/PhysRevD.103.103502 |
| DOI: | 10.48550/arxiv.2106.05267 |
| Popis: | The cross-correlation between the cosmic microwave background (CMB) fields and matter tracers carries important cosmological information. In this paper, we forecast by a signal-to-noise ratio analysis the information contained in the cross-correlation of the CMB anisotropy fields with source counts for future cosmological observations and its impact on cosmological parameters uncertainties, using a joint tomographic analysis. We include temperature, polarization and lensing for the CMB fields and galaxy number counts for the matter tracers. By restricting ourselves to quasi-linear scales, we forecast by a Fisher matrix formalism the relative importance of the cross-correlation of source counts with the CMB in the constraints on the parameters for several cosmological models. We obtain that the CMB-number counts cross-correlation can improve the dark energy Figure of Merit (FoM) at most up to a factor $\sim 2$ for LiteBIRD+CMB-S4 $\times$ SKA1 compared to the uncorrelated combination of both probes and will enable the Euclid-like photometric survey to reach the highest FoM among those considered here. We also forecast how CMB-galaxy clustering cross-correlation could increase the FoM of the neutrino sector, also enabling a statistically significant ($\gtrsim$ 3$\sigma$ for LiteBIRD+CMB-S4 $\times$ SPHEREx) detection of the minimal neutrino mass allowed in a normal hierarchy by using quasi-linear scales only. Analogously, we find that the uncertainty in the local primordial non-Gaussianity could be as low as $\sigma (f_{\rm NL}) \sim 1.5-2$ by using two-point statistics only with the combination of CMB and radio surveys such as EMU and SKA1. Our results highlight the additional constraining power of the cross-correlation between CMB and galaxy clustering from future surveys which is mainly based on quasi-linear scales and therefore sufficiently robust to non-linear effects. Comment: 30 pages, 13 figures, 10 tables |
| Databáze: | OpenAIRE |
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