Improving constraints on primordial non-Gaussianity from Quaia with a new cosmological observable: angular redshift fluctuations
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2026
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866917219712106496 |
|---|---|
| author | Bermejo-Climent, José Ramón Hernández-Monteagudo, Carlos Crespo-Pérez, Alba Camalich, Jorge Martin Alonso, David Fabbian, Giulio Storey-Fisher, Kate |
| author_facet | Bermejo-Climent, José Ramón Hernández-Monteagudo, Carlos Crespo-Pérez, Alba Camalich, Jorge Martin Alonso, David Fabbian, Giulio Storey-Fisher, Kate |
| contents | Angular redshift fluctuations (ARF) are a new cosmological observable, recently proposed in the literature. It measures the 2D angular deviations of the average redshift of a given matter tracer under an input redshift shell. Since it depends on the galaxy bias, it can be used to constrain primordial non-Gaussianity through the scale-dependent bias effect. We analyze a sample of quasars built upon the Gaia satellite and unWISE data, Quaia, to measure the local non-Gaussianity parameter $f_{\rm NL}$. This sample is particularly suitable for measuring $f_{\rm NL}$ due to its large volume coverage. We measure the ARF power spectra from the Quaia catalog and combine their information with the 2D (projected) galaxy density and their cross-correlation with the $Planck$ PR4 CMB lensing maps lensing to jointly constrain $f_{\rm NL}$. Assuming the universality relation, we measure $f_{\rm NL} = -3 \pm 14$ at 68% confidence level by combining Quaia quasar angular density and ARF with the CMB lensing. This result is the second tightest constraint on $f_{\rm NL}$ using LSS two-point statistics to date and the best measurement achieved using two-point projected summary statistics, improving by $\sim$25% the previous measurement from Quaia. Our results motivate the inclusion of ARF as an additional cosmological observable in future 2D analysis of upcoming datasets from large surveys. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_16948 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Improving constraints on primordial non-Gaussianity from Quaia with a new cosmological observable: angular redshift fluctuations Bermejo-Climent, José Ramón Hernández-Monteagudo, Carlos Crespo-Pérez, Alba Camalich, Jorge Martin Alonso, David Fabbian, Giulio Storey-Fisher, Kate Cosmology and Nongalactic Astrophysics Angular redshift fluctuations (ARF) are a new cosmological observable, recently proposed in the literature. It measures the 2D angular deviations of the average redshift of a given matter tracer under an input redshift shell. Since it depends on the galaxy bias, it can be used to constrain primordial non-Gaussianity through the scale-dependent bias effect. We analyze a sample of quasars built upon the Gaia satellite and unWISE data, Quaia, to measure the local non-Gaussianity parameter $f_{\rm NL}$. This sample is particularly suitable for measuring $f_{\rm NL}$ due to its large volume coverage. We measure the ARF power spectra from the Quaia catalog and combine their information with the 2D (projected) galaxy density and their cross-correlation with the $Planck$ PR4 CMB lensing maps lensing to jointly constrain $f_{\rm NL}$. Assuming the universality relation, we measure $f_{\rm NL} = -3 \pm 14$ at 68% confidence level by combining Quaia quasar angular density and ARF with the CMB lensing. This result is the second tightest constraint on $f_{\rm NL}$ using LSS two-point statistics to date and the best measurement achieved using two-point projected summary statistics, improving by $\sim$25% the previous measurement from Quaia. Our results motivate the inclusion of ARF as an additional cosmological observable in future 2D analysis of upcoming datasets from large surveys. |
| title | Improving constraints on primordial non-Gaussianity from Quaia with a new cosmological observable: angular redshift fluctuations |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2601.16948 |