Validates redshift-space power spectrum and bispectrum analysis on Abacus-PNG mocks to recover unbiased f_NL constraints for Euclid spectroscopic sample.
Constraints on primordial non-Gaussianity from Quaia
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abstract
We analyse the large-scale angular clustering of quasars in the \gaia-\unwise quasar catalog, \quaia, and their cross-correlation with maps of the lensing convergence of the Cosmic Microwave Background (CMB), to constrain the level of primordial non-Gaussianity (PNG). Specifically, we target the scale-dependent bias that would be induced by PNG on biased tracers of the matter inhomogeneities on large scales. The \quaia sample is particularly well suited for this analysis, given the large effective volume covered, and our ability to map out the main potential sources of systematic contamination and mitigate their impact. Using the universality relation to characterise the response of the quasar overdensity to PNG ($p_\phi=1$), we report constraints on the local-type PNG parameter $f_{\rm NL}$ of $f_{\rm NL} =-20.5^{+19.0}_{-18.1}$ (68\% C.L.) by combining the quasar auto-correlation and its cross-correlation with CMB lensing in two tomographic redshift bins (or $f_{\rm NL} =-28.7^{+26.1}_{-24.6}$ if assuming a lower response for quasars, $p_\phi=1.6$). The error on $f_{\rm NL}$ can be further improved if the cross-correlation between the tomographic redshift bins is included. Using the CMB lensing cross-correlations alone, we find $f_{\rm NL} =-13.8^{+26.7}_{-25.0}$ and $f_{\rm NL} = -15.6^{+42.3}_{-34.8}$ for $p_\phi=1$ and $p_\phi=1.6$ respectively. These are the tightest constraints on $f_{\rm NL}$ to date from angular clustering statistics and cross-correlations with CMB lensing.
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Cross-correlation of DESI DR1 quasars with Planck PR4 CMB lensing constrains local f_NL to 2^{+28}_{-34} (p=1.6) or 6^{+20}_{-24} (p=1.0), tightening previous limits by 35%.
Dust-cleaned CIB and CMB lensing cross-correlations yield f_NL^local = 43 ± 23, tightening constraints on local primordial non-Gaussianity.
Using 708,483 quasars at 0.8<z<2.2 from Quaia, the authors identify 12,842 voids and 41,111 clusters whose radii, densities and profiles agree with 50 mock catalogues to within 5-10%, with no ultra-large structures exceeding mock expectations.
citing papers explorer
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Euclid preparation: Testing multi-field inflation with galaxy power spectrum and bispectrum
Validates redshift-space power spectrum and bispectrum analysis on Abacus-PNG mocks to recover unbiased f_NL constraints for Euclid spectroscopic sample.
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Constraining primordial non-Gaussianity from DESI DR1 quasars and Planck PR4 CMB Lensing
Cross-correlation of DESI DR1 quasars with Planck PR4 CMB lensing constrains local f_NL to 2^{+28}_{-34} (p=1.6) or 6^{+20}_{-24} (p=1.0), tightening previous limits by 35%.
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New constraints on primordial non-Gaussianity from large-scale cross-correlations of CMB lensing and the cosmic infrared background
Dust-cleaned CIB and CMB lensing cross-correlations yield f_NL^local = 43 ± 23, tightening constraints on local primordial non-Gaussianity.
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Tracing the high-z cosmic web with Quaia: catalogues of voids and clusters in the quasar distribution
Using 708,483 quasars at 0.8<z<2.2 from Quaia, the authors identify 12,842 voids and 41,111 clusters whose radii, densities and profiles agree with 50 mock catalogues to within 5-10%, with no ultra-large structures exceeding mock expectations.