Primordial non-Gaussianity with $\mu$-type and $y$-type spectral distortions: exploiting Cosmic Microwave Background polarization and dealing with secondary sources

Abstract

Cross-correlations between Cosmic Microwave Background (CMB) temperature and $y$-spectral distortions anisotropies have been previously proposed as a way to measure the local bispectrum parameter $f_{\mathrm{NL}}^{loc.}$ in a range of scales inaccessible to either CMB ($T$, $E$) bispectra or $T$-$\mu$ correlations. This is useful e.g. to test scale dependence of primordial non-Gaussianity. Unfortunately, the primordial $y$-T signal is strongly contaminated by the late-time correlation between the Integrated Sachs Wolfe and Sunyaev-Zel'dovich (SZ) effects. Moreover, SZ itself generates a large noise contribution in the $y$-parameter map. We consider two original ways to address these issues. In order to remove the bias due to the SZ-CMB temperature coupling, while also adding new signal, we include in the analysis the cross-correlation between $y$-distortions and CMB {\em polarization}. In order to reduce the noise, we propose to clean the $y$-map by subtracting a SZ template, reconstructed via cross-correlation with external tracers (CMB and galaxy-lensing signals). We combine this SZ template subtraction with the previously adopted solution of directly masking detected clusters. Our final forecasts show that, using $y$-distortions, a PRISM-like survey can achieve $1\sigma (f_{\mathrm{NL}}^{\text{loc.}})=300$, while an ideal experiment will achieve $1\sigma (f_{\mathrm{NL}}^{\text{loc.}})=130$, with improvements of a factor $\sim 3$ from adding the $y$-$E$ signal, and a further $20-30\%$ from template cleaning. These forecasts are much worse than current $f_{\mathrm{NL}}^{\text{loc.}}$ boundaries from {\em Planck}, but we stress again that they refer to completely different scales.

arXiv comment24 pages, 5 figures

References in corpus (36)

• Toward a halo mass function for precision cosmology: the limits of universality
• The Large Scale Bias of Dark Matter Halos: Numerical Calibration and Model Tests
• The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Tests of Gaussianity
• The Primordial Inflation Explorer (PIXIE): A Nulling Polarimeter for Cosmic Microwave Background Observations
• Planck 2015 results. XVII. Constraints on primordial non-Gaussianity
• The Sunyaev-Zel'dovich angular power spectrum as a probe of cosmological parameters
• The effect of primordial non-Gaussianity on halo bias
• On Non-Gaussianity in the Curvaton Scenario
• On the Cluster Physics of Sunyaev-Zel'dovich Surveys II: Deconstructing the Thermal SZ Power Spectrum
• Scale-dependent non-Gaussianity probes inflationary physics
• Detection of Thermal SZ -- CMB Lensing Cross-Correlation in Planck Nominal Mission Data
• Which spectral distortions does $\Lambda$CDM actually predict?
• A New Window on Primordial non-Gaussianity
• Scale-dependent bias of galaxies and mu-type distortion of the cosmic microwave background spectrum from single-field inflation with a modified initial state
• Detection of warm and diffuse baryons in large scale structure from the cross-correlation of gravitational lensing and the thermal Sunyaev-Zeldovich effect
• Prospects for Measuring Cosmic Microwave Background Spectral Distortions in the Presence of Foregrounds
• The integrated Sachs-Wolfe Effect -- Large Scale Structure Correlation
• Cosmology from the Thermal Sunyaev-Zel'dovich Power Spectrum: Primordial non-Gaussianity and Massive Neutrinos
• Constraining primordial magnetic fields with distortions of the black-body spectrum of the cosmic microwave background: pre- and post-decoupling contributions
• High-Resolution Simulations of Cosmic Microwave Background non-Gaussian Maps in Spherical Coordinates
• Probing the scale dependence of non-Gaussianity with spectral distortions of the cosmic microwave background
• Testing the Running of non-Gaussianity through the CMB mu-distortion and the Halo Bias
• First constraints on the running of non-Gaussianity
• Evolution of CMB spectral distortion anisotropies and tests of primordial non-Gaussianity
• Mapping the Integrated Sachs-Wolfe Effect
• The ISW-tSZ cross correlation: ISW extraction out of pure CMB data
• Impact of polarisation on the intrinsic CMB bispectrum
• Primordial trispectra and CMB spectral distortions
• Probing correlations of early magnetic fields using mu-distortion
• CMB distortion anisotropies due to the decay of primordial magnetic fields
• Cosmological constraints from $\mu E$ cross-correlations
• Measuring primordial anisotropic correlators with CMB spectral distortions
• Spectral distortions in the cosmic microwave background polarization
• Cross-correlation between thermal Sunyaev-Zeldovich effect and the integrated Sachs-Wolfe effect
• Anisotropic CMB distortions from non-Gaussian isocurvature perturbations

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• Induced superhorizon tensor perturbations from anisotropic non-Gaussianity
• Spectral distortion anisotropies from single-field inflation
• Non-Gaussianity constraints from Planck spectral distortion cross-correlations
• CMB constraints on running non-Gaussianity
• Spectral Distortion Anisotropy from Inflation for Primordial Black Holes
• Exploring compensated isocurvature perturbations with CMB spectral distortion anisotropies
• Primordial tensor bispectra in $\mu$-CMB cross-correlations
• New Horizons in Cosmology with Spectral Distortions of the Cosmic Microwave Background
• Leverage on small-scale primordial non-Gaussianity through cross-correlations between CMB $E$-mode and $\mu$-distortion anisotropies
• Spectral Distortion Signatures of Step-like Inflationary Potential
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