Impact of Uncertainties in the Cosmological Parameters on the Measurement of Primordial non-Gaussianity
arXiv:0808.3255 · doi:10.1103/PhysRevD.78.123004
Abstract
We study the impact of cosmological parameters' uncertainties on estimates of the primordial NG parameter f_NL in local and equilateral models of non-Gaussianity. We show that propagating these errors increases the f_NL relative uncertainty by 16% for WMAP and 5 % for Planck in the local case, whereas for equilateral configurations the correction term are 14% and 4%, respectively. If we assume for local f_NL a central value of order 60, according to recent WMAP 5-years estimates, we obtain for Planck a final correction Δf_NL = 3. Although not dramatic, this correction is at the level of the expected estimator uncertainty for Planck, and should then be taken into account when quoting the significance of an eventual future detection. In current estimates of f_NL the cosmological parameters are held fixed at their best-fit values. We finally note that the impact of uncertainties in the cosmological parameters on the final f_NL error bar would become totally negligible if the parameters were allowed to vary in the analysis and then marginalized over.
arXiv comment10 pages, 3 figures, submitted to Phys. Rev. D
References in corpus (34)
- Non-Gaussian features of primordial fluctuations in single field inflationary models
- Generating the curvature perturbation without an inflaton
- Non-Gaussianity from Inflation: Theory and Observations
- DBI in the Sky
- Acoustic Signatures in the Primary Microwave Background Bispectrum
- Adiabatic CMB perturbations in pre-big bang string cosmology
- Effects of Cosmological Moduli Fields on Cosmic Microwave Background
- Second-Order Cosmological Perturbations from Inflation
- Ghost Inflation
- A new mechanism for generating density perturbations from inflation
- The shape of non-Gaussianities
- Limits on non-Gaussianities from WMAP data
- Cosmic Complementarity: Joint Parameter Estimation from CMB Experiments and Redshift Surveys
- Measuring primordial non-Gaussianity in the cosmic microwave background
- Detection of primordial non-Gaussianity (fNL) in the WMAP 3-year data at above 99.5% confidence
- The bispectrum of galaxies from high-redshift galaxy surveys: primordial non-Gaussianity and non-linear galaxy bias
- Non-Gaussianities in New Ekpyrotic Cosmology
- Primordial Bispectrum Information from CMB Polarization
- CMB Anisotropies at Second Order I
- CMB Anisotropies at Second-Order II: Analytical Approach
- Gauge-Invariant Temperature Anisotropies and Primordial Non-Gaussianity
- Non-Gaussianities from ekpyrotic collapse with multiple fields
- Evolution of Second-Order Cosmological Perturbations and Non-Gaussianity
- The Full Second-Order Radiation Transfer Function for Large-Scale CMB Anisotropies
- Enhancement of Non-Gaussianity after Inflation
- Fast Estimator of Primordial Non-Gaussianity from Temperature and Polarization Anisotropies in the Cosmic Microwave Background II: Partial Sky Coverage and Inhomogeneous Noise
- Curvature Perturbations from Broken Symmetries
- Impact of Secondary non-Gaussianities on the Search for Primordial Non-Gaussianity with CMB Maps
- Cosmic microwave background bispectrum on small angular scales
- Non-Gaussianity from Broken Symmetries
- Non-Gaussianity of Large-Scale Cosmic Microwave Background Anisotropies beyond Perturbation Theory
- Point Source Contamination in CMB Non-Gaussianity Analyses
- The WMAP normalization of inflationary cosmologies
- CMB temperature anisotropies from third order gravitational perturbations
Cited by in corpus (20)
- Primordial non-Gaussianity and Bispectrum Measurements in the Cosmic Microwave Background and Large-Scale Structure
- Constraining Running Non-Gaussianity
- Constraining Primordial non-Gaussianity with Bispectrum and Power Spectum from Upcoming Optical and Radio Surveys
- Constraints on primordial non-Gaussianity from 800,000 photometric quasars
- A New Approach to Probing Primordial Non-Gaussianity
- Primordial Non-Gaussianity in the Cosmic Microwave Background
- Cosmological Parameters Degeneracies and Non-Gaussian Halo Bias
- Forecasts on Primordial non-Gaussianity from 21 cm Intensity Mapping experiments
- A non-Gaussian landscape
- Joint resonant CMB power spectrum and bispectrum estimation
- CMB constraint on non-Gaussianity in isocurvature perturbations
- On the non-Gaussianity from Recombination
- Baryon history and cosmic star formation in non-Gaussian cosmological models: numerical simulations
- The effects of primordial non-Gaussianity on the cosmological reionization
- Tensors, non-Gaussianities, and the future of potential reconstruction
- Constraining Scale-Dependent Non-Gaussianity with Future Large-Scale Structure and the CMB
- Probing primordial non-Gaussianity with the power spectrum and bispectrum of future 21cm intensity maps
- Non-Gaussian Shape Recognition
- Constraints on primordial non-Gaussianity from Galaxy-CMB lensing cross-correlation
- Isocurvature modes: joint analysis of the CMB power spectrum and bispectrum