Constraining primordial non-Gaussianity with future galaxy surveys

By Tommaso Giannantonio, C. Porciani, J. Carron, Adam Amara, A. Pillepich. 2011

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We study the constraining power on primordial non-Gaussianity of future surveys of the large-scale structure of the Universe for both near-term surveys (such as the Dark Energy Survey – DES) as well as longer term projects such as Euclid and WFIRST. Specifically we perform a Fisher matrix analysis forecast for such surveys, using DES-like and Euclid-like configurations as examples, and take account of any expected photometric and spectroscopic data. We focus on two-point statistics and consider three observables: the 3D galaxy power spectrum in redshift space, the angular galaxy power spectrum and the projected weak-lensing shear power spectrum. We study the effects of adding a few extra parameters to the basic Λ cold dark matter (ΛCDM) set. We include the two standard parameters to model the current value for the dark-energy equation of state and its time derivative, w0, wa, and we account for the possibility of primordial non-Gaussianity of the local, equilateral and orthogonal types, of parameter fNL and, optionally, of spectral index . We present forecasted constraints on these parameters using the different observational probes. We show that accounting for models that include primordial non-Gaussianity does not degrade the constraint on the standard ΛCDM set nor on the dark-energy equation of state. By combining the weak-lensing data and the information on projected galaxy clustering, consistently including all two-point functions and their covariance, we find forecasted marginalized errors σ(fNL) ∼ 3, from a Euclid-like survey for the local shape of primordial non-Gaussianity, while the orthogonal and equilateral constraints are weakened for the galaxy clustering case, due to the weaker scale dependence of the bias. In the lensing case, the constraints remain instead similar in all configurations.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/b890616b0df2452d5438f151b76183b8e7c90f73

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Citations in the corpus

KiDS+GAMA : cosmology constraints from a joint analysis of cosmic shear, galaxy-galaxy lensing, and angular clustering (2017, background): “Limber’s approximation is more accurate the more extended along the line of sight the kernel of the signal under consideration is (see e.g. Giannantonio et al. 2012).”
Neutrino Physics from the Cosmic Microwave Background and Large-Scale Structure (2013, background): “ructure produce a quadratic divergence in power at large scales that is proportional to flocal NL [85]. This has been used several times to place independent constraints on non-Gaussianity (see e.g., [86, 87, 88, 89, 90] and references therein). However, even the most competitive Community Planning ”
Testing Inflation with Large Scale Structure: Connecting Hopes with Reality (2014, background): “um Forecasts Forecasts for the constraining power of the galaxy bispectrum on primordial non-Gaussianity are few, and they typically lack the detailed modeling found in power spectrum forecasts (e.g. [126]). Based on idealized survey geometry assumptions and ignoring the redshift evolution, [118] es”
Probing primordial non-Gaussianity with SKA galaxy redshift surveys: a fully relativistic analysis (2014, background): “However, it is known that the inclusion of PNG does not significantly broaden other parameter confidence intervals (Giannantonio et al. 2012).”
Inflation and String Theory (2014, background): “However, optimistic estimates of galaxy lensing tomography suggest that this may not be completely out of reach for future LSS observations [176].”
Cosmology and Fundamental Physics with the Euclid Satellite (2012, methodology): “Table 24: Forecast 1σ errors for a scale-dependent local model of primordial non-Gaussianity [521].”
Planck 2018 results. IX. Constraints on primordial non-Gaussianity (2019, methodology): “Forecasts of what would be feasible with future data were performed by for instance LoVerde et al. (2008), Sefusatti et al. (2009), Becker et al. (2011), Giannantonio et al. (2012), and Becker et al. (2012).”
CFHTLenS: combined probe cosmological model comparison using 2D weak gravitational lensing (2012, background): “Compared to the statistical errors of current probes, these correlations can safely be ignored at present, but have to be taken into account for future surveys (Giannantonio et al. 2012).”
The clustering of galaxies in the SDSS-III DR9 Baryon Oscillation Spectroscopic Survey: constraints on primordial non-Gaussianity (2012, methodology): “Giannantonio et al. (2012) predict that combining CMB data from the Planck mission (The Planck Collaboration 2006) and galaxy data from a Euclid-like (Laureijs et al. 2011) survey will reduce the 1σ uncertainty on f localNL to 3.”