Please use this identifier to cite or link to this item: http://hdl.handle.net/2307/225
Title: Primordial non-Gaussianities in the intergalactic medium
Authors: Viel, Matteo
Branchini, Enzo
Dolag, Klaus
Grossi, Margherita
Matarrese, Sabino
Moscardini, Lauro
Keywords: LY-ALPHA FOREST
QSO ABSORPTION-SPECTRA
LARGE-SCALE STRUCTURE
DIGITAL
SKY SURVEY
N-BODY SIMULATIONS
EQUATION-OF-STATE
POWER SPECTRUM
INITIAL CONDITIONS
FLUX DISTRIBUTION
HALO BIAS
Issue Date: 2009
Publisher: Wiley-Blackwell Publishing, Inc
Abstract: We present results from the first high-resolution hydrodynamical simulations of non-Gaussian cosmological models. We focus on the statistical properties of the transmitted Lyman-alpha flux in the high-redshift intergalactic medium. Imprints of non-Gaussianity are present and are larger at high redshifts. Differences larger than 20 per cent at z > 3 in the flux probability distribution function for high-transmissivity regions (voids) are expected for values of the non-linearity parameter f(NL) = +/- 100 when compared to a standard Lambda cold dark matter cosmology with f(NL) = 0. We also investigate the one-dimensional flux bispectrum: at the largest scales(corresponding to tens of Mpc), we expect deviations in the flux bispectrum up to 20 per cent at z similar to 4 (for f(NL) = +/- 100),significantly larger than deviations of similar to 3 per cent in the flux power spectrum. We briefly discuss possible systematic errors that can contaminate the signal. Although challenging, a detection of non-Gaussianities in the interesting regime of scales and redshifts probed by the Lyman-alpha forest could be possible with future data sets.
URI: http://hdl.handle.net/2307/225
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2008.14236.x
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

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