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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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