Please use this identifier to cite or link to this item:
|Title:||Primordial non-Gaussianities in the intergalactic medium||Authors:||Viel, Matteo
|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'
Show full item record Recommend this item
Files in This Item:
|File||Description||Size||Format||Existing users please Login|
|lya.pdf||6.7 MB||Adobe PDF||Request a copy|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.