Can large-scale structure probe CMB-constrained non-Gaussianity?
| dc.creator | Kang, X. | |
| dc.creator | Norberg, P. | |
| dc.creator | Silk, J. | |
| dc.date | 2007-01-05 | |
| dc.date.accessioned | 2026-07-07T10:21:23Z | |
| dc.date.available | 2026-07-07T10:21:23Z | |
| dc.description | The first year Wilkinson Microwave Anisotropy Probe (WMAP) set quantitative constraints on the amplitude of any primordial non-Gaussianity. We run a series of dark matter-only N-body simulations with the WMAP constraints to investigate the effect of the presence of primordial non-Gaussianity on large scale structures. The model parameters can be constrained using the observations of protoclusters associated with Ly-$α$ emitters at high redshift ($2 \leq z \leq 4$), assuming the galaxy velocity bias can be modelled properly. High redshift structure formation potentially provides a more powerful test of possible primordial non-Gaussianity than does the CMB, albeit on smaller scales. Another constraint is given by the local galaxy density probability distribution function (PDF), as mapped by the 2 degree Field Galaxy Redshift Survey (2dFGRS). The PDF of 2dFGRS \lstar galaxies is substantially higher than the standard model predictions and requires either a non-negligible bias between galaxy and dark matter on $\sim 12$~\hmpc scales or a stronger non-Gaussianity than allowed by the WMAP year one data. The latter interpretation is preferred since second-order bias corrections are negative. With a lower normalisation of the power spectrum fluctuations, sigma_8=0.74, as favoured by the WMAP 3 year data, the discrepancy between the Gaussian model and the data is even larger. | |
| dc.description | 5 Pages, 5 Figures; accepted for publication in MNRAS | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0701131 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0701131 | |
| dc.identifier | Mon.Not.Roy.Astron.Soc.376:343-347,2007 | |
| dc.identifier | doi:10.1111/j.1365-2966.2007.11435.x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/175158 | |
| dc.subject | Astrophysics | |
| dc.title | Can large-scale structure probe CMB-constrained non-Gaussianity? | |
| dc.type | text |