Effect of primordial non-Gaussianity on halo bias and mass function.

Desjacques, Vincent, Seljak, Uroš and Iliev, Ilian T. (2010) Effect of primordial non-Gaussianity on halo bias and mass function. In: INVISIBLE UNIVERSE, Paris, France. 29 June - 10 July 2009.

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Abstract

We discuss the effect of quadratic and cubic local non-Gaussianity on the mass function and bias of dark matter halos extracted from cosmological N-body simulations. This type of non-Gaussianity induces a k-dependent bias in the large-scale clustering of rare objects. While we find that at low wavenumbers k<0.03 hMpc-1 the theory and the simulations agree well with each other for biased halos with b(M)>1.5, including a scale independent correction to the non-Gaussian bias improves the agreement on small scales where the k-dependent effect becomes rapidly negligible. Using available large-scale structure data, we obtain a limit on the size of the cubic nonlinear parameter of -3.5×105< gNL<8.2×105. Future observations shall improve this bound by 1¿2 orders of magnitude

Item Type: Conference or Workshop Item (Paper)
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Ilian Iliev
Date Deposited: 06 Feb 2012 18:27
Last Modified: 20 Mar 2012 17:05
URI: http://sro.sussex.ac.uk/id/eprint/16451
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