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The properties of the dark matter halo distribution in non-Gaussian scenarios
- Source :
-
Nuclear Physics B Proceedings Supplement . Oct2009, Vol. 194 Issue 1, p22-27. 6p. - Publication Year :
- 2009
-
Abstract
- The description of halo abundance and clustering for non-Gaussian initial conditions has recently received renewed interest, motivated by the forthcoming large galaxy and cluster surveys, which can potentially detect primordial non-Gaussianity of the local form with a non-Gaussianity parameter of order unity. This is particularly exciting because, while the simplest single-field slow-roll models of inflation predict a primordial , this signal sources extra contributions to the effective of large-scale structures that are expected to be above the predicted detection threshold [C. Carbone, L. Verde, and S. Matarrese, ApJL 684 (2008) L1]. We present tests on N-body simulations of analytical formulae describing the halo abundance and clustering for non-Gaussian initial conditions. In particular, when we calibrate the analytic non-Gaussian mass function of [S. Matarrese, L. Verde, L. and R. Jimenez, ApJL 541 (2000) 10] and [M. LoVerde, A. Miller, S. Shandera and L. Verde, JCAP 04 (2008) 014] and the analytic description of halo clustering for non-Gaussian initial conditions on N-body simulations, we find excellent agreement between the simulations and the analytic predictions if we make the substitutions and where , in the density threshold for gravitational collapse and in the non-Gaussian fractional correction to the halo bias, respectively. We discuss the implications of these corrections on present and forecasted primordial non-Gaussianity constraints. We confirm that the non-Gaussian halo bias offers a robust and highly competitive test of primordial non-Gaussianity. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09205632
- Volume :
- 194
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Nuclear Physics B Proceedings Supplement
- Publication Type :
- Periodical
- Accession number :
- 45001912
- Full Text :
- https://doi.org/10.1016/j.nuclphysbps.2009.07.038