The description of halo abundance and clustering for non-Gaussian initial conditions has recently received renewed interest, 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 vertical bar f(NL)vertical bar of order unity. This is particularly exciting because, while the simplest single-field slow-roll models of inflation predict a primordial vertical bar f(NL)vertical bar << 1, this signal sources extra contributions to the effective f(NL) of large-scale structures that are expected to be above the predicted detection threshold [1]. 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 [21 and [31 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 delta(c) -> delta(c) x root q and delta(c) -> delta(c) x q where q similar or equal to 0.75, 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..
The properties of the dark matter halo distribution in non-Gaussian scenarios / C. Carbone, E. Branchini, K. Dolag, M. Grossi, F. Iannuzzi, S. Matarrese, L. Moscardini, L. Verde. - In: NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS. - ISSN 0920-5632. - 194:C(2009 Oct), pp. 22-27. (Intervento presentato al convegno Galileo Galilei Institute Conference on Dark Matter and Dark Energy tenutosi a Firenze nel 2009) [10.1016/j.nuclphysbps.2009.07.038].
The properties of the dark matter halo distribution in non-Gaussian scenarios
C. Carbone
Primo
;
2009
Abstract
The description of halo abundance and clustering for non-Gaussian initial conditions has recently received renewed interest, 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 vertical bar f(NL)vertical bar of order unity. This is particularly exciting because, while the simplest single-field slow-roll models of inflation predict a primordial vertical bar f(NL)vertical bar << 1, this signal sources extra contributions to the effective f(NL) of large-scale structures that are expected to be above the predicted detection threshold [1]. 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 [21 and [31 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 delta(c) -> delta(c) x root q and delta(c) -> delta(c) x q where q similar or equal to 0.75, 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..File | Dimensione | Formato | |
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