Mass functions from the excursion set model
نویسندگان
چکیده
منابع مشابه
The Halo Mass Function from the Excursion Set Method. Ii. the Diffusing Barrier
This paper is the second of a series of three where we study the mass function of virialized dark matter halos using the excursion set method. Motivated by recent large-scale N-body simulations determining the relation between the density threshold for gravitational collapse and the variance of the linear density field for regions that collapse to form halos by the present epoch, we deduce that...
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A sizeable level of non-Gaussianity in the primordial cosmological perturbations may be induced by a large trispectrum, i.e. by a large connected four-point correlation function. We compute the effect of a primordial non-Gaussian trispectrum on the halo mass function, within excursion set theory. We use the formalism that we have developed in a previous series of papers and which allows us to t...
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The high-mass tail of the dark matter halo mass function may be a sensitive probe of primordial nonGaussianities. In this paper, which is the third of a series of three, we perform a first-principle computation of the effect of primordial non-Gaussianity on the halo mass function using the excursion set method, where the evolution of the density perturbation with the smoothing scale is stochast...
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The article is a continuation of [1]. We define the following concepts: a function from a set X into a set Y , denoted by “Function of X ,Y ”, the set of all functions from a set X into a set Y , denoted by Funcs(X ,Y ), and the permutation of a set (mode Permutation of X , where X is a set). Theorems and schemes included in the article are reformulations of the theorems of [1] in the new termi...
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We discuss an analytic approach for modeling structure formation in sheets, filaments and knots. This is accomplished by combining models of triaxial collapse with the excursion set approach: sheets are defined as objects which have collapsed along only one axis, filaments have collapsed along two axes, and halos are objects in which triaxial collapse is complete. In the simplest version of thi...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2017
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201731467