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Recent analytical work on the modelling of dark halo abundances and clustering has demonstrated the advantages of combining the excursion set approach with peaks theory. We extend these ideas and introduce a model of excursion set peaks…

Cosmology and Nongalactic Astrophysics · Physics 2016-11-14 Emanuele Castorina , Aseem Paranjape , Oliver Hahn , Ravi K. Sheth

The initial shear field plays a central role in the formation of large-scale structures, and in shaping the geometry, morphology, and topology of the cosmic web. We discuss a recent theoretical framework for the shear tensor, termed the…

Cosmology and Nongalactic Astrophysics · Physics 2014-11-06 Graziano Rossi

The initial shear field, characterized by a primordial perturbation potential, plays a crucial role in the formation of large scale structures. Hence, considerable analytic work has been based on the joint distribution of its eigenvalues,…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-03 Graziano Rossi

The excursion set theory, where density perturbations evolve stochastically with the smoothing scale, provides a method for computing the dark matter halo mass function. The computation of the mass function is mapped into the so-called…

Cosmology and Nongalactic Astrophysics · Physics 2012-01-05 Andrea De Simone , Michele Maggiore , Antonio Riotto

We describe a simple fully analytic model of the excursion set approach associated with two Gaussian random walks: the first walk represents the initial overdensity around a protohalo, and the second is a crude way of allowing for other…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-12 Emanuele Castorina , Ravi K. Sheth

The simplest stochastic halo formation models assume that the traceless part of the shear field acts to increase the initial overdensity (or decrease the underdensity) that a protohalo (or protovoid) must have if it is to form by the…

Cosmology and Nongalactic Astrophysics · Physics 2014-07-09 Marcello Musso , Ravi K. Sheth

We present a new method to compute the first crossing distribution in excursion set theory for the case of correlated random walks. We use a combination of the path integral formalism of Maggiore & Riotto, and the integral equation solution…

Cosmology and Nongalactic Astrophysics · Physics 2014-02-18 Arya Farahi , Andrew J. Benson

The excursion set approach provides a framework for predicting how the abundance of dark matter halos depends on the initial conditions. A key ingredient of this formalism comes from the physics of halo formation: the specification of a…

Cosmology and Nongalactic Astrophysics · Physics 2014-11-12 I. Achitouv , Y. Rasera , R. K. Sheth , P. S. Corasaniti

We present a new method to extract cosmological constraints from weak lensing (WL) peak counts, which we denote as `the hierarchical algorithm'. The idea of this method is to combine information from WL maps sequentially smoothed with a…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-30 Laura Marian , Robert E. Smith , Stefan Hilbert , Peter Schneider

The excursion set approach is a framework for estimating how the number density of nonlinear structures in the cosmic web depends on the expansion history of the universe and the nature of gravity. A key part of the approach is the…

Cosmology and Nongalactic Astrophysics · Physics 2018-12-31 Farnik Nikakhtar , Mohammadreza Ayromlou , Shant Baghram , Sohrab Rahvar , M. Reza Rahimi Tabar , Ravi K. Sheth

We use the Excursion Set formalism to compute the properties of the halo mass distribution for a stochastic barrier model which encapsulates the main features of the ellipsoidal collapse of dark matter halos. Non-markovian corrections due…

Cosmology and Nongalactic Astrophysics · Physics 2011-07-29 P. S. Corasaniti , I. Achitouv

The excursion set theory based on spherical or ellipsoidal gravitational collapse provides an elegant analytic framework for calculating the mass function and the large-scale bias of dark matter haloes. This theory assumes that the…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Chung-Pei Ma , Michele Maggiore , Antonio Riotto , Jun Zhang

Excursion set theory, where density perturbations evolve stochastically with the smoothing scale, provides a method for computing the mass function of cosmological structures like dark matter halos, sheets and filaments. The computation of…

Cosmology and Nongalactic Astrophysics · Physics 2011-07-28 Andrea De Simone , Michele Maggiore , Antonio Riotto

We derive approximated, yet very accurate analytical expressions for the abundance and clustering properties of dark matter halos in the excursion set peak framework; the latter relies on the standard excursion set approach, but also…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-22 A. Lapi , L. Danese

The Press--Schechter, excursion set approach allows one to make predictions about the shape and evolution of the mass function of bound objects. It combines the assumption that objects collapse spherically with the assumption that the…

Astrophysics · Physics 2008-11-26 Ravi K. Sheth , H. J. Mo , Giuseppe Tormen

The Press-Schechter (PS) and excursion set (ES) models of structure formation fail in reproducing the halo bias found in simulations, while the excursion set-peaks (ESP) formalism built in the peak model reproduces it only at high masses…

Cosmology and Nongalactic Astrophysics · Physics 2024-10-07 Eduard Salvador-Solé , Alberto Manrique

Constrained realisations of Gaussian random fields are used in cosmology to design special initial conditions for numerical simulations. We review this approach and its application to density peaks providing several worked-out examples. We…

Cosmology and Nongalactic Astrophysics · Physics 2016-09-06 Cristiano Porciani

Improving and optimizing oceanographic sampling is a crucial task for marine science and maritime resource management. Faced with limited resources in understanding processes in the water-column, the combination of statistics and autonomous…

Applications · Statistics 2020-08-19 Trygve Olav Fossum , Cédric Travelletti , Jo Eidsvik , David Ginsbourger , Kanna Rajan

We develop a geometric formulation of peak statistics in cosmological density fields based on optimal transport and entropy. In this framework, the density field is treated as a probability measure, and its local structure is characterized…

Cosmology and Nongalactic Astrophysics · Physics 2026-04-02 Tsutomu T. Takeuchi

A classic method for computing the mass function of dark matter halos is provided by excursion set theory, where density perturbations evolve stochastically with the smoothing scale, and the problem of computing the probability of halo…

Cosmology and Nongalactic Astrophysics · Physics 2011-02-11 Michele Maggiore , Antonio Riotto
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