269 citations · 2.2k across the 103 of their papers we have counts for
57 papers · 1 filter
Persistent fluctuations in the distribution of galaxies from the Two degree Field Galaxy Redshift Survey
Francesco Sylos Labini, Nikolay L. Vasilyev, Yurij V. Baryshev
We apply the scale-length method to several three dimensional samples of the Two degree Field Galaxy Redshift Survey. This method allows us to map in a quantitative and powerful wa…
Energy ejection in the collapse of a cold spherical self-gravitating cloud
M. Joyce, B. Marcos, F. Sylos Labini
When an open system of classical point particles interacting by Newtonian gravity collapses and relaxes violently, an arbitrary amount of energy may in principle be carried away by…
Gravitational clustering: an overview
Francesco Sylos Labini
We discuss the differences and analogies of gravitational clustering in finite and infinite systems. The process of collective, or violent, relaxation leading to the formation of q…
Absence of self-averaging and of homogeneity in the large scale galaxy distribution
Francesco Sylos Labini, Nikolay L. Vasilyev, Luciano Pietronero +1
The properties of the galaxy distribution at large scales are usually studied using statistics which are assumed to be self-averaging inside a given sample. We present a new analys…
Extension and estimation of correlations in Cold Dark Matter models
Francesco Sylos Labini, Nickolay L. Vasilyev
We discuss the large scale properties of standard cold dark matter cosmological models characterizing the main features of the power-spectrum, of the two-point correlation function…
Power law correlations in galaxy distribution and finite volume effects from the Sloan Digital Sky Survey Data Release Four
Francesco Sylos Labini, Nickolay L. Vasilyev, Yurij V. Baryshev
We discuss the estimation of galaxy correlation properties in several volume limited samples, in different sky regions, obtained from the Fourth Data Release of the Sloan Digital S…
Linear perturbative theory of the discrete cosmological N-body problem
B. Marcos, T. Baertschiger, M. Joyce +2
We present a perturbative treatment of the evolution under their mutual self-gravity of particles displaced off an infinite perfect lattice, both for a static space and for a homog…
Gravitational Structure Formation
Francesco Sylos Labini, Thierry Baertschiger
We discuss the formation of the first structures in gravitational N-body simulations. The role of two-body interaction is found to be a crucial element and an analogy with the dyna…
Large scale correlations in galaxy clustering from the Two degree Field Galaxy Redshift Survey
N. L. Vasilyev, Yu. V. Baryshev, F. Sylos Labini
We study galaxy correlations from samples extracted from the 2dFGRS final release. Statistical properties are characterized by studying the nearest neighbor probability density, th…
The zero-crossing scale and the problem of galaxy bias
Francesco Sylos Labini
One of the main problems in the studies of large scale galaxy structures concerns the relation of the correlation properties of a certain population of objects with those of a sele…
Basic properties of galaxy clustering in the light of recent results from the Sloan Digital Sky Survey
M. Joyce, F. Sylos Labini, A. Gabrielli +2
We discuss some of the basic implications of recent results on galaxy correlations published by the SDSS collaboration. In particular we focus on the evidence which has been recent…
Statistical physics for complex cosmic structures
Luciano Pietronero, Francesco Sylos Labini
Cosmic structures at large scales represent the earliest and most extended form of matter condensation. In this lecture we review the application of the methods and concepts of mod…
The LEDA galaxy distribution: I. Maps of the Local Universe
Helene Courtois, Georges Paturel, Thierry Sousbie +1
In order to investigate the properties of large-scale structures of galaxies in the universe, we present an analysis of their spatial distribution at z0.033. We used the LEDA ex…
Growth of correlations in gravitational N-body simulations
Thierry Baertschiger, Francesco Sylos Labini
In the gravitational evolution of a cold infinite particle distribution, two-body interactions can be predominant at early times: we show that, by treating the simple case of a Poi…
Complexity in cosmic structures
Francesco Sylos Labini, Andrea Gabrielli
We discuss correlation properties of a general mass density field introducing a classification of structures based on their complexity. Standard cosmological models for primordial…
Reply to the comment on ''On the problem of initial conditions in cosmological N-body simulations''
Thierry Baertschiger, Francesco Sylos Labini
We reply to some comments in astro-ph/0309381 concerning the problem of setting-up initial conditions in cosmological N-body simulations
Gravitational force in weakly correlated particle distributions
Andrea Gabrielli, Adolfo Paolo Masucci, Francesco Sylos Labini
We study the statistics of the gravitational (Newtonian) force in a particular kind of weakly correlated distribution of point-like and unitary mass particles generated by the so-c…
Initial conditions, Discreteness and non-linear structure formation in cosmology
Francesco Sylos Labini, Thierry Baertschiger, Andrea Gabrielli +1
In this lecture we address three different but related aspects of the initial continuous fluctuation field in standard cosmological models. Firstly we discuss the properties of the…
Real space statistical properties of standard cosmological models
Andrea Gabrielli, Michael Joyce, Francesco Sylos Labini
After reviewing some basic relevant properties of stationary stochastic processes (SSP), we discuss the properties of the so-called Harrison-Zeldovich like spectra of mass density…
Generation of Primordial Cosmological Perturbations from Statistical Mechanical Models
A. Gabrielli, B. Jancovici, M. Joyce +3
The initial conditions describing seed fluctuations for the formation of structure in standard cosmological models, i.e.the Harrison-Zeldovich distribution, have very characteristi…
Universality of power law correlations in gravitational clustering
Francesco Sylos Labini, Thierry Baertschiger, Michael Joyce
We present an analysis of different sets of gravitational N-body simulations, all describing the dynamics of discrete particles with a small initial velocity dispersion. They encom…
Statistical Physics for Cosmic Structures
Luciano Pietronero, Andrea Gabrielli, Francesco Sylos Labini
Ideas of Statistical Physics are very relevant for cosmic structures especially considering that the field is undergoing a period of exceptional development with many new data appe…
The Glass-like Universe: Real-space correlation properties of standard cosmological models
Andrea Gabrielli, Michael Joyce, Francesco Sylos Labini
After reviewing the basic relevant properties of stationary stochastic processes (SSP), defining basic terms and quantities, we discuss the properties of the so-called Harrison-Zel…
On the problem of initial conditions in cosmological N-body simulations
Thierry Baertschiger, Francesco Sylos Labini
Cosmological N-body simulations aim to calculate the non-linear gravitational growth of structures via particle dynamics. A crucial problem concerns the setting-up of the initial p…