269 citations · 2.2k across the 103 of their papers we have counts for
26 papers · 1 filter
Large-Scale Galaxy Correlations from the DESI First Data Release
Francesco Sylos Labini, Tibor Antal
We quantify galaxy correlations using two distinct three-dimensional samples from the first data release of the Dark Energy Spectroscopic Instrument (DESI): the Bright Galaxy Sampl…
The Hidden Role of Anisotropies in Shaping Structure Formation in Cosmological N-Body Simulations
Francesco Sylos Labini
Initial conditions in cosmological -body simulations are typically generated by displacing particles from a regular cubic lattice using a correlated field derived from the linea…
Testing growth rate dependence in cosmological perturbation theory using scale-free models
Azrul Pohan, Michael Joyce, David Benhaiem +1
We generalize previously derived analytic results for the one-loop power spectrum (PS) in scale-free models (with linear PS ) to a broader class of such models in…
Comment on "A fractal LTB model cannot explain Dark Energy''
Leonardo Cosmai, Giuseppe Fanizza, Francesco Sylos Labini +2
We reply to the criticisms moved in [1] against our results presented in [2]. In particular, we show that our fractal model has none of the problems claimed in [1]. The latters can…
Gravitational collapse from cold uniform asymmetric initial conditions
Francesco Sylos Labini, Michael Joyce
Using controlled numerical N-body experiments, we show how, in the collapse dynamics of an initially cold and uniform distribution of particles with a generic asymmetric shape, fin…
Zipf's law for cosmic structures: how large are the greatest structures in the universe?
Giordano De Marzo, Francesco Sylos Labini, Luciano Pietronero
The statistical characterization of the distribution of visible matter in the universe is a central problem in modern cosmology. In this respect, a crucial question still lacking a…
Fractal universe and cosmic acceleration in a Lemaître-Tolman-Bondi scenario
Leonardo Cosmai, Giuseppe Fanizza, Francesco Sylos Labini +2
In this paper we attempt to answer to the question: can cosmic acceleration of the Universe have a fractal solution? We give an exact solution of a Lemaître-Tolman-Bondi (LTB) Univ…
Particle number dependence in the non-linear evolution of N-body self-gravitating systems
David Benhaiem, Michael Joyce, Francesco Sylos Labini +1
Simulations of purely self-gravitating N-body systems are often used in astrophysics and cosmology to study the collisionless limit of such systems. Their results for macroscopic q…
Stable clustering and the resolution of dissipationless cosmological N-body simulations
David Benhaiem, Michael Joyce, Francesco Sylos Labini
The determination of the resolution of cosmological N-body simulations, i.e., the range of scales in which quantities measured in them represent accurately the continuum limit, is…
Spatial density fluctuations and selection effects in galaxy redshift surveys
Francesco Sylos Labini, Daniil Tekhanovich, Yurij V. Baryshev
One of the main problems of observational cosmology is to determine the range in which a reliable measurement of galaxy correlations is possible. This corresponds to determine the…
A toy model to test the accuracy of cosmological N-body simulations
Francesco Sylos Labini
The evolution of an isolated over-density represents a useful toy model to test the accuracy of a cosmological N-body code in the non linear regime as it is approximately equivalen…
Evolution of isolated overdensities as a control on cosmological N body simulations
Michael Joyce, Francesco Sylos Labini
Beyond convergence studies and comparison of different codes, there are essentially no controls on the accuracy in the non-linear regime of cosmological N body simulations, even in…
Universal properties of violently relaxed gravitational structures
Francesco Sylos Labini
We study the collapse and virialization of an isolated spherical cloud of self-gravitating particles initially at rest and characterised by a power-law density profile, with expone…
Violent and mild relaxation of an isolated self-gravitating uniform and spherical cloud of particles
Francesco Sylos Labini
The collapse of an isolated, uniform and spherical cloud of self-gravitating particles represents a paradigmatic example of a relaxation process leading to the formation of a quasi…
Very large scale correlations in the galaxy distribution
Francesco Sylos Labini
We characterize galaxy correlations in the Sloan Digital Sky Survey by measuring several moments of galaxy counts in spheres. We firstly find that the average counts grows as a pow…
Inhomogeneities in the universe
Francesco Sylos Labini
Standard models of galaxy formation predict that matter distribution is statistically homogeneous and isotropic and characterized by (i) spatial homogeneity for r<10 Mpc/h, (ii) sm…
Breaking of self-averaging properties and selection effects in the Luminous Red Galaxies sample
Francesco Sylos Labini
We study the statistical properties of the Luminous Red Galaxies sample from the Sloan Digital Sky Survey. In particular we test, by determining the probability density function (P…
Cold uniform spherical collapse revisited
M. Joyce, B. Marcos, F. Sylos Labini
We report results of a study of the Newtonian dynamics of N self-gravitating particles which start in a quasi-uniform spherical configuration, without initial velocities. These ini…
Gravitational fluctuations of the galaxy distribution
Francesco Sylos Labini
We study the statistical properties of the gravitational field generated by galaxy distribution observed bythe Sloan Digital Sky Survey (DR7). We characterize the probability densi…
Testing the Copernican and Cosmological Principles in the local universe with galaxy surveys
Francesco Sylos Labini, Yuri V. Baryshev
Cosmological density fields are assumed to be translational and rotational invariant, avoiding any special point or direction, thus satisfying the Copernican Principle. A spatially…
Absence of significant cross-correlation between WMAP and SDSS
M. Lopez-Corredoira, F. Sylos Labini, J. Betancort-Rijo
AIMS. Several authors have claimed to detect a significant cross-correlation between microwave WMAP anisotropies and the SDSS galaxy distribution. We repeat these analyses to deter…
Super-homogeneity and inhomogeneities in the large scale matter distribution
Francesco Sylos Labini
Super-homogeneity is a property that is supposed to be satisfied by matter fluctuations in all standard theoretical models of structure formation, such as LCDM and its variants. Th…
Characterizing the large scale inhomogeneity of the galaxy distribution
Francesco Sylos Labini
In order to investigate whether galaxy structures are compatible with the predictions of the standard LCDM cosmology, we focus here on the analysis of several simple and basic stat…
Breaking the self-averaging properties of spatial galaxy fluctuations in the Sloan Digital Sky Survey - Data Release Six
Francesco Sylos Labini, Nikolay L. Vasilyev, Yurij V. Baryshev
Statistical analyses of finite sample distributions usually assume that fluctuations are self-averaging, i.e. that they are statistically similar in different regions of the given…