118 citations · 893 across the 39 of their papers we have counts for
15 papers · 1 filter
Scaling Laws in the Cosmic Structure and Renormalization Group
Jose Gaite, Alvaro Dominguez
There is evidence of a scale-invariant matter distribution up to scales over 10 Megaparsecs. We review scaling (fractal or multifractal) models of large scale structure and their o…
Hydrodynamic Approach to the Evolution of Cosmic Structures II: Study of N-body Simulations at z=0
Alexander Knebe, Alvaro Dominguez, Rosa Dominguez-Tenreiro
We present a series of cosmological N-body simulations which make use of the hydrodynamic approach to the evolution of structures (Dominguez 2000). This approach addresses explicit…
Adhesive Gravitational Clustering
Thomas Buchert, Alvaro Dominguez
The notion of `adhesion' has been advanced for the phenomenon of stabilization of large-scale structure emerging from gravitational instability of a cold medium. Recently, the phys…
Numerical study of the cosmological velocity field as a function of density
Alvaro Dominguez, Adrian L. Melott
We report on a new study of the velocity distribution in N-body simulations. We investigate the center-of-mass and internal kinetic energies of coarsening cells as a function of ti…
Comment on ''On the problem of initial conditions in cosmological N-body simulations'' (Europhys. Lett. 57, 322)
Alvaro Dominguez, Alexander Knebe
In astro-ph/0109199, the initial conditions (IC's) of cosmological N-body simulations by the Virgo Consortium are analyzed and it is concluded that the density fluctuations are rat…
On the reliability of initial conditions for dissipationless cosmological simulations
Alexander Knebe, Alvaro Dominguez
We present the study of ten random realizations of a density field characterized by a cosmological power spectrum P(k) at redshift z=50. The reliability of such initial conditions…
Influence of the cosmological expansion on small systems
Alvaro Dominguez, Jose Gaite
The effect of the large-scale cosmological expansion on small systems is studied in the light of modern cosmological models of large-scale structure. We identify certain assumption…
Study of corrections to the dust model via perturbation theory
Alvaro Dominguez
This work reports on the application of the Eulerian perturbation theory to a recently proposed model of cosmological structure formation by gravitational instability (astro-ph/000…
Velocity dispersion in N-body simulations of CDM models
Alvaro Dominguez
This work reports on a study of the spatially coarse-grained velocity dispersion in cosmological N-body simulations (OCDM and Lambda-CDM models) as a function of time (redshifts z=…
Morphology of the large-scale structure
Alvaro Dominguez
The Minkowski functionals are a mathematical tool to quantify morphological features of patterns. Some applications to the matter distribution in galaxy catalogues and N-body simul…
Hydrodynamic approach to the evolution of cosmological structures
Alvaro Dominguez
A hydrodynamic formulation of the evolution of large-scale structure in the Universe is presented. It relies on the spatially coarse-grained description of the dynamical evolution…
Dynamical Scaling of Matter Density Correlations in the Universe: an Application of the Dynamical Renormalization Group
A. Dominguez, D. Hochberg, J. M. Martin-Garcia +2
We show how the interplay of non-linear dynamics, self-gravity, and fluctuations leads to self-affine behavior of matter density correlations quite generically, i.e., with a power-…
The fractal distribution of galaxies and the transition to homogeneity
Jose Gaite, Alvaro Dominguez, Juan Perez-Mercader
There is an ongoing debate in cosmology about the value of the length scale at which ``homogeneity'' in the matter distribution is reached or even if such a scale exists. In the wa…
Extending the scope of models for large-scale structure formation in the Universe
Thomas Buchert, Alvaro Dominguez, Juan Perez-Mercader
We propose a phenomenological generalization of the models of large-scale structure formation in the Universe by gravitational instability in two ways: we include pressure forces t…
Modeling multi-stream flow in collisionless matter: approximations for large-scale structure beyond shell-crossing
Thomas Buchert, Alvaro Dominguez
The generally held view that a model of large-scale structure, formed by collisionless matter in the Universe, can be based on the matter model ``dust'' fails in the presence of mu…