Institute for Complex Systems - Sapienza - CNR

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ISC Sapienza Statistical Gravitation and Cosmology

Statistical Gravitation and Cosmology

Application of statistical physics to gravitation and cosmology. 

Publications >>

 

Matter density fields in the early universe

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The most prominent feature of the initial conditions of the matter spatial distribution in the early universe, in standard theoretical models, derived from inflationary mechanisms, is that matter density field presents on large scale super-homogeneous features. This means the following. If one considers the paradigm of uniform distributions, the Poisson process where particles are placed completely randomly in space, the mass fluctuations in a sphere of radius R growths as the volume of the sphere.

Last Updated on Thursday, 03 March 2011 11:17 Read more...

Total gravitational force and the classification of long range interactions

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In equilibrium statistical mechanics the distinction between short and long range interactions is given by the integrability or not of the pair potential. However for what concerns only the clustering dynamics of a particle distribution under the effect of an attractive pair interaction, it seems by recent works that the distinction is given by the integrability of the pair force instead of the potential.

Last Updated on Thursday, 03 March 2011 11:17 Read more...

Dynamics of self-gravitating systems

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A System with long-range interactions is characterized by an inter-particle potential which decays at large distances with a power law exponent which is smaller than the dimension of the embedding space. Classical examples include for instance: self-gravitating systems, unscreened Coulomb systems, ion beams, wave-particle systems of relevance to plasma physics and others.

Last Updated on Thursday, 03 March 2011 11:17 Read more...

GZIP: Galaxy morphology classification by zip algorithm

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Even before the identification of galaxies as stellar systems, astronomers have classified them based on their visual appearance. Galaxies in the local universe can organized in a sequence of morphologies (e.g. the Hubble sequence) which must be the result of the specific processes that originated them.

Last Updated on Thursday, 03 March 2011 11:17 Read more...

Globular Cluster Dynamics

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Tidal tail characterization:

Introduction:

A globular cluster (GC) is a spherical collection of stars that orbits a galactic core as a satellite.
Globular clusters are very tightly bound by gravity, which gives them their spherical shapes and relatively high stellar densities toward their centers. The name of this category of star cluster is derived from the Latin globulus—a small sphere. Globular clusters are fairly common; there are about 158 currently known globular clusters in the Milky Way, with perhaps 10–20 more undiscovered.

Last Updated on Wednesday, 24 October 2012 11:04 Read more...