My astronomical/astrophysical research interests mainly center on:
Physical Cosmology
Cosmic Structure Formation
Large Scale Distribution of Galaxies
while I have a keen interest in various mathematical topics, in particular:
Stochastic Geometry (Voronoi & Delaunay tessellations, spatial point processes)
Stochastic Random Fields
Fascinated by the origin and structure of the Universe as well as by the nobility and
serenity of geometry I find it inspiring to see that the Universe in more than one way
resembles the Academia of Plato, that venerable institution
devoted to learning, seeking to uncover the secrets of the world and our
existence, over whose door it was said to be written
``Let no one unversed in geometry enter here ''
photograph: Rien van de Weygaert (Academia Platon, Athens, April 2001)
Over the past two decades we have witnessed a paradigm shift
in our perception of the Megaparsec scale structure in the Universe. As increasingly
elaborate galaxy redshift surveys charted ever larger regions in the nearby cosmos,
an intriguingly complex and salient
the Cosmic Foam
cosmic foamlike network appeared to permeate the observable Universe and has
established itself as a quintessential characteristic of the cosmic matter
and galaxy distribution. In addition, elaborate efforts have enabled us to
study the migration streams and dynamics involved in building up such structures.
Meanwhile, the primordial circumstances out of which these patterns and objects
have been evolving have been revealed by an array of Cosmic Microwave Background
experiments. Their detailed view of the pristine Universe has revolutionized
cosmology. Meanwhile, the intermediate eons of a youthful Universe have gradually
been disclosing ever more secrets as large telescopes, sensitive instruments
and sophisticated detectors have been leading the exploration of the high redshift Universe.
Step by step the various pieces of information -- yielded by radio, infrared, optical and
up to X-ray and gamma-ray frequency observations -- are assembling into a highly
versatile and elaborate picture of the evolution of our Cosmos. Within this
extensive context, the Megaparsec Universe has been functioning as a bedrock on
which a strong basic model and scenario of structure formation has been founded, based
upon the gravitational instability of the primordial matter
distribution.