Description: Phase Transitions in the Early Universe.- Elements of Baryogenesis.- Out of EquilibriumFields in Selfconsistent Inflationary Dynamics. Density Fluctuations.- Minimal String DrivenCosmology and its Predictions.- New Dual Relations BetweenQuantumField Theory and String Regimes in CurvedBackgrounds.- Detectabilityof Relic Squeezed Gravitational Wavesby Laser Interferometers.- Gravitational Field and Its Energy-Momentum Tensor.- Observations and Theory of The Cosmic Microwave Background.- The 1+3 Covariant Approach to CMB Anisotropies. Erice lectures 1999.- Some Problems of the CMB Polarization.- The High Redshift Radio Universe.- In Search of the Early Universe. I. The Oldest Stars.- In Search of the Early Universe. II. The Youngest Galaxies.- Clusters of Galaxies and the Large Scale Structure.- Structure Formation of Galaxy Clusters and Beyond.- Warm Dark Matter. Clues to Primordial Phase Density from the Structure of Galaxy Halos.- Dark Matter as Determined from Energetic Particles.- Fractal Lacunarity and Scenarios for the Near-Isotropic Distribution of Galaxies.- Fractal Structures and the Large Scale Distribution of Galaxies.- The Cosmological Many-Body Problem and Some of its Observational Implications.- The Statistical Mechanics of the Self-Gravitating Gas: Equation of State and Fractal Dimension.- Renormalization Group Flow and Fragmentation in the Self-Gravitating Thermal Gas.- Bepposax: 3 Years of Operation. Highlights and Significant Results 483.- The Extreme Energy Cosmic Rays and Cosmic Neutrinos as Probes for the Distant Universe. Astrophysics Involved and Experimental Approach. 499.- Origin and Physics of the Highest Energy Particles in the Universe SIS.- The Gamma-Ray Bursts and the SWIFT Mission.- Neutrino Oscillations and Cosmology.- High Energy NeutrinoAstronomy: Towards Kilometer-Scale Detectors.- Accretion of Gas onto Black Holes.- Mass Extinctions of Species -- Were Dinosaurs Killed by an Asteroid or Volcanoes?.- Opening the Third Millennium.- Photographs of the Institute.- Author Index.

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