edited by Ignazio Ciufolini (Universitá di Lecce, Italy) , Daniele Dominici (Università di Firenze, Italy) , & Luca Lusanna (INFN-Firenze, Italy)

This volume offers a comprehensive overview of our understanding of gravity at both the experimental and the theoretical level. Critical reviews by experts cover topics ranging from astrophysics (anisotropies in the cosmic microwave background, gamma ray bursts, neutron stars and astroparticles), cosmology, the status of gravitational wave sources and detectors, verification of Newton's law at short distances, the equivalence principle, gravito-magnetism, measurement theory, time machines and the foundations of Einstein's theory, to string theory and loop quantum gravity.

• Foundations and Classical General Relativity:
  • Space–Time, General Covariance, Dirac–Bergmann Observables and Non-Inertial Frames (L Lusanna)
  • Physics in the Presence of a Time Machine (I D Novikov)
  • Frame-Dragging and Gravitomagnetism: Theory and Experiment (I Ciufolini)
  • New Tests of the Strong Equivalence Principle and of the Inverse Square Law (E G Adelberger)
• Cosmology:
  • The Inflationary Universe (A Riotto)
  • Imaging the Early Universe with the BOOMERANG Experiment (P De Bernardis et al.)
• Gravitational Waves:
  • Gravitational Radiation: A Tool for Testing General Relativity (C M Will)
  • What Gravitational Signals Say about the Structure and the Evolution of Astrophysical Sources (V Ferrari)
• Astrophysics:
  • Computational Relativity: Collisions of Black Holes (R Matzner)
  • Gamma Ray Bursts: Some Facts and Ideas (G Ghisellini)
• Quantum Gravity:
  • Spin Foams as Feynman Diagrams (M Reisenberger & C Rovelli)
  • Physics with Large Extra Dimensions (I Antoniadis)
  • Field Theories on Canonical and Lie-Algebra Noncommutative Spacetimes (G Amelino-Camelia et al.)
  • and other papers