This is the second edition of a well-received book that is a modern,
self-contained introduction to the theory of gravitational interactions.
The new edition includes more details on gravitational waves of
cosmological origin, the so-called brane world scenario, and
gravitational time-delay effects.The first part of the book follows the
traditional presentation of general relativity as a geometric theory of
the macroscopic gravitational field, while the second, more advanced
part discusses the deep analogies (and differences) between a geometric
theory of gravity and the gauge theories of the other fundamental
interactions. This fills a gap within the traditional approach to
general relativity which usually leaves students puzzled about the role
of gravity. The required notions of differential geometry are reduced to
the minimum, allowing room for aspects of gravitational physics of
current phenomenological and theoretical interest, such as the
properties of gravitational waves, the gravitational interactions of
spinors, and the supersymmetric and higher-dimensional generalization of
the Einstein equations. This textbook is primarily intended for students
pursuing a theoretical or astroparticle curriculum but is also relevant
for PhD students and young researchers.