In the last few years modified gravity theories have been proposed as extensions of Einstein's
theory of gravity. Their main motivation is to explain the latest cosmological and
astrophysical data on dark energy and dark matter. The study of general relativity at small
scales has already produced important results (cf e.g. LNP 863 Quantum Gravity and Quantum
Cosmology) while its study at large scales is challenging because recent and upcoming
observational results will provide important information on the validity of these modified
theories. In this volume various aspects of modified gravity at large scales will be
discussed: high-curvature gravity theories general scalar-tensor theories Galileon theories
and their cosmological applications F(R) gravity theories massive new massive and
topologically massive gravity Chern-Simons modifications of general relativity (including
holographic variants) and higher-spin gravity theories to name but a few of the most important
recent developments. Edited and authored by leading researchers in the field and cast into the
form of a multi-author textbook at postgraduate level this volume will be of benefit to all
postgraduate students and newcomers from neighboring disciplines wishing to find a
comprehensive guide for their future research.