This volume collects the notes of the CIME course Nonlinear PDE's and
applications held in Cetraro (Italy) on June 23-28, 2008. It consists of
four series of lectures, delivered by Stefano Bianchini (SISSA,
Trieste), Eric A. Carlen (Rutgers University), Alexander Mielke (WIAS,
Berlin), and Cédric Villani (Ecole Normale Superieure de Lyon). They
presented a broad overview of far-reaching findings and exciting new
developments concerning, in particular, optimal transport theory,
nonlinear evolution equations, functional inequalities, and differential
geometry. A sampling of the main topics considered here includes optimal
transport, Hamilton-Jacobi equations, Riemannian geometry, and their
links with sharp geometric/functional inequalities, variational methods
for studying nonlinear evolution equations and their scaling properties,
and the metric/energetic theory of gradient flows and of
rate-independent evolution problems. The book explores the fundamental
connections between all of these topics and points to new research
directions in contributions by leading experts in these fields.