TY  - BOOK
AU  - Müller,Reto
AU  - Müller,Reto
TI  - Differential Harnack Inequalities and the Ricci Flow
T2  - EMS Series of Lectures in Mathematics (ELM)
SN  - 9783037195307
PY  - 2006///
CY  - Zuerich, Switzerland
PB  - European Mathematical Society Publishing House
KW  - Differential & Riemannian geometry
KW  - bicssc
KW  - Differential equations
KW  - Global analysis, analysis on manifolds
KW  - msc
KW  - Partial differential equations
KW  - Differential geometry
N1  - Restricted to subscribers
N2  - The classical Harnack inequalities play an important role in the  study of parabolic partial differential equations. The idea of  finding a differential version of such a classical Harnack  inequality goes back to Peter Li and Shing Tung Yau, who introduced  a pointwise gradient estimate for a solution of the linear heat  equation on a manifold which leads to a classical Harnack type  inequality if being integrated along a path. Their idea has been  successfully adopted and generalized to (nonlinear) geometric heat  flows such as mean curvature flow or Ricci flow; most of this work  was done by Richard Hamilton. In 2002, Grisha Perelman presented a  new kind of differential Harnack inequality which involves both the  (adjoint) linear heat equation and the Ricci flow. This led to a  completely new approach to the Ricci flow that allowed  interpretation as a gradient flow which maximizes different entropy  functionals. This approach forms the main analytic core of Perelman's  attempt to prove the Poincaré conjecture. It is, however, of  completely independent interest and may as well prove useful in various  other areas, such as, for instance, the theory of Kähler manifolds.    The goal of this book is to explain this analytic tool in full  detail for the two examples of the linear heat equation and the  Ricci flow. It begins with the original Li–Yau result, presents  Hamilton's Harnack inequalities for the Ricci flow, and ends with  Perelman's entropy formulas and space-time geodesics.    The text is a self-contained, modern introduction to the Ricci flow  and the analytic methods to study it. It is primarily addressed to  students who have a basic introductory knowledge of analysis and of  Riemannian geometry and who are attracted to further study in  geometric analysis. No previous knowledge of differential Harnack  inequalities or the Ricci flow is required
UR  - https://doi.org/10.4171/030
UR  - http://www.ems-ph.org/img/books/mueller_mini.jpg
ER  -